MDEV-20487 Set innodb_adaptive_hash_index=OFF by default
Based on the performance testing that was conducted in MDEV-17492,
the InnoDB adaptive hash index could only help performance in specific,
almost-read-only workloads. It could slow down all kinds of workloads
(especially DROP TABLE, TRUNCATE TABLE, ALTER TABLE, or DROP INDEX
operations), and it can become corrupted, causing crashes (such as
MDEV-18815, MDEV-20203) and possibly data corruption. Furthermore,
the adaptive hash index consumes space from the InnoDB buffer pool,
which could hurt performance when the working set would almost fit
in the buffer pool.
Given all this, it is best to disable the adaptive hash index by default.
6 years ago MDEV-20487 Set innodb_adaptive_hash_index=OFF by default
Based on the performance testing that was conducted in MDEV-17492,
the InnoDB adaptive hash index could only help performance in specific,
almost-read-only workloads. It could slow down all kinds of workloads
(especially DROP TABLE, TRUNCATE TABLE, ALTER TABLE, or DROP INDEX
operations), and it can become corrupted, causing crashes (such as
MDEV-18815, MDEV-20203) and possibly data corruption. Furthermore,
the adaptive hash index consumes space from the InnoDB buffer pool,
which could hurt performance when the working set would almost fit
in the buffer pool.
Given all this, it is best to disable the adaptive hash index by default.
6 years ago  MDEV-12026: Implement innodb_checksum_algorithm=full_crc32
MariaDB data-at-rest encryption (innodb_encrypt_tables)
had repurposed the same unused data field that was repurposed
in MySQL 5.7 (and MariaDB 10.2) for the Split Sequence Number (SSN)
field of SPATIAL INDEX. Because of this, MariaDB was unable to
support encryption on SPATIAL INDEX pages.
Furthermore, InnoDB page checksums skipped some bytes, and there
are multiple variations and checksum algorithms. By default,
InnoDB accepts all variations of all algorithms that ever existed.
This unnecessarily weakens the page checksums.
We hereby introduce two more innodb_checksum_algorithm variants
(full_crc32, strict_full_crc32) that are special in a way:
When either setting is active, newly created data files will
carry a flag (fil_space_t::full_crc32()) that indicates that
all pages of the file will use a full CRC-32C checksum over the
entire page contents (excluding the bytes where the checksum
is stored, at the very end of the page). Such files will always
use that checksum, no matter what the parameter
innodb_checksum_algorithm is assigned to.
For old files, the old checksum algorithms will continue to be
used. The value strict_full_crc32 will be equivalent to strict_crc32
and the value full_crc32 will be equivalent to crc32.
ROW_FORMAT=COMPRESSED tables will only use the old format.
These tables do not support new features, such as larger
innodb_page_size or instant ADD/DROP COLUMN. They may be
deprecated in the future. We do not want an unnecessary
file format change for them.
The new full_crc32() format also cleans up the MariaDB tablespace
flags. We will reserve flags to store the page_compressed
compression algorithm, and to store the compressed payload length,
so that checksum can be computed over the compressed (and
possibly encrypted) stream and can be validated without
decrypting or decompressing the page.
In the full_crc32 format, there no longer are separate before-encryption
and after-encryption checksums for pages. The single checksum is
computed on the page contents that is written to the file.
We do not make the new algorithm the default for two reasons.
First, MariaDB 10.4.2 was a beta release, and the default values
of parameters should not change after beta. Second, we did not
yet implement the full_crc32 format for page_compressed pages.
This will be fixed in MDEV-18644.
This is joint work with Marko Mäkelä.
7 years ago MDEV-12026: Implement innodb_checksum_algorithm=full_crc32
MariaDB data-at-rest encryption (innodb_encrypt_tables)
had repurposed the same unused data field that was repurposed
in MySQL 5.7 (and MariaDB 10.2) for the Split Sequence Number (SSN)
field of SPATIAL INDEX. Because of this, MariaDB was unable to
support encryption on SPATIAL INDEX pages.
Furthermore, InnoDB page checksums skipped some bytes, and there
are multiple variations and checksum algorithms. By default,
InnoDB accepts all variations of all algorithms that ever existed.
This unnecessarily weakens the page checksums.
We hereby introduce two more innodb_checksum_algorithm variants
(full_crc32, strict_full_crc32) that are special in a way:
When either setting is active, newly created data files will
carry a flag (fil_space_t::full_crc32()) that indicates that
all pages of the file will use a full CRC-32C checksum over the
entire page contents (excluding the bytes where the checksum
is stored, at the very end of the page). Such files will always
use that checksum, no matter what the parameter
innodb_checksum_algorithm is assigned to.
For old files, the old checksum algorithms will continue to be
used. The value strict_full_crc32 will be equivalent to strict_crc32
and the value full_crc32 will be equivalent to crc32.
ROW_FORMAT=COMPRESSED tables will only use the old format.
These tables do not support new features, such as larger
innodb_page_size or instant ADD/DROP COLUMN. They may be
deprecated in the future. We do not want an unnecessary
file format change for them.
The new full_crc32() format also cleans up the MariaDB tablespace
flags. We will reserve flags to store the page_compressed
compression algorithm, and to store the compressed payload length,
so that checksum can be computed over the compressed (and
possibly encrypted) stream and can be validated without
decrypting or decompressing the page.
In the full_crc32 format, there no longer are separate before-encryption
and after-encryption checksums for pages. The single checksum is
computed on the page contents that is written to the file.
We do not make the new algorithm the default for two reasons.
First, MariaDB 10.4.2 was a beta release, and the default values
of parameters should not change after beta. Second, we did not
yet implement the full_crc32 format for page_compressed pages.
This will be fixed in MDEV-18644.
This is joint work with Marko Mäkelä.
7 years ago  MDEV-11556 InnoDB redo log apply fails to adjust data file sizes
fil_space_t::recv_size: New member: recovered tablespace size in pages;
0 if no size change was read from the redo log,
or if the size change was implemented.
fil_space_set_recv_size(): New function for setting space->recv_size.
innodb_data_file_size_debug: A debug parameter for setting the system
tablespace size in recovery even when the redo log does not contain
any size changes. It is hard to write a small test case that would
cause the system tablespace to be extended at the critical moment.
recv_parse_log_rec(): Note those tablespaces whose size is being changed
by the redo log, by invoking fil_space_set_recv_size().
innobase_init(): Correct an error message, and do not require a larger
innodb_buffer_pool_size when starting up with a smaller innodb_page_size.
innobase_start_or_create_for_mysql(): Allow startup with any initial
size of the ibdata1 file if the autoextend attribute is set. Require
the minimum size of fixed-size system tablespaces to be 640 pages,
not 10 megabytes. Implement innodb_data_file_size_debug.
open_or_create_data_files(): Round the system tablespace size down
to pages, not to full megabytes, (Our test truncates the system
tablespace to more than 800 pages with innodb_page_size=4k.
InnoDB should not imagine that it was truncated to 768 pages
and then overwrite good pages in the tablespace.)
fil_flush_low(): Refactored from fil_flush().
fil_space_extend_must_retry(): Refactored from
fil_extend_space_to_desired_size().
fil_mutex_enter_and_prepare_for_io(): Extend the tablespace if
fil_space_set_recv_size() was called.
The test case has been successfully run with all the
innodb_page_size values 4k, 8k, 16k, 32k, 64k.
9 years ago MDEV-11556 InnoDB redo log apply fails to adjust data file sizes
fil_space_t::recv_size: New member: recovered tablespace size in pages;
0 if no size change was read from the redo log,
or if the size change was implemented.
fil_space_set_recv_size(): New function for setting space->recv_size.
innodb_data_file_size_debug: A debug parameter for setting the system
tablespace size in recovery even when the redo log does not contain
any size changes. It is hard to write a small test case that would
cause the system tablespace to be extended at the critical moment.
recv_parse_log_rec(): Note those tablespaces whose size is being changed
by the redo log, by invoking fil_space_set_recv_size().
innobase_init(): Correct an error message, and do not require a larger
innodb_buffer_pool_size when starting up with a smaller innodb_page_size.
innobase_start_or_create_for_mysql(): Allow startup with any initial
size of the ibdata1 file if the autoextend attribute is set. Require
the minimum size of fixed-size system tablespaces to be 640 pages,
not 10 megabytes. Implement innodb_data_file_size_debug.
open_or_create_data_files(): Round the system tablespace size down
to pages, not to full megabytes, (Our test truncates the system
tablespace to more than 800 pages with innodb_page_size=4k.
InnoDB should not imagine that it was truncated to 768 pages
and then overwrite good pages in the tablespace.)
fil_flush_low(): Refactored from fil_flush().
fil_space_extend_must_retry(): Refactored from
fil_extend_space_to_desired_size().
fil_mutex_enter_and_prepare_for_io(): Extend the tablespace if
fil_space_set_recv_size() was called.
The test case has been successfully run with all the
innodb_page_size values 4k, 8k, 16k, 32k, 64k.
9 years ago MDEV-19514 Defer change buffer merge until pages are requested
We will remove the InnoDB background operation of merging buffered
changes to secondary index leaf pages. Changes will only be merged as a
result of an operation that accesses a secondary index leaf page,
such as a SQL statement that performs a lookup via that index,
or is modifying the index. Also ROLLBACK and some background operations,
such as purging the history of committed transactions, or computing
index cardinality statistics, can cause change buffer merge.
Encryption key rotation will not perform change buffer merge.
The motivation of this change is to simplify the I/O logic and to
allow crash recovery to happen in the background (MDEV-14481).
We also hope that this will reduce the number of "mystery" crashes
due to corrupted data. Because change buffer merge will typically
take place as a result of executing SQL statements, there should be
a clearer connection between the crash and the SQL statements that
were executed when the server crashed.
In many cases, a slight performance improvement was observed.
This is joint work with Thirunarayanan Balathandayuthapani
and was tested by Axel Schwenke and Matthias Leich.
The InnoDB monitor counter innodb_ibuf_merge_usec will be removed.
On slow shutdown (innodb_fast_shutdown=0), we will continue to
merge all buffered changes (and purge all undo log history).
Two InnoDB configuration parameters will be changed as follows:
innodb_disable_background_merge: Removed.
This parameter existed only in debug builds.
All change buffer merges will use synchronous reads.
innodb_force_recovery will be changed as follows:
* innodb_force_recovery=4 will be the same as innodb_force_recovery=3
(the change buffer merge cannot be disabled; it can only happen as
a result of an operation that accesses a secondary index leaf page).
The option used to be capable of corrupting secondary index leaf pages.
Now that capability is removed, and innodb_force_recovery=4 becomes 'safe'.
* innodb_force_recovery=5 (which essentially hard-wires
SET GLOBAL TRANSACTION ISOLATION LEVEL READ UNCOMMITTED)
becomes safe to use. Bogus data can be returned to SQL, but
persistent InnoDB data files will not be corrupted further.
* innodb_force_recovery=6 (ignore the redo log files)
will be the only option that can potentially cause
persistent corruption of InnoDB data files.
Code changes:
buf_page_t::ibuf_exist: New flag, to indicate whether buffered
changes exist for a buffer pool page. Pages with pending changes
can be returned by buf_page_get_gen(). Previously, the changes
were always merged inside buf_page_get_gen() if needed.
ibuf_page_exists(const buf_page_t&): Check if a buffered changes
exist for an X-latched or read-fixed page.
buf_page_get_gen(): Add the parameter allow_ibuf_merge=false.
All callers that know that they may be accessing a secondary index
leaf page must pass this parameter as allow_ibuf_merge=true,
unless it does not matter for that caller whether all buffered
changes have been applied. Assert that whenever allow_ibuf_merge
holds, the page actually is a leaf page. Attempt change buffer
merge only to secondary B-tree index leaf pages.
btr_block_get(): Add parameter 'bool merge'.
All callers of btr_block_get() should know whether the page could be
a secondary index leaf page. If it is not, we should avoid consulting
the change buffer bitmap to even consider a merge. This is the main
interface to requesting index pages from the buffer pool.
ibuf_merge_or_delete_for_page(), recv_recover_page(): Replace
buf_page_get_known_nowait() with much simpler logic, because
it is now guaranteed that that the block is x-latched or read-fixed.
mlog_init_t::mark_ibuf_exist(): Renamed from mlog_init_t::ibuf_merge().
On crash recovery, we will no longer merge any buffered changes
for the pages that we read into the buffer pool during the last batch
of applying log records.
buf_page_get_gen_known_nowait(), BUF_MAKE_YOUNG, BUF_KEEP_OLD: Remove.
btr_search_guess_on_hash(): Merge buf_page_get_gen_known_nowait()
to its only remaining caller.
buf_page_make_young_if_needed(): Define as an inline function.
Add the parameter buf_pool.
buf_page_peek_if_young(), buf_page_peek_if_too_old(): Add the
parameter buf_pool.
fil_space_validate_for_mtr_commit(): Remove a bogus comment
about background merge of the change buffer.
btr_cur_open_at_rnd_pos_func(), btr_cur_search_to_nth_level_func(),
btr_cur_open_at_index_side_func(): Use narrower data types and scopes.
ibuf_read_merge_pages(): Replaces buf_read_ibuf_merge_pages().
Merge the change buffer by invoking buf_page_get_gen().
6 years ago |
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select VARIABLE_NAME, SESSION_VALUE, DEFAULT_VALUE, VARIABLE_SCOPE, VARIABLE_TYPE, VARIABLE_COMMENT, NUMERIC_MIN_VALUE, NUMERIC_MAX_VALUE, NUMERIC_BLOCK_SIZE, ENUM_VALUE_LIST, READ_ONLY, COMMAND_LINE_ARGUMENT from information_schema.system_variableswhere variable_name like 'innodb%' andvariable_name not in ('innodb_version', # always the same as the server version'innodb_disallow_writes', # only available WITH_WSREP'innodb_numa_interleave', # only available WITH_NUMA'innodb_sched_priority_cleaner', # linux only'innodb_evict_tables_on_commit_debug', # one may want to override this'innodb_use_native_aio', # default value depends on OS'innodb_buffer_pool_load_pages_abort') # debug build only, and is only for testingorder by variable_name;VARIABLE_NAME INNODB_ADAPTIVE_FLUSHINGSESSION_VALUE NULLDEFAULT_VALUE ONVARIABLE_SCOPE GLOBALVARIABLE_TYPE BOOLEANVARIABLE_COMMENT Attempt flushing dirty pages to avoid IO bursts at checkpoints.NUMERIC_MIN_VALUE NULLNUMERIC_MAX_VALUE NULLNUMERIC_BLOCK_SIZE NULLENUM_VALUE_LIST OFF,ONREAD_ONLY NOCOMMAND_LINE_ARGUMENT NONEVARIABLE_NAME INNODB_ADAPTIVE_FLUSHING_LWMSESSION_VALUE NULLDEFAULT_VALUE 10.000000VARIABLE_SCOPE GLOBALVARIABLE_TYPE DOUBLEVARIABLE_COMMENT Percentage of log capacity below which no adaptive flushing happens.NUMERIC_MIN_VALUE 0NUMERIC_MAX_VALUE 70NUMERIC_BLOCK_SIZE NULLENUM_VALUE_LIST NULLREAD_ONLY NOCOMMAND_LINE_ARGUMENT REQUIREDVARIABLE_NAME INNODB_ADAPTIVE_HASH_INDEXSESSION_VALUE NULLDEFAULT_VALUE OFFVARIABLE_SCOPE GLOBALVARIABLE_TYPE BOOLEANVARIABLE_COMMENT Enable InnoDB adaptive hash index (disabled by default).NUMERIC_MIN_VALUE NULLNUMERIC_MAX_VALUE NULLNUMERIC_BLOCK_SIZE NULLENUM_VALUE_LIST OFF,ONREAD_ONLY NOCOMMAND_LINE_ARGUMENT OPTIONALVARIABLE_NAME INNODB_ADAPTIVE_HASH_INDEX_PARTSSESSION_VALUE NULLDEFAULT_VALUE 8VARIABLE_SCOPE GLOBALVARIABLE_TYPE BIGINT UNSIGNEDVARIABLE_COMMENT Number of InnoDB Adaptive Hash Index Partitions (default 8)NUMERIC_MIN_VALUE 1NUMERIC_MAX_VALUE 512NUMERIC_BLOCK_SIZE 0ENUM_VALUE_LIST NULLREAD_ONLY YESCOMMAND_LINE_ARGUMENT OPTIONALVARIABLE_NAME INNODB_ADAPTIVE_MAX_SLEEP_DELAYSESSION_VALUE NULLDEFAULT_VALUE 150000VARIABLE_SCOPE GLOBALVARIABLE_TYPE BIGINT UNSIGNEDVARIABLE_COMMENT The upper limit of the sleep delay in usec. Value of 0 disables it.NUMERIC_MIN_VALUE 0NUMERIC_MAX_VALUE 1000000NUMERIC_BLOCK_SIZE 0ENUM_VALUE_LIST NULLREAD_ONLY NOCOMMAND_LINE_ARGUMENT REQUIREDVARIABLE_NAME INNODB_AUTOEXTEND_INCREMENTSESSION_VALUE NULLDEFAULT_VALUE 64VARIABLE_SCOPE GLOBALVARIABLE_TYPE BIGINT UNSIGNEDVARIABLE_COMMENT Data file autoextend increment in megabytesNUMERIC_MIN_VALUE 1NUMERIC_MAX_VALUE 1000NUMERIC_BLOCK_SIZE 0ENUM_VALUE_LIST NULLREAD_ONLY NOCOMMAND_LINE_ARGUMENT REQUIREDVARIABLE_NAME INNODB_AUTOINC_LOCK_MODESESSION_VALUE NULLDEFAULT_VALUE 1VARIABLE_SCOPE GLOBALVARIABLE_TYPE BIGINTVARIABLE_COMMENT The AUTOINC lock modes supported by InnoDB: 0 => Old style AUTOINC locking (for backward compatibility); 1 => New style AUTOINC locking; 2 => No AUTOINC locking (unsafe for SBR)NUMERIC_MIN_VALUE 0NUMERIC_MAX_VALUE 2NUMERIC_BLOCK_SIZE 0ENUM_VALUE_LIST NULLREAD_ONLY YESCOMMAND_LINE_ARGUMENT REQUIREDVARIABLE_NAME INNODB_BACKGROUND_DROP_LIST_EMPTYSESSION_VALUE NULLDEFAULT_VALUE OFFVARIABLE_SCOPE GLOBALVARIABLE_TYPE BOOLEANVARIABLE_COMMENT Wait for the background drop list to become emptyNUMERIC_MIN_VALUE NULLNUMERIC_MAX_VALUE NULLNUMERIC_BLOCK_SIZE NULLENUM_VALUE_LIST OFF,ONREAD_ONLY NOCOMMAND_LINE_ARGUMENT OPTIONALVARIABLE_NAME INNODB_BACKGROUND_SCRUB_DATA_CHECK_INTERVALSESSION_VALUE NULLDEFAULT_VALUE 3600VARIABLE_SCOPE GLOBALVARIABLE_TYPE INT UNSIGNEDVARIABLE_COMMENT check if spaces needs scrubbing every innodb_background_scrub_data_check_interval secondsNUMERIC_MIN_VALUE 1NUMERIC_MAX_VALUE 4294967295NUMERIC_BLOCK_SIZE 0ENUM_VALUE_LIST NULLREAD_ONLY NOCOMMAND_LINE_ARGUMENT REQUIREDVARIABLE_NAME INNODB_BACKGROUND_SCRUB_DATA_COMPRESSEDSESSION_VALUE NULLDEFAULT_VALUE OFFVARIABLE_SCOPE GLOBALVARIABLE_TYPE BOOLEANVARIABLE_COMMENT Enable scrubbing of compressed data by background threads (same as encryption_threads)NUMERIC_MIN_VALUE NULLNUMERIC_MAX_VALUE NULLNUMERIC_BLOCK_SIZE NULLENUM_VALUE_LIST OFF,ONREAD_ONLY NOCOMMAND_LINE_ARGUMENT REQUIREDVARIABLE_NAME INNODB_BACKGROUND_SCRUB_DATA_INTERVALSESSION_VALUE NULLDEFAULT_VALUE 604800VARIABLE_SCOPE GLOBALVARIABLE_TYPE INT UNSIGNEDVARIABLE_COMMENT scrub spaces that were last scrubbed longer than innodb_background_scrub_data_interval seconds agoNUMERIC_MIN_VALUE 1NUMERIC_MAX_VALUE 4294967295NUMERIC_BLOCK_SIZE 0ENUM_VALUE_LIST NULLREAD_ONLY NOCOMMAND_LINE_ARGUMENT REQUIREDVARIABLE_NAME INNODB_BACKGROUND_SCRUB_DATA_UNCOMPRESSEDSESSION_VALUE NULLDEFAULT_VALUE OFFVARIABLE_SCOPE GLOBALVARIABLE_TYPE BOOLEANVARIABLE_COMMENT Enable scrubbing of uncompressed data by background threads (same as encryption_threads)NUMERIC_MIN_VALUE NULLNUMERIC_MAX_VALUE NULLNUMERIC_BLOCK_SIZE NULLENUM_VALUE_LIST OFF,ONREAD_ONLY NOCOMMAND_LINE_ARGUMENT REQUIREDVARIABLE_NAME INNODB_BUFFER_POOL_CHUNK_SIZESESSION_VALUE NULLDEFAULT_VALUE 134217728VARIABLE_SCOPE GLOBALVARIABLE_TYPE BIGINT UNSIGNEDVARIABLE_COMMENT Size of a single memory chunk for resizing buffer pool. Online buffer pool resizing happens at this granularity. 0 means disable resizing buffer pool.NUMERIC_MIN_VALUE 1048576NUMERIC_MAX_VALUE 9223372036854775807NUMERIC_BLOCK_SIZE 1048576ENUM_VALUE_LIST NULLREAD_ONLY YESCOMMAND_LINE_ARGUMENT REQUIREDVARIABLE_NAME INNODB_BUFFER_POOL_DUMP_AT_SHUTDOWNSESSION_VALUE NULLDEFAULT_VALUE ONVARIABLE_SCOPE GLOBALVARIABLE_TYPE BOOLEANVARIABLE_COMMENT Dump the buffer pool into a file named @@innodb_buffer_pool_filenameNUMERIC_MIN_VALUE NULLNUMERIC_MAX_VALUE NULLNUMERIC_BLOCK_SIZE NULLENUM_VALUE_LIST OFF,ONREAD_ONLY NOCOMMAND_LINE_ARGUMENT REQUIREDVARIABLE_NAME INNODB_BUFFER_POOL_DUMP_NOWSESSION_VALUE NULLDEFAULT_VALUE OFFVARIABLE_SCOPE GLOBALVARIABLE_TYPE BOOLEANVARIABLE_COMMENT Trigger an immediate dump of the buffer pool into a file named @@innodb_buffer_pool_filenameNUMERIC_MIN_VALUE NULLNUMERIC_MAX_VALUE NULLNUMERIC_BLOCK_SIZE NULLENUM_VALUE_LIST OFF,ONREAD_ONLY NOCOMMAND_LINE_ARGUMENT REQUIREDVARIABLE_NAME INNODB_BUFFER_POOL_DUMP_PCTSESSION_VALUE NULLDEFAULT_VALUE 25VARIABLE_SCOPE GLOBALVARIABLE_TYPE BIGINT UNSIGNEDVARIABLE_COMMENT Dump only the hottest N% of each buffer pool, defaults to 25NUMERIC_MIN_VALUE 1NUMERIC_MAX_VALUE 100NUMERIC_BLOCK_SIZE 0ENUM_VALUE_LIST NULLREAD_ONLY NOCOMMAND_LINE_ARGUMENT REQUIREDVARIABLE_NAME INNODB_BUFFER_POOL_EVICTSESSION_VALUE NULLDEFAULT_VALUE VARIABLE_SCOPE GLOBALVARIABLE_TYPE VARCHARVARIABLE_COMMENT Evict pages from the buffer poolNUMERIC_MIN_VALUE NULLNUMERIC_MAX_VALUE NULLNUMERIC_BLOCK_SIZE NULLENUM_VALUE_LIST NULLREAD_ONLY NOCOMMAND_LINE_ARGUMENT REQUIREDVARIABLE_NAME INNODB_BUFFER_POOL_FILENAMESESSION_VALUE NULLDEFAULT_VALUE ib_buffer_poolVARIABLE_SCOPE GLOBALVARIABLE_TYPE VARCHARVARIABLE_COMMENT Filename to/from which to dump/load the InnoDB buffer poolNUMERIC_MIN_VALUE NULLNUMERIC_MAX_VALUE NULLNUMERIC_BLOCK_SIZE NULLENUM_VALUE_LIST NULLREAD_ONLY NOCOMMAND_LINE_ARGUMENT REQUIREDVARIABLE_NAME INNODB_BUFFER_POOL_INSTANCESSESSION_VALUE NULLDEFAULT_VALUE 0VARIABLE_SCOPE GLOBALVARIABLE_TYPE BIGINT UNSIGNEDVARIABLE_COMMENT Deprecated parameter with no effect.NUMERIC_MIN_VALUE 0NUMERIC_MAX_VALUE 64NUMERIC_BLOCK_SIZE 0ENUM_VALUE_LIST NULLREAD_ONLY YESCOMMAND_LINE_ARGUMENT REQUIREDVARIABLE_NAME INNODB_BUFFER_POOL_LOAD_ABORTSESSION_VALUE NULLDEFAULT_VALUE OFFVARIABLE_SCOPE GLOBALVARIABLE_TYPE BOOLEANVARIABLE_COMMENT Abort a currently running load of the buffer poolNUMERIC_MIN_VALUE NULLNUMERIC_MAX_VALUE NULLNUMERIC_BLOCK_SIZE NULLENUM_VALUE_LIST OFF,ONREAD_ONLY NOCOMMAND_LINE_ARGUMENT REQUIREDVARIABLE_NAME INNODB_BUFFER_POOL_LOAD_AT_STARTUPSESSION_VALUE NULLDEFAULT_VALUE ONVARIABLE_SCOPE GLOBALVARIABLE_TYPE BOOLEANVARIABLE_COMMENT Load the buffer pool from a file named @@innodb_buffer_pool_filenameNUMERIC_MIN_VALUE NULLNUMERIC_MAX_VALUE NULLNUMERIC_BLOCK_SIZE NULLENUM_VALUE_LIST OFF,ONREAD_ONLY YESCOMMAND_LINE_ARGUMENT REQUIREDVARIABLE_NAME INNODB_BUFFER_POOL_LOAD_NOWSESSION_VALUE NULLDEFAULT_VALUE OFFVARIABLE_SCOPE GLOBALVARIABLE_TYPE BOOLEANVARIABLE_COMMENT Trigger an immediate load of the buffer pool from a file named @@innodb_buffer_pool_filenameNUMERIC_MIN_VALUE NULLNUMERIC_MAX_VALUE NULLNUMERIC_BLOCK_SIZE NULLENUM_VALUE_LIST OFF,ONREAD_ONLY NOCOMMAND_LINE_ARGUMENT REQUIREDVARIABLE_NAME INNODB_BUFFER_POOL_SIZESESSION_VALUE NULLDEFAULT_VALUE 134217728VARIABLE_SCOPE GLOBALVARIABLE_TYPE BIGINT UNSIGNEDVARIABLE_COMMENT The size of the memory buffer InnoDB uses to cache data and indexes of its tables.NUMERIC_MIN_VALUE 5242880NUMERIC_MAX_VALUE 9223372036854775807NUMERIC_BLOCK_SIZE 1048576ENUM_VALUE_LIST NULLREAD_ONLY NOCOMMAND_LINE_ARGUMENT REQUIREDVARIABLE_NAME INNODB_BUF_DUMP_STATUS_FREQUENCYSESSION_VALUE NULLDEFAULT_VALUE 0VARIABLE_SCOPE GLOBALVARIABLE_TYPE BIGINT UNSIGNEDVARIABLE_COMMENT A number between [0, 100] that tells how oftern buffer pool dump status in percentages should be printed. E.g. 10 means that buffer pool dump status is printed when every 10% of number of buffer pool pages are dumped. Default is 0 (only start and end status is printed).NUMERIC_MIN_VALUE 0NUMERIC_MAX_VALUE 100NUMERIC_BLOCK_SIZE 0ENUM_VALUE_LIST NULLREAD_ONLY NOCOMMAND_LINE_ARGUMENT REQUIREDVARIABLE_NAME INNODB_BUF_FLUSH_LIST_NOWSESSION_VALUE NULLDEFAULT_VALUE OFFVARIABLE_SCOPE GLOBALVARIABLE_TYPE BOOLEANVARIABLE_COMMENT Force dirty page flush nowNUMERIC_MIN_VALUE NULLNUMERIC_MAX_VALUE NULLNUMERIC_BLOCK_SIZE NULLENUM_VALUE_LIST OFF,ONREAD_ONLY NOCOMMAND_LINE_ARGUMENT OPTIONALVARIABLE_NAME INNODB_CHANGE_BUFFERINGSESSION_VALUE NULLDEFAULT_VALUE allVARIABLE_SCOPE GLOBALVARIABLE_TYPE ENUMVARIABLE_COMMENT Buffer changes to secondary indexes.NUMERIC_MIN_VALUE NULLNUMERIC_MAX_VALUE NULLNUMERIC_BLOCK_SIZE NULLENUM_VALUE_LIST none,inserts,deletes,changes,purges,allREAD_ONLY NOCOMMAND_LINE_ARGUMENT REQUIREDVARIABLE_NAME INNODB_CHANGE_BUFFERING_DEBUGSESSION_VALUE NULLDEFAULT_VALUE 0VARIABLE_SCOPE GLOBALVARIABLE_TYPE INT UNSIGNEDVARIABLE_COMMENT Debug flags for InnoDB change buffering (0=none, 1=try to buffer)NUMERIC_MIN_VALUE 0NUMERIC_MAX_VALUE 1NUMERIC_BLOCK_SIZE 0ENUM_VALUE_LIST NULLREAD_ONLY NOCOMMAND_LINE_ARGUMENT REQUIREDVARIABLE_NAME INNODB_CHANGE_BUFFER_DUMPSESSION_VALUE NULLDEFAULT_VALUE OFFVARIABLE_SCOPE GLOBALVARIABLE_TYPE BOOLEANVARIABLE_COMMENT Dump the change buffer at startup.NUMERIC_MIN_VALUE NULLNUMERIC_MAX_VALUE NULLNUMERIC_BLOCK_SIZE NULLENUM_VALUE_LIST OFF,ONREAD_ONLY YESCOMMAND_LINE_ARGUMENT NONEVARIABLE_NAME INNODB_CHANGE_BUFFER_MAX_SIZESESSION_VALUE NULLDEFAULT_VALUE 25VARIABLE_SCOPE GLOBALVARIABLE_TYPE INT UNSIGNEDVARIABLE_COMMENT Maximum on-disk size of change buffer in terms of percentage of the buffer pool.NUMERIC_MIN_VALUE 0NUMERIC_MAX_VALUE 50NUMERIC_BLOCK_SIZE 0ENUM_VALUE_LIST NULLREAD_ONLY NOCOMMAND_LINE_ARGUMENT REQUIREDVARIABLE_NAME INNODB_CHECKSUM_ALGORITHMSESSION_VALUE NULLDEFAULT_VALUE full_crc32VARIABLE_SCOPE GLOBALVARIABLE_TYPE ENUMVARIABLE_COMMENT The algorithm InnoDB uses for page checksumming. Possible values are FULL_CRC32 for new files, always use CRC-32C; for old, see CRC32 below; STRICT_FULL_CRC32 for new files, always use CRC-32C; for old, see STRICT_CRC32 below; CRC32 write crc32, allow any of the other checksums to match when reading; STRICT_CRC32 write crc32, do not allow other algorithms to match when reading; INNODB write a software calculated checksum, allow any other checksums to match when reading; STRICT_INNODB write a software calculated checksum, do not allow other algorithms to match when reading; NONE write a constant magic number, do not do any checksum verification when reading (same as innodb_checksums=OFF); STRICT_NONE write a constant magic number, do not allow values other than that magic number when reading; Files updated when this option is set to crc32 or strict_crc32 will not be readable by MariaDB versions older than 10.0.4; new files created with full_crc32 are readable by MariaDB 10.4.3+NUMERIC_MIN_VALUE NULLNUMERIC_MAX_VALUE NULLNUMERIC_BLOCK_SIZE NULLENUM_VALUE_LIST crc32,strict_crc32,innodb,strict_innodb,none,strict_none,full_crc32,strict_full_crc32READ_ONLY NOCOMMAND_LINE_ARGUMENT REQUIREDVARIABLE_NAME INNODB_CMP_PER_INDEX_ENABLEDSESSION_VALUE NULLDEFAULT_VALUE OFFVARIABLE_SCOPE GLOBALVARIABLE_TYPE BOOLEANVARIABLE_COMMENT Enable INFORMATION_SCHEMA.innodb_cmp_per_index, may have negative impact on performance (off by default)NUMERIC_MIN_VALUE NULLNUMERIC_MAX_VALUE NULLNUMERIC_BLOCK_SIZE NULLENUM_VALUE_LIST OFF,ONREAD_ONLY NOCOMMAND_LINE_ARGUMENT OPTIONALVARIABLE_NAME INNODB_COMMIT_CONCURRENCYSESSION_VALUE NULLDEFAULT_VALUE 0VARIABLE_SCOPE GLOBALVARIABLE_TYPE BIGINT UNSIGNEDVARIABLE_COMMENT Helps in performance tuning in heavily concurrent environments.NUMERIC_MIN_VALUE 0NUMERIC_MAX_VALUE 1000NUMERIC_BLOCK_SIZE 0ENUM_VALUE_LIST NULLREAD_ONLY NOCOMMAND_LINE_ARGUMENT REQUIREDVARIABLE_NAME INNODB_COMPRESSION_ALGORITHMSESSION_VALUE NULLDEFAULT_VALUE zlibVARIABLE_SCOPE GLOBALVARIABLE_TYPE ENUMVARIABLE_COMMENT Compression algorithm used on page compression. One of: none, zlib, lz4, lzo, lzma, or bzip2NUMERIC_MIN_VALUE NULLNUMERIC_MAX_VALUE NULLNUMERIC_BLOCK_SIZE NULLENUM_VALUE_LIST none,zlib,lz4,lzo,lzma,bzip2,snappyREAD_ONLY NOCOMMAND_LINE_ARGUMENT OPTIONALVARIABLE_NAME INNODB_COMPRESSION_DEFAULTSESSION_VALUE OFFDEFAULT_VALUE OFFVARIABLE_SCOPE SESSIONVARIABLE_TYPE BOOLEANVARIABLE_COMMENT Is compression the default for new tablesNUMERIC_MIN_VALUE NULLNUMERIC_MAX_VALUE NULLNUMERIC_BLOCK_SIZE NULLENUM_VALUE_LIST OFF,ONREAD_ONLY NOCOMMAND_LINE_ARGUMENT OPTIONALVARIABLE_NAME INNODB_COMPRESSION_FAILURE_THRESHOLD_PCTSESSION_VALUE NULLDEFAULT_VALUE 5VARIABLE_SCOPE GLOBALVARIABLE_TYPE BIGINT UNSIGNEDVARIABLE_COMMENT If the compression failure rate of a table is greater than this number more padding is added to the pages to reduce the failures. A value of zero implies no paddingNUMERIC_MIN_VALUE 0NUMERIC_MAX_VALUE 100NUMERIC_BLOCK_SIZE 0ENUM_VALUE_LIST NULLREAD_ONLY NOCOMMAND_LINE_ARGUMENT OPTIONALVARIABLE_NAME INNODB_COMPRESSION_LEVELSESSION_VALUE NULLDEFAULT_VALUE 6VARIABLE_SCOPE GLOBALVARIABLE_TYPE INT UNSIGNEDVARIABLE_COMMENT Compression level used for zlib compression. 0 is no compression, 1 is fastest, 9 is best compression and default is 6.NUMERIC_MIN_VALUE 0NUMERIC_MAX_VALUE 9NUMERIC_BLOCK_SIZE 0ENUM_VALUE_LIST NULLREAD_ONLY NOCOMMAND_LINE_ARGUMENT REQUIREDVARIABLE_NAME INNODB_COMPRESSION_PAD_PCT_MAXSESSION_VALUE NULLDEFAULT_VALUE 50VARIABLE_SCOPE GLOBALVARIABLE_TYPE BIGINT UNSIGNEDVARIABLE_COMMENT Percentage of empty space on a data page that can be reserved to make the page compressible.NUMERIC_MIN_VALUE 0NUMERIC_MAX_VALUE 75NUMERIC_BLOCK_SIZE 0ENUM_VALUE_LIST NULLREAD_ONLY NOCOMMAND_LINE_ARGUMENT OPTIONALVARIABLE_NAME INNODB_CONCURRENCY_TICKETSSESSION_VALUE NULLDEFAULT_VALUE 5000VARIABLE_SCOPE GLOBALVARIABLE_TYPE BIGINT UNSIGNEDVARIABLE_COMMENT Number of times a thread is allowed to enter InnoDB within the same SQL query after it has once got the ticketNUMERIC_MIN_VALUE 1NUMERIC_MAX_VALUE 18446744073709551615NUMERIC_BLOCK_SIZE 0ENUM_VALUE_LIST NULLREAD_ONLY NOCOMMAND_LINE_ARGUMENT REQUIREDVARIABLE_NAME INNODB_DATA_FILE_PATHSESSION_VALUE NULLDEFAULT_VALUE ibdata1:12M:autoextendVARIABLE_SCOPE GLOBALVARIABLE_TYPE VARCHARVARIABLE_COMMENT Path to individual files and their sizes.NUMERIC_MIN_VALUE NULLNUMERIC_MAX_VALUE NULLNUMERIC_BLOCK_SIZE NULLENUM_VALUE_LIST NULLREAD_ONLY YESCOMMAND_LINE_ARGUMENT REQUIREDVARIABLE_NAME INNODB_DATA_FILE_SIZE_DEBUGSESSION_VALUE NULLDEFAULT_VALUE 0VARIABLE_SCOPE GLOBALVARIABLE_TYPE INT UNSIGNEDVARIABLE_COMMENT InnoDB system tablespace size to be set in recovery.NUMERIC_MIN_VALUE 0NUMERIC_MAX_VALUE 4294967295NUMERIC_BLOCK_SIZE 0ENUM_VALUE_LIST NULLREAD_ONLY YESCOMMAND_LINE_ARGUMENT REQUIREDVARIABLE_NAME INNODB_DATA_HOME_DIRSESSION_VALUE NULLDEFAULT_VALUE VARIABLE_SCOPE GLOBALVARIABLE_TYPE VARCHARVARIABLE_COMMENT The common part for InnoDB table spaces.NUMERIC_MIN_VALUE NULLNUMERIC_MAX_VALUE NULLNUMERIC_BLOCK_SIZE NULLENUM_VALUE_LIST NULLREAD_ONLY YESCOMMAND_LINE_ARGUMENT REQUIREDVARIABLE_NAME INNODB_DEADLOCK_DETECTSESSION_VALUE NULLDEFAULT_VALUE ONVARIABLE_SCOPE GLOBALVARIABLE_TYPE BOOLEANVARIABLE_COMMENT Enable/disable InnoDB deadlock detector (default ON). if set to OFF, deadlock detection is skipped, and we rely on innodb_lock_wait_timeout in case of deadlock.NUMERIC_MIN_VALUE NULLNUMERIC_MAX_VALUE NULLNUMERIC_BLOCK_SIZE NULLENUM_VALUE_LIST OFF,ONREAD_ONLY NOCOMMAND_LINE_ARGUMENT NONEVARIABLE_NAME INNODB_DEBUG_FORCE_SCRUBBINGSESSION_VALUE NULLDEFAULT_VALUE OFFVARIABLE_SCOPE GLOBALVARIABLE_TYPE BOOLEANVARIABLE_COMMENT Perform extra scrubbing to increase test exposureNUMERIC_MIN_VALUE NULLNUMERIC_MAX_VALUE NULLNUMERIC_BLOCK_SIZE NULLENUM_VALUE_LIST OFF,ONREAD_ONLY NOCOMMAND_LINE_ARGUMENT REQUIREDVARIABLE_NAME INNODB_DEFAULT_ENCRYPTION_KEY_IDSESSION_VALUE 1DEFAULT_VALUE 1VARIABLE_SCOPE SESSIONVARIABLE_TYPE INT UNSIGNEDVARIABLE_COMMENT Default encryption key id used for table encryption.NUMERIC_MIN_VALUE 1NUMERIC_MAX_VALUE 4294967295NUMERIC_BLOCK_SIZE 0ENUM_VALUE_LIST NULLREAD_ONLY NOCOMMAND_LINE_ARGUMENT REQUIREDVARIABLE_NAME INNODB_DEFAULT_ROW_FORMATSESSION_VALUE NULLDEFAULT_VALUE dynamicVARIABLE_SCOPE GLOBALVARIABLE_TYPE ENUMVARIABLE_COMMENT The default ROW FORMAT for all innodb tables created without explicit ROW_FORMAT. Possible values are REDUNDANT, COMPACT, and DYNAMIC. The ROW_FORMAT value COMPRESSED is not allowedNUMERIC_MIN_VALUE NULLNUMERIC_MAX_VALUE NULLNUMERIC_BLOCK_SIZE NULLENUM_VALUE_LIST redundant,compact,dynamicREAD_ONLY NOCOMMAND_LINE_ARGUMENT REQUIREDVARIABLE_NAME INNODB_DEFRAGMENTSESSION_VALUE NULLDEFAULT_VALUE OFFVARIABLE_SCOPE GLOBALVARIABLE_TYPE BOOLEANVARIABLE_COMMENT Enable/disable InnoDB defragmentation (default FALSE). When set to FALSE, all existing defragmentation will be paused. And new defragmentation command will fail.Paused defragmentation commands will resume when this variable is set to true again.NUMERIC_MIN_VALUE NULLNUMERIC_MAX_VALUE NULLNUMERIC_BLOCK_SIZE NULLENUM_VALUE_LIST OFF,ONREAD_ONLY NOCOMMAND_LINE_ARGUMENT REQUIREDVARIABLE_NAME INNODB_DEFRAGMENT_FILL_FACTORSESSION_VALUE NULLDEFAULT_VALUE 0.900000VARIABLE_SCOPE GLOBALVARIABLE_TYPE DOUBLEVARIABLE_COMMENT A number between [0.7, 1] that tells defragmentation how full it should fill a page. Default is 0.9. Number below 0.7 won't make much sense.This variable, together with innodb_defragment_fill_factor_n_recs, is introduced so defragmentation won't pack the page too full and cause page split on the next insert on every page. The variable indicating more defragmentation gain is the one effective.NUMERIC_MIN_VALUE 0.7NUMERIC_MAX_VALUE 1NUMERIC_BLOCK_SIZE NULLENUM_VALUE_LIST NULLREAD_ONLY NOCOMMAND_LINE_ARGUMENT REQUIREDVARIABLE_NAME INNODB_DEFRAGMENT_FILL_FACTOR_N_RECSSESSION_VALUE NULLDEFAULT_VALUE 20VARIABLE_SCOPE GLOBALVARIABLE_TYPE INT UNSIGNEDVARIABLE_COMMENT How many records of space defragmentation should leave on the page. This variable, together with innodb_defragment_fill_factor, is introduced so defragmentation won't pack the page too full and cause page split on the next insert on every page. The variable indicating more defragmentation gain is the one effective.NUMERIC_MIN_VALUE 1NUMERIC_MAX_VALUE 100NUMERIC_BLOCK_SIZE 0ENUM_VALUE_LIST NULLREAD_ONLY NOCOMMAND_LINE_ARGUMENT REQUIREDVARIABLE_NAME INNODB_DEFRAGMENT_FREQUENCYSESSION_VALUE NULLDEFAULT_VALUE 40VARIABLE_SCOPE GLOBALVARIABLE_TYPE INT UNSIGNEDVARIABLE_COMMENT Do not defragment a single index more than this number of time per second.This controls the number of time defragmentation thread can request X_LOCK on an index. Defragmentation thread will check whether 1/defragment_frequency (s) has passed since it worked on this index last time, and put the index back to the queue if not enough time has passed. The actual frequency can only be lower than this given number.NUMERIC_MIN_VALUE 1NUMERIC_MAX_VALUE 1000NUMERIC_BLOCK_SIZE 0ENUM_VALUE_LIST NULLREAD_ONLY NOCOMMAND_LINE_ARGUMENT REQUIREDVARIABLE_NAME INNODB_DEFRAGMENT_N_PAGESSESSION_VALUE NULLDEFAULT_VALUE 7VARIABLE_SCOPE GLOBALVARIABLE_TYPE INT UNSIGNEDVARIABLE_COMMENT Number of pages considered at once when merging multiple pages to defragmentNUMERIC_MIN_VALUE 2NUMERIC_MAX_VALUE 32NUMERIC_BLOCK_SIZE 0ENUM_VALUE_LIST NULLREAD_ONLY NOCOMMAND_LINE_ARGUMENT REQUIREDVARIABLE_NAME INNODB_DEFRAGMENT_STATS_ACCURACYSESSION_VALUE NULLDEFAULT_VALUE 0VARIABLE_SCOPE GLOBALVARIABLE_TYPE INT UNSIGNEDVARIABLE_COMMENT How many defragment stats changes there are before the stats are written to persistent storage. Set to 0 meaning disable defragment stats tracking.NUMERIC_MIN_VALUE 0NUMERIC_MAX_VALUE 4294967295NUMERIC_BLOCK_SIZE 0ENUM_VALUE_LIST NULLREAD_ONLY NOCOMMAND_LINE_ARGUMENT REQUIREDVARIABLE_NAME INNODB_DICT_STATS_DISABLED_DEBUGSESSION_VALUE NULLDEFAULT_VALUE OFFVARIABLE_SCOPE GLOBALVARIABLE_TYPE BOOLEANVARIABLE_COMMENT Disable dict_stats threadNUMERIC_MIN_VALUE NULLNUMERIC_MAX_VALUE NULLNUMERIC_BLOCK_SIZE NULLENUM_VALUE_LIST OFF,ONREAD_ONLY NOCOMMAND_LINE_ARGUMENT OPTIONALVARIABLE_NAME INNODB_DISABLE_RESIZE_BUFFER_POOL_DEBUGSESSION_VALUE NULLDEFAULT_VALUE ONVARIABLE_SCOPE GLOBALVARIABLE_TYPE BOOLEANVARIABLE_COMMENT Disable resizing buffer pool to make assertion code not expensive.NUMERIC_MIN_VALUE NULLNUMERIC_MAX_VALUE NULLNUMERIC_BLOCK_SIZE NULLENUM_VALUE_LIST OFF,ONREAD_ONLY NOCOMMAND_LINE_ARGUMENT NONEVARIABLE_NAME INNODB_DISABLE_SORT_FILE_CACHESESSION_VALUE NULLDEFAULT_VALUE OFFVARIABLE_SCOPE GLOBALVARIABLE_TYPE BOOLEANVARIABLE_COMMENT Whether to disable OS system file cache for sort I/ONUMERIC_MIN_VALUE NULLNUMERIC_MAX_VALUE NULLNUMERIC_BLOCK_SIZE NULLENUM_VALUE_LIST OFF,ONREAD_ONLY NOCOMMAND_LINE_ARGUMENT OPTIONALVARIABLE_NAME INNODB_DOUBLEWRITESESSION_VALUE NULLDEFAULT_VALUE ONVARIABLE_SCOPE GLOBALVARIABLE_TYPE BOOLEANVARIABLE_COMMENT Enable InnoDB doublewrite buffer (enabled by default). Disable with --skip-innodb-doublewrite.NUMERIC_MIN_VALUE NULLNUMERIC_MAX_VALUE NULLNUMERIC_BLOCK_SIZE NULLENUM_VALUE_LIST OFF,ONREAD_ONLY YESCOMMAND_LINE_ARGUMENT NONEVARIABLE_NAME INNODB_DOUBLEWRITE_BATCH_SIZESESSION_VALUE NULLDEFAULT_VALUE 120VARIABLE_SCOPE GLOBALVARIABLE_TYPE BIGINT UNSIGNEDVARIABLE_COMMENT Number of pages reserved in doublewrite buffer for batch flushingNUMERIC_MIN_VALUE 1NUMERIC_MAX_VALUE 127NUMERIC_BLOCK_SIZE 0ENUM_VALUE_LIST NULLREAD_ONLY YESCOMMAND_LINE_ARGUMENT OPTIONALVARIABLE_NAME INNODB_ENCRYPTION_ROTATE_KEY_AGESESSION_VALUE NULLDEFAULT_VALUE 1VARIABLE_SCOPE GLOBALVARIABLE_TYPE INT UNSIGNEDVARIABLE_COMMENT Key rotation - re-encrypt in background all pages that were encrypted with a key that many (or more) versions behind. Value 0 indicates that key rotation is disabled.NUMERIC_MIN_VALUE 0NUMERIC_MAX_VALUE 4294967295NUMERIC_BLOCK_SIZE 0ENUM_VALUE_LIST NULLREAD_ONLY NOCOMMAND_LINE_ARGUMENT REQUIREDVARIABLE_NAME INNODB_ENCRYPTION_ROTATION_IOPSSESSION_VALUE NULLDEFAULT_VALUE 100VARIABLE_SCOPE GLOBALVARIABLE_TYPE INT UNSIGNEDVARIABLE_COMMENT Use this many iops for background key rotationNUMERIC_MIN_VALUE 0NUMERIC_MAX_VALUE 4294967295NUMERIC_BLOCK_SIZE 0ENUM_VALUE_LIST NULLREAD_ONLY NOCOMMAND_LINE_ARGUMENT REQUIREDVARIABLE_NAME INNODB_ENCRYPTION_THREADSSESSION_VALUE NULLDEFAULT_VALUE 0VARIABLE_SCOPE GLOBALVARIABLE_TYPE INT UNSIGNEDVARIABLE_COMMENT Number of threads performing background key rotation and scrubbingNUMERIC_MIN_VALUE 0NUMERIC_MAX_VALUE 4294967295NUMERIC_BLOCK_SIZE 0ENUM_VALUE_LIST NULLREAD_ONLY NOCOMMAND_LINE_ARGUMENT REQUIREDVARIABLE_NAME INNODB_ENCRYPT_LOGSESSION_VALUE NULLDEFAULT_VALUE OFFVARIABLE_SCOPE GLOBALVARIABLE_TYPE BOOLEANVARIABLE_COMMENT Enable redo log encryptionNUMERIC_MIN_VALUE NULLNUMERIC_MAX_VALUE NULLNUMERIC_BLOCK_SIZE NULLENUM_VALUE_LIST OFF,ONREAD_ONLY YESCOMMAND_LINE_ARGUMENT OPTIONALVARIABLE_NAME INNODB_ENCRYPT_TABLESSESSION_VALUE NULLDEFAULT_VALUE OFFVARIABLE_SCOPE GLOBALVARIABLE_TYPE ENUMVARIABLE_COMMENT Enable encryption for tables. Don't forget to enable --innodb-encrypt-log tooNUMERIC_MIN_VALUE NULLNUMERIC_MAX_VALUE NULLNUMERIC_BLOCK_SIZE NULLENUM_VALUE_LIST OFF,ON,FORCEREAD_ONLY NOCOMMAND_LINE_ARGUMENT OPTIONALVARIABLE_NAME INNODB_ENCRYPT_TEMPORARY_TABLESSESSION_VALUE NULLDEFAULT_VALUE OFFVARIABLE_SCOPE GLOBALVARIABLE_TYPE BOOLEANVARIABLE_COMMENT Enrypt the temporary table data.NUMERIC_MIN_VALUE NULLNUMERIC_MAX_VALUE NULLNUMERIC_BLOCK_SIZE NULLENUM_VALUE_LIST OFF,ONREAD_ONLY YESCOMMAND_LINE_ARGUMENT OPTIONALVARIABLE_NAME INNODB_FAST_SHUTDOWNSESSION_VALUE NULLDEFAULT_VALUE 1VARIABLE_SCOPE GLOBALVARIABLE_TYPE INT UNSIGNEDVARIABLE_COMMENT Speeds up the shutdown process of the InnoDB storage engine. Possible values are 0, 1 (faster), 2 (crash-like), 3 (fastest clean).NUMERIC_MIN_VALUE 0NUMERIC_MAX_VALUE 3NUMERIC_BLOCK_SIZE 0ENUM_VALUE_LIST NULLREAD_ONLY NOCOMMAND_LINE_ARGUMENT OPTIONALVARIABLE_NAME INNODB_FATAL_SEMAPHORE_WAIT_THRESHOLDSESSION_VALUE NULLDEFAULT_VALUE 600VARIABLE_SCOPE GLOBALVARIABLE_TYPE BIGINT UNSIGNEDVARIABLE_COMMENT Maximum number of seconds that semaphore times out in InnoDB.NUMERIC_MIN_VALUE 1NUMERIC_MAX_VALUE 4294967295NUMERIC_BLOCK_SIZE 0ENUM_VALUE_LIST NULLREAD_ONLY YESCOMMAND_LINE_ARGUMENT REQUIREDVARIABLE_NAME INNODB_FILE_FORMATSESSION_VALUE NULLDEFAULT_VALUE VARIABLE_SCOPE GLOBALVARIABLE_TYPE VARCHARVARIABLE_COMMENT Deprecated parameter with no effect.NUMERIC_MIN_VALUE NULLNUMERIC_MAX_VALUE NULLNUMERIC_BLOCK_SIZE NULLENUM_VALUE_LIST NULLREAD_ONLY YESCOMMAND_LINE_ARGUMENT REQUIREDVARIABLE_NAME INNODB_FILE_PER_TABLESESSION_VALUE NULLDEFAULT_VALUE ONVARIABLE_SCOPE GLOBALVARIABLE_TYPE BOOLEANVARIABLE_COMMENT Stores each InnoDB table to an .ibd file in the database dir.NUMERIC_MIN_VALUE NULLNUMERIC_MAX_VALUE NULLNUMERIC_BLOCK_SIZE NULLENUM_VALUE_LIST OFF,ONREAD_ONLY NOCOMMAND_LINE_ARGUMENT NONEVARIABLE_NAME INNODB_FILL_FACTORSESSION_VALUE NULLDEFAULT_VALUE 100VARIABLE_SCOPE GLOBALVARIABLE_TYPE INT UNSIGNEDVARIABLE_COMMENT Percentage of B-tree page filled during bulk insertNUMERIC_MIN_VALUE 10NUMERIC_MAX_VALUE 100NUMERIC_BLOCK_SIZE 0ENUM_VALUE_LIST NULLREAD_ONLY NOCOMMAND_LINE_ARGUMENT REQUIREDVARIABLE_NAME INNODB_FIL_MAKE_PAGE_DIRTY_DEBUGSESSION_VALUE NULLDEFAULT_VALUE 0VARIABLE_SCOPE GLOBALVARIABLE_TYPE BIGINT UNSIGNEDVARIABLE_COMMENT Make the first page of the given tablespace dirty.NUMERIC_MIN_VALUE 0NUMERIC_MAX_VALUE 4294967295NUMERIC_BLOCK_SIZE 0ENUM_VALUE_LIST NULLREAD_ONLY NOCOMMAND_LINE_ARGUMENT OPTIONALVARIABLE_NAME INNODB_FLUSHING_AVG_LOOPSSESSION_VALUE NULLDEFAULT_VALUE 30VARIABLE_SCOPE GLOBALVARIABLE_TYPE BIGINT UNSIGNEDVARIABLE_COMMENT Number of iterations over which the background flushing is averaged.NUMERIC_MIN_VALUE 1NUMERIC_MAX_VALUE 1000NUMERIC_BLOCK_SIZE 0ENUM_VALUE_LIST NULLREAD_ONLY NOCOMMAND_LINE_ARGUMENT REQUIREDVARIABLE_NAME INNODB_FLUSH_LOG_AT_TIMEOUTSESSION_VALUE NULLDEFAULT_VALUE 1VARIABLE_SCOPE GLOBALVARIABLE_TYPE INT UNSIGNEDVARIABLE_COMMENT Write and flush logs every (n) second.NUMERIC_MIN_VALUE 0NUMERIC_MAX_VALUE 2700NUMERIC_BLOCK_SIZE 0ENUM_VALUE_LIST NULLREAD_ONLY NOCOMMAND_LINE_ARGUMENT OPTIONALVARIABLE_NAME INNODB_FLUSH_LOG_AT_TRX_COMMITSESSION_VALUE NULLDEFAULT_VALUE 1VARIABLE_SCOPE GLOBALVARIABLE_TYPE BIGINT UNSIGNEDVARIABLE_COMMENT Controls the durability/speed trade-off for commits. Set to 0 (write and flush redo log to disk only once per second), 1 (flush to disk at each commit), 2 (write to log at commit but flush to disk only once per second) or 3 (flush to disk at prepare and at commit, slower and usually redundant). 1 and 3 guarantees that after a crash, committed transactions will not be lost and will be consistent with the binlog and other transactional engines. 2 can get inconsistent and lose transactions if there is a power failure or kernel crash but not if mysqld crashes. 0 has no guarantees in case of crash. 0 and 2 can be faster than 1 or 3.NUMERIC_MIN_VALUE 0NUMERIC_MAX_VALUE 3NUMERIC_BLOCK_SIZE 0ENUM_VALUE_LIST NULLREAD_ONLY NOCOMMAND_LINE_ARGUMENT OPTIONALVARIABLE_NAME INNODB_FLUSH_METHODSESSION_VALUE NULLDEFAULT_VALUE fsyncVARIABLE_SCOPE GLOBALVARIABLE_TYPE ENUMVARIABLE_COMMENT With which method to flush data.NUMERIC_MIN_VALUE NULLNUMERIC_MAX_VALUE NULLNUMERIC_BLOCK_SIZE NULLENUM_VALUE_LIST fsync,O_DSYNC,littlesync,nosync,O_DIRECT,O_DIRECT_NO_FSYNCREAD_ONLY YESCOMMAND_LINE_ARGUMENT REQUIREDVARIABLE_NAME INNODB_FLUSH_NEIGHBORSSESSION_VALUE NULLDEFAULT_VALUE 1VARIABLE_SCOPE GLOBALVARIABLE_TYPE BIGINT UNSIGNEDVARIABLE_COMMENT Set to 0 (don't flush neighbors from buffer pool), 1 (flush contiguous neighbors from buffer pool) or 2 (flush neighbors from buffer pool), when flushing a blockNUMERIC_MIN_VALUE 0NUMERIC_MAX_VALUE 2NUMERIC_BLOCK_SIZE 0ENUM_VALUE_LIST NULLREAD_ONLY NOCOMMAND_LINE_ARGUMENT OPTIONALVARIABLE_NAME INNODB_FLUSH_SYNCSESSION_VALUE NULLDEFAULT_VALUE ONVARIABLE_SCOPE GLOBALVARIABLE_TYPE BOOLEANVARIABLE_COMMENT Allow IO bursts at the checkpoints ignoring io_capacity setting.NUMERIC_MIN_VALUE NULLNUMERIC_MAX_VALUE NULLNUMERIC_BLOCK_SIZE NULLENUM_VALUE_LIST OFF,ONREAD_ONLY NOCOMMAND_LINE_ARGUMENT NONEVARIABLE_NAME INNODB_FORCE_LOAD_CORRUPTEDSESSION_VALUE NULLDEFAULT_VALUE OFFVARIABLE_SCOPE GLOBALVARIABLE_TYPE BOOLEANVARIABLE_COMMENT Force InnoDB to load metadata of corrupted table.NUMERIC_MIN_VALUE NULLNUMERIC_MAX_VALUE NULLNUMERIC_BLOCK_SIZE NULLENUM_VALUE_LIST OFF,ONREAD_ONLY YESCOMMAND_LINE_ARGUMENT NONEVARIABLE_NAME INNODB_FORCE_PRIMARY_KEYSESSION_VALUE NULLDEFAULT_VALUE OFFVARIABLE_SCOPE GLOBALVARIABLE_TYPE BOOLEANVARIABLE_COMMENT Do not allow to create table without primary key (off by default)NUMERIC_MIN_VALUE NULLNUMERIC_MAX_VALUE NULLNUMERIC_BLOCK_SIZE NULLENUM_VALUE_LIST OFF,ONREAD_ONLY NOCOMMAND_LINE_ARGUMENT OPTIONALVARIABLE_NAME INNODB_FORCE_RECOVERYSESSION_VALUE NULLDEFAULT_VALUE 0VARIABLE_SCOPE GLOBALVARIABLE_TYPE BIGINT UNSIGNEDVARIABLE_COMMENT Helps to save your data in case the disk image of the database becomes corrupt. Value 5 can return bogus data, and 6 can permanently corrupt data.NUMERIC_MIN_VALUE 0NUMERIC_MAX_VALUE 6NUMERIC_BLOCK_SIZE 0ENUM_VALUE_LIST NULLREAD_ONLY YESCOMMAND_LINE_ARGUMENT REQUIREDVARIABLE_NAME INNODB_FT_AUX_TABLESESSION_VALUE NULLDEFAULT_VALUE VARIABLE_SCOPE GLOBALVARIABLE_TYPE VARCHARVARIABLE_COMMENT FTS internal auxiliary table to be checkedNUMERIC_MIN_VALUE NULLNUMERIC_MAX_VALUE NULLNUMERIC_BLOCK_SIZE NULLENUM_VALUE_LIST NULLREAD_ONLY NOCOMMAND_LINE_ARGUMENT REQUIREDVARIABLE_NAME INNODB_FT_CACHE_SIZESESSION_VALUE NULLDEFAULT_VALUE 8000000VARIABLE_SCOPE GLOBALVARIABLE_TYPE BIGINT UNSIGNEDVARIABLE_COMMENT InnoDB Fulltext search cache size in bytesNUMERIC_MIN_VALUE 1600000NUMERIC_MAX_VALUE 80000000NUMERIC_BLOCK_SIZE 0ENUM_VALUE_LIST NULLREAD_ONLY YESCOMMAND_LINE_ARGUMENT REQUIREDVARIABLE_NAME INNODB_FT_ENABLE_DIAG_PRINTSESSION_VALUE NULLDEFAULT_VALUE OFFVARIABLE_SCOPE GLOBALVARIABLE_TYPE BOOLEANVARIABLE_COMMENT Whether to enable additional FTS diagnostic printout NUMERIC_MIN_VALUE NULLNUMERIC_MAX_VALUE NULLNUMERIC_BLOCK_SIZE NULLENUM_VALUE_LIST OFF,ONREAD_ONLY NOCOMMAND_LINE_ARGUMENT OPTIONALVARIABLE_NAME INNODB_FT_ENABLE_STOPWORDSESSION_VALUE ONDEFAULT_VALUE ONVARIABLE_SCOPE SESSIONVARIABLE_TYPE BOOLEANVARIABLE_COMMENT Create FTS index with stopword.NUMERIC_MIN_VALUE NULLNUMERIC_MAX_VALUE NULLNUMERIC_BLOCK_SIZE NULLENUM_VALUE_LIST OFF,ONREAD_ONLY NOCOMMAND_LINE_ARGUMENT OPTIONALVARIABLE_NAME INNODB_FT_MAX_TOKEN_SIZESESSION_VALUE NULLDEFAULT_VALUE 84VARIABLE_SCOPE GLOBALVARIABLE_TYPE BIGINT UNSIGNEDVARIABLE_COMMENT InnoDB Fulltext search maximum token size in charactersNUMERIC_MIN_VALUE 10NUMERIC_MAX_VALUE 84NUMERIC_BLOCK_SIZE 0ENUM_VALUE_LIST NULLREAD_ONLY YESCOMMAND_LINE_ARGUMENT REQUIREDVARIABLE_NAME INNODB_FT_MIN_TOKEN_SIZESESSION_VALUE NULLDEFAULT_VALUE 3VARIABLE_SCOPE GLOBALVARIABLE_TYPE BIGINT UNSIGNEDVARIABLE_COMMENT InnoDB Fulltext search minimum token size in charactersNUMERIC_MIN_VALUE 0NUMERIC_MAX_VALUE 16NUMERIC_BLOCK_SIZE 0ENUM_VALUE_LIST NULLREAD_ONLY YESCOMMAND_LINE_ARGUMENT REQUIREDVARIABLE_NAME INNODB_FT_NUM_WORD_OPTIMIZESESSION_VALUE NULLDEFAULT_VALUE 2000VARIABLE_SCOPE GLOBALVARIABLE_TYPE BIGINT UNSIGNEDVARIABLE_COMMENT InnoDB Fulltext search number of words to optimize for each optimize table call NUMERIC_MIN_VALUE 1000NUMERIC_MAX_VALUE 10000NUMERIC_BLOCK_SIZE 0ENUM_VALUE_LIST NULLREAD_ONLY NOCOMMAND_LINE_ARGUMENT OPTIONALVARIABLE_NAME INNODB_FT_RESULT_CACHE_LIMITSESSION_VALUE NULLDEFAULT_VALUE 2000000000VARIABLE_SCOPE GLOBALVARIABLE_TYPE BIGINT UNSIGNEDVARIABLE_COMMENT InnoDB Fulltext search query result cache limit in bytesNUMERIC_MIN_VALUE 1000000NUMERIC_MAX_VALUE 18446744073709551615NUMERIC_BLOCK_SIZE 0ENUM_VALUE_LIST NULLREAD_ONLY NOCOMMAND_LINE_ARGUMENT REQUIREDVARIABLE_NAME INNODB_FT_SERVER_STOPWORD_TABLESESSION_VALUE NULLDEFAULT_VALUE VARIABLE_SCOPE GLOBALVARIABLE_TYPE VARCHARVARIABLE_COMMENT The user supplied stopword table name.NUMERIC_MIN_VALUE NULLNUMERIC_MAX_VALUE NULLNUMERIC_BLOCK_SIZE NULLENUM_VALUE_LIST NULLREAD_ONLY NOCOMMAND_LINE_ARGUMENT OPTIONALVARIABLE_NAME INNODB_FT_SORT_PLL_DEGREESESSION_VALUE NULLDEFAULT_VALUE 2VARIABLE_SCOPE GLOBALVARIABLE_TYPE BIGINT UNSIGNEDVARIABLE_COMMENT InnoDB Fulltext search parallel sort degree, will round up to nearest power of 2 numberNUMERIC_MIN_VALUE 1NUMERIC_MAX_VALUE 16NUMERIC_BLOCK_SIZE 0ENUM_VALUE_LIST NULLREAD_ONLY YESCOMMAND_LINE_ARGUMENT REQUIREDVARIABLE_NAME INNODB_FT_TOTAL_CACHE_SIZESESSION_VALUE NULLDEFAULT_VALUE 640000000VARIABLE_SCOPE GLOBALVARIABLE_TYPE BIGINT UNSIGNEDVARIABLE_COMMENT Total memory allocated for InnoDB Fulltext Search cacheNUMERIC_MIN_VALUE 32000000NUMERIC_MAX_VALUE 1600000000NUMERIC_BLOCK_SIZE 0ENUM_VALUE_LIST NULLREAD_ONLY YESCOMMAND_LINE_ARGUMENT REQUIREDVARIABLE_NAME INNODB_FT_USER_STOPWORD_TABLESESSION_VALUE DEFAULT_VALUE VARIABLE_SCOPE SESSIONVARIABLE_TYPE VARCHARVARIABLE_COMMENT User supplied stopword table name, effective in the session level.NUMERIC_MIN_VALUE NULLNUMERIC_MAX_VALUE NULLNUMERIC_BLOCK_SIZE NULLENUM_VALUE_LIST NULLREAD_ONLY NOCOMMAND_LINE_ARGUMENT OPTIONALVARIABLE_NAME INNODB_IDLE_FLUSH_PCTSESSION_VALUE NULLDEFAULT_VALUE 100VARIABLE_SCOPE GLOBALVARIABLE_TYPE BIGINT UNSIGNEDVARIABLE_COMMENT Up to what percentage of dirty pages should be flushed when innodb finds it has spare resources to do so.NUMERIC_MIN_VALUE 0NUMERIC_MAX_VALUE 100NUMERIC_BLOCK_SIZE 0ENUM_VALUE_LIST NULLREAD_ONLY NOCOMMAND_LINE_ARGUMENT REQUIREDVARIABLE_NAME INNODB_IMMEDIATE_SCRUB_DATA_UNCOMPRESSEDSESSION_VALUE NULLDEFAULT_VALUE OFFVARIABLE_SCOPE GLOBALVARIABLE_TYPE BOOLEANVARIABLE_COMMENT Enable scrubbing of dataNUMERIC_MIN_VALUE NULLNUMERIC_MAX_VALUE NULLNUMERIC_BLOCK_SIZE NULLENUM_VALUE_LIST OFF,ONREAD_ONLY NOCOMMAND_LINE_ARGUMENT REQUIREDVARIABLE_NAME INNODB_IO_CAPACITYSESSION_VALUE NULLDEFAULT_VALUE 200VARIABLE_SCOPE GLOBALVARIABLE_TYPE BIGINT UNSIGNEDVARIABLE_COMMENT Number of IOPs the server can do. Tunes the background IO rateNUMERIC_MIN_VALUE 100NUMERIC_MAX_VALUE 18446744073709551615NUMERIC_BLOCK_SIZE 0ENUM_VALUE_LIST NULLREAD_ONLY NOCOMMAND_LINE_ARGUMENT REQUIREDVARIABLE_NAME INNODB_IO_CAPACITY_MAXSESSION_VALUE NULLDEFAULT_VALUE 18446744073709551615VARIABLE_SCOPE GLOBALVARIABLE_TYPE BIGINT UNSIGNEDVARIABLE_COMMENT Limit to which innodb_io_capacity can be inflated.NUMERIC_MIN_VALUE 100NUMERIC_MAX_VALUE 18446744073709551615NUMERIC_BLOCK_SIZE 0ENUM_VALUE_LIST NULLREAD_ONLY NOCOMMAND_LINE_ARGUMENT REQUIREDVARIABLE_NAME INNODB_LARGE_PREFIXSESSION_VALUE NULLDEFAULT_VALUE VARIABLE_SCOPE GLOBALVARIABLE_TYPE VARCHARVARIABLE_COMMENT Deprecated parameter with no effect.NUMERIC_MIN_VALUE NULLNUMERIC_MAX_VALUE NULLNUMERIC_BLOCK_SIZE NULLENUM_VALUE_LIST NULLREAD_ONLY YESCOMMAND_LINE_ARGUMENT REQUIREDVARIABLE_NAME INNODB_LIMIT_OPTIMISTIC_INSERT_DEBUGSESSION_VALUE NULLDEFAULT_VALUE 0VARIABLE_SCOPE GLOBALVARIABLE_TYPE INT UNSIGNEDVARIABLE_COMMENT Artificially limit the number of records per B-tree page (0=unlimited).NUMERIC_MIN_VALUE 0NUMERIC_MAX_VALUE 4294967295NUMERIC_BLOCK_SIZE 0ENUM_VALUE_LIST NULLREAD_ONLY NOCOMMAND_LINE_ARGUMENT REQUIREDVARIABLE_NAME INNODB_LOCK_SCHEDULE_ALGORITHMSESSION_VALUE NULLDEFAULT_VALUE fcfsVARIABLE_SCOPE GLOBALVARIABLE_TYPE ENUMVARIABLE_COMMENT The algorithm Innodb uses for deciding which locks to grant next when a lock is released. Possible values are FCFS grant the locks in First-Come-First-Served order; VATS use the Variance-Aware-Transaction-Scheduling algorithm, which uses an Eldest-Transaction-First heuristic.NUMERIC_MIN_VALUE NULLNUMERIC_MAX_VALUE NULLNUMERIC_BLOCK_SIZE NULLENUM_VALUE_LIST fcfs,vatsREAD_ONLY YESCOMMAND_LINE_ARGUMENT REQUIREDVARIABLE_NAME INNODB_LOCK_WAIT_TIMEOUTSESSION_VALUE 50DEFAULT_VALUE 50VARIABLE_SCOPE SESSIONVARIABLE_TYPE BIGINT UNSIGNEDVARIABLE_COMMENT Timeout in seconds an InnoDB transaction may wait for a lock before being rolled back. Values above 100000000 disable the timeout.NUMERIC_MIN_VALUE 0NUMERIC_MAX_VALUE 1073741824NUMERIC_BLOCK_SIZE 0ENUM_VALUE_LIST NULLREAD_ONLY NOCOMMAND_LINE_ARGUMENT REQUIREDVARIABLE_NAME INNODB_LOG_BUFFER_SIZESESSION_VALUE NULLDEFAULT_VALUE 16777216VARIABLE_SCOPE GLOBALVARIABLE_TYPE BIGINT UNSIGNEDVARIABLE_COMMENT The size of the buffer which InnoDB uses to write log to the log files on disk.NUMERIC_MIN_VALUE 262144NUMERIC_MAX_VALUE 9223372036854775807NUMERIC_BLOCK_SIZE 1024ENUM_VALUE_LIST NULLREAD_ONLY YESCOMMAND_LINE_ARGUMENT REQUIREDVARIABLE_NAME INNODB_LOG_CHECKPOINT_NOWSESSION_VALUE NULLDEFAULT_VALUE OFFVARIABLE_SCOPE GLOBALVARIABLE_TYPE BOOLEANVARIABLE_COMMENT Force checkpoint nowNUMERIC_MIN_VALUE NULLNUMERIC_MAX_VALUE NULLNUMERIC_BLOCK_SIZE NULLENUM_VALUE_LIST OFF,ONREAD_ONLY NOCOMMAND_LINE_ARGUMENT OPTIONALVARIABLE_NAME INNODB_LOG_CHECKSUMSSESSION_VALUE NULLDEFAULT_VALUE ONVARIABLE_SCOPE GLOBALVARIABLE_TYPE BOOLEANVARIABLE_COMMENT Deprecated parameter with no effect.NUMERIC_MIN_VALUE NULLNUMERIC_MAX_VALUE NULLNUMERIC_BLOCK_SIZE NULLENUM_VALUE_LIST OFF,ONREAD_ONLY NOCOMMAND_LINE_ARGUMENT REQUIREDVARIABLE_NAME INNODB_LOG_COMPRESSED_PAGESSESSION_VALUE NULLDEFAULT_VALUE ONVARIABLE_SCOPE GLOBALVARIABLE_TYPE BOOLEANVARIABLE_COMMENT Deprecated parameter with no effect.NUMERIC_MIN_VALUE NULLNUMERIC_MAX_VALUE NULLNUMERIC_BLOCK_SIZE NULLENUM_VALUE_LIST OFF,ONREAD_ONLY NOCOMMAND_LINE_ARGUMENT OPTIONALVARIABLE_NAME INNODB_LOG_FILES_IN_GROUPSESSION_VALUE NULLDEFAULT_VALUE 1VARIABLE_SCOPE GLOBALVARIABLE_TYPE BIGINT UNSIGNEDVARIABLE_COMMENT Deprecated parameter with no effect.NUMERIC_MIN_VALUE 1NUMERIC_MAX_VALUE 100NUMERIC_BLOCK_SIZE 0ENUM_VALUE_LIST NULLREAD_ONLY YESCOMMAND_LINE_ARGUMENT REQUIREDVARIABLE_NAME INNODB_LOG_FILE_SIZESESSION_VALUE NULLDEFAULT_VALUE 100663296VARIABLE_SCOPE GLOBALVARIABLE_TYPE BIGINT UNSIGNEDVARIABLE_COMMENT Size of each log file in a log group.NUMERIC_MIN_VALUE 1048576NUMERIC_MAX_VALUE 18446744073709551615NUMERIC_BLOCK_SIZE 65536ENUM_VALUE_LIST NULLREAD_ONLY YESCOMMAND_LINE_ARGUMENT REQUIREDVARIABLE_NAME INNODB_LOG_GROUP_HOME_DIRSESSION_VALUE NULLDEFAULT_VALUE VARIABLE_SCOPE GLOBALVARIABLE_TYPE VARCHARVARIABLE_COMMENT Path to InnoDB log files.NUMERIC_MIN_VALUE NULLNUMERIC_MAX_VALUE NULLNUMERIC_BLOCK_SIZE NULLENUM_VALUE_LIST NULLREAD_ONLY YESCOMMAND_LINE_ARGUMENT REQUIREDVARIABLE_NAME INNODB_LOG_OPTIMIZE_DDLSESSION_VALUE NULLDEFAULT_VALUE OFFVARIABLE_SCOPE GLOBALVARIABLE_TYPE BOOLEANVARIABLE_COMMENT Deprecated parameter with no effect.NUMERIC_MIN_VALUE NULLNUMERIC_MAX_VALUE NULLNUMERIC_BLOCK_SIZE NULLENUM_VALUE_LIST OFF,ONREAD_ONLY NOCOMMAND_LINE_ARGUMENT OPTIONALVARIABLE_NAME INNODB_LOG_WRITE_AHEAD_SIZESESSION_VALUE NULLDEFAULT_VALUE 8192VARIABLE_SCOPE GLOBALVARIABLE_TYPE BIGINT UNSIGNEDVARIABLE_COMMENT Redo log write ahead unit size to avoid read-on-write, it should match the OS cache block IO sizeNUMERIC_MIN_VALUE 512NUMERIC_MAX_VALUE 16384NUMERIC_BLOCK_SIZE 512ENUM_VALUE_LIST NULLREAD_ONLY NOCOMMAND_LINE_ARGUMENT REQUIREDVARIABLE_NAME INNODB_LRU_SCAN_DEPTHSESSION_VALUE NULLDEFAULT_VALUE 1024VARIABLE_SCOPE GLOBALVARIABLE_TYPE BIGINT UNSIGNEDVARIABLE_COMMENT How deep to scan LRU to keep it cleanNUMERIC_MIN_VALUE 100NUMERIC_MAX_VALUE 18446744073709551615NUMERIC_BLOCK_SIZE 0ENUM_VALUE_LIST NULLREAD_ONLY NOCOMMAND_LINE_ARGUMENT REQUIREDVARIABLE_NAME INNODB_MASTER_THREAD_DISABLED_DEBUGSESSION_VALUE NULLDEFAULT_VALUE OFFVARIABLE_SCOPE GLOBALVARIABLE_TYPE BOOLEANVARIABLE_COMMENT Disable master threadNUMERIC_MIN_VALUE NULLNUMERIC_MAX_VALUE NULLNUMERIC_BLOCK_SIZE NULLENUM_VALUE_LIST OFF,ONREAD_ONLY NOCOMMAND_LINE_ARGUMENT OPTIONALVARIABLE_NAME INNODB_MAX_DIRTY_PAGES_PCTSESSION_VALUE NULLDEFAULT_VALUE 75.000000VARIABLE_SCOPE GLOBALVARIABLE_TYPE DOUBLEVARIABLE_COMMENT Percentage of dirty pages allowed in bufferpool.NUMERIC_MIN_VALUE 0NUMERIC_MAX_VALUE 99.999NUMERIC_BLOCK_SIZE NULLENUM_VALUE_LIST NULLREAD_ONLY NOCOMMAND_LINE_ARGUMENT REQUIREDVARIABLE_NAME INNODB_MAX_DIRTY_PAGES_PCT_LWMSESSION_VALUE NULLDEFAULT_VALUE 0.000000VARIABLE_SCOPE GLOBALVARIABLE_TYPE DOUBLEVARIABLE_COMMENT Percentage of dirty pages at which flushing kicks in.NUMERIC_MIN_VALUE 0NUMERIC_MAX_VALUE 99.999NUMERIC_BLOCK_SIZE NULLENUM_VALUE_LIST NULLREAD_ONLY NOCOMMAND_LINE_ARGUMENT REQUIREDVARIABLE_NAME INNODB_MAX_PURGE_LAGSESSION_VALUE NULLDEFAULT_VALUE 0VARIABLE_SCOPE GLOBALVARIABLE_TYPE BIGINT UNSIGNEDVARIABLE_COMMENT Desired maximum length of the purge queue (0 = no limit)NUMERIC_MIN_VALUE 0NUMERIC_MAX_VALUE 18446744073709551615NUMERIC_BLOCK_SIZE 0ENUM_VALUE_LIST NULLREAD_ONLY NOCOMMAND_LINE_ARGUMENT REQUIREDVARIABLE_NAME INNODB_MAX_PURGE_LAG_DELAYSESSION_VALUE NULLDEFAULT_VALUE 0VARIABLE_SCOPE GLOBALVARIABLE_TYPE BIGINT UNSIGNEDVARIABLE_COMMENT Maximum delay of user threads in micro-secondsNUMERIC_MIN_VALUE 0NUMERIC_MAX_VALUE 10000000NUMERIC_BLOCK_SIZE 0ENUM_VALUE_LIST NULLREAD_ONLY NOCOMMAND_LINE_ARGUMENT REQUIREDVARIABLE_NAME INNODB_MAX_UNDO_LOG_SIZESESSION_VALUE NULLDEFAULT_VALUE 10485760VARIABLE_SCOPE GLOBALVARIABLE_TYPE BIGINT UNSIGNEDVARIABLE_COMMENT Desired maximum UNDO tablespace size in bytesNUMERIC_MIN_VALUE 10485760NUMERIC_MAX_VALUE 281474976710656NUMERIC_BLOCK_SIZE 0ENUM_VALUE_LIST NULLREAD_ONLY NOCOMMAND_LINE_ARGUMENT OPTIONALVARIABLE_NAME INNODB_MERGE_THRESHOLD_SET_ALL_DEBUGSESSION_VALUE NULLDEFAULT_VALUE 50VARIABLE_SCOPE GLOBALVARIABLE_TYPE INT UNSIGNEDVARIABLE_COMMENT Override current MERGE_THRESHOLD setting for all indexes at dictionary cache by the specified value dynamically, at the time.NUMERIC_MIN_VALUE 1NUMERIC_MAX_VALUE 50NUMERIC_BLOCK_SIZE 0ENUM_VALUE_LIST NULLREAD_ONLY NOCOMMAND_LINE_ARGUMENT REQUIREDVARIABLE_NAME INNODB_MONITOR_DISABLESESSION_VALUE NULLDEFAULT_VALUE VARIABLE_SCOPE GLOBALVARIABLE_TYPE VARCHARVARIABLE_COMMENT Turn off a monitor counterNUMERIC_MIN_VALUE NULLNUMERIC_MAX_VALUE NULLNUMERIC_BLOCK_SIZE NULLENUM_VALUE_LIST NULLREAD_ONLY NOCOMMAND_LINE_ARGUMENT REQUIREDVARIABLE_NAME INNODB_MONITOR_ENABLESESSION_VALUE NULLDEFAULT_VALUE VARIABLE_SCOPE GLOBALVARIABLE_TYPE VARCHARVARIABLE_COMMENT Turn on a monitor counterNUMERIC_MIN_VALUE NULLNUMERIC_MAX_VALUE NULLNUMERIC_BLOCK_SIZE NULLENUM_VALUE_LIST NULLREAD_ONLY NOCOMMAND_LINE_ARGUMENT REQUIREDVARIABLE_NAME INNODB_MONITOR_RESETSESSION_VALUE NULLDEFAULT_VALUE VARIABLE_SCOPE GLOBALVARIABLE_TYPE VARCHARVARIABLE_COMMENT Reset a monitor counterNUMERIC_MIN_VALUE NULLNUMERIC_MAX_VALUE NULLNUMERIC_BLOCK_SIZE NULLENUM_VALUE_LIST NULLREAD_ONLY NOCOMMAND_LINE_ARGUMENT REQUIREDVARIABLE_NAME INNODB_MONITOR_RESET_ALLSESSION_VALUE NULLDEFAULT_VALUE VARIABLE_SCOPE GLOBALVARIABLE_TYPE VARCHARVARIABLE_COMMENT Reset all values for a monitor counterNUMERIC_MIN_VALUE NULLNUMERIC_MAX_VALUE NULLNUMERIC_BLOCK_SIZE NULLENUM_VALUE_LIST NULLREAD_ONLY NOCOMMAND_LINE_ARGUMENT REQUIREDVARIABLE_NAME INNODB_OLD_BLOCKS_PCTSESSION_VALUE NULLDEFAULT_VALUE 37VARIABLE_SCOPE GLOBALVARIABLE_TYPE INT UNSIGNEDVARIABLE_COMMENT Percentage of the buffer pool to reserve for 'old' blocks.NUMERIC_MIN_VALUE 5NUMERIC_MAX_VALUE 95NUMERIC_BLOCK_SIZE 0ENUM_VALUE_LIST NULLREAD_ONLY NOCOMMAND_LINE_ARGUMENT REQUIREDVARIABLE_NAME INNODB_OLD_BLOCKS_TIMESESSION_VALUE NULLDEFAULT_VALUE 1000VARIABLE_SCOPE GLOBALVARIABLE_TYPE INT UNSIGNEDVARIABLE_COMMENT Move blocks to the 'new' end of the buffer pool if the first access was at least this many milliseconds ago. The timeout is disabled if 0.NUMERIC_MIN_VALUE 0NUMERIC_MAX_VALUE 4294967295NUMERIC_BLOCK_SIZE 0ENUM_VALUE_LIST NULLREAD_ONLY NOCOMMAND_LINE_ARGUMENT REQUIREDVARIABLE_NAME INNODB_ONLINE_ALTER_LOG_MAX_SIZESESSION_VALUE NULLDEFAULT_VALUE 134217728VARIABLE_SCOPE GLOBALVARIABLE_TYPE BIGINT UNSIGNEDVARIABLE_COMMENT Maximum modification log file size for online index creationNUMERIC_MIN_VALUE 65536NUMERIC_MAX_VALUE 18446744073709551615NUMERIC_BLOCK_SIZE 0ENUM_VALUE_LIST NULLREAD_ONLY NOCOMMAND_LINE_ARGUMENT REQUIREDVARIABLE_NAME INNODB_OPEN_FILESSESSION_VALUE NULLDEFAULT_VALUE 0VARIABLE_SCOPE GLOBALVARIABLE_TYPE BIGINT UNSIGNEDVARIABLE_COMMENT How many files at the maximum InnoDB keeps open at the same time.NUMERIC_MIN_VALUE 0NUMERIC_MAX_VALUE 9223372036854775807NUMERIC_BLOCK_SIZE 0ENUM_VALUE_LIST NULLREAD_ONLY YESCOMMAND_LINE_ARGUMENT REQUIREDVARIABLE_NAME INNODB_OPTIMIZE_FULLTEXT_ONLYSESSION_VALUE NULLDEFAULT_VALUE OFFVARIABLE_SCOPE GLOBALVARIABLE_TYPE BOOLEANVARIABLE_COMMENT Only optimize the Fulltext index of the tableNUMERIC_MIN_VALUE NULLNUMERIC_MAX_VALUE NULLNUMERIC_BLOCK_SIZE NULLENUM_VALUE_LIST OFF,ONREAD_ONLY NOCOMMAND_LINE_ARGUMENT NONEVARIABLE_NAME INNODB_PAGE_CLEANERSSESSION_VALUE NULLDEFAULT_VALUE 0VARIABLE_SCOPE GLOBALVARIABLE_TYPE BIGINT UNSIGNEDVARIABLE_COMMENT Deprecated parameter with no effect.NUMERIC_MIN_VALUE 0NUMERIC_MAX_VALUE 64NUMERIC_BLOCK_SIZE 0ENUM_VALUE_LIST NULLREAD_ONLY NOCOMMAND_LINE_ARGUMENT REQUIREDVARIABLE_NAME INNODB_PAGE_CLEANER_DISABLED_DEBUGSESSION_VALUE NULLDEFAULT_VALUE OFFVARIABLE_SCOPE GLOBALVARIABLE_TYPE BOOLEANVARIABLE_COMMENT Disable page cleanerNUMERIC_MIN_VALUE NULLNUMERIC_MAX_VALUE NULLNUMERIC_BLOCK_SIZE NULLENUM_VALUE_LIST OFF,ONREAD_ONLY NOCOMMAND_LINE_ARGUMENT OPTIONALVARIABLE_NAME INNODB_PAGE_HASH_LOCKSSESSION_VALUE NULLDEFAULT_VALUE 16VARIABLE_SCOPE GLOBALVARIABLE_TYPE BIGINT UNSIGNEDVARIABLE_COMMENT Number of rw_locks protecting buffer pool page_hash. Rounded up to the next power of 2NUMERIC_MIN_VALUE 1NUMERIC_MAX_VALUE 1024NUMERIC_BLOCK_SIZE 0ENUM_VALUE_LIST NULLREAD_ONLY YESCOMMAND_LINE_ARGUMENT OPTIONALVARIABLE_NAME INNODB_PAGE_SIZESESSION_VALUE NULLDEFAULT_VALUE 16384VARIABLE_SCOPE GLOBALVARIABLE_TYPE BIGINT UNSIGNEDVARIABLE_COMMENT Page size to use for all InnoDB tablespaces.NUMERIC_MIN_VALUE 4096NUMERIC_MAX_VALUE 65536NUMERIC_BLOCK_SIZE 0ENUM_VALUE_LIST NULLREAD_ONLY YESCOMMAND_LINE_ARGUMENT OPTIONALVARIABLE_NAME INNODB_PREFIX_INDEX_CLUSTER_OPTIMIZATIONSESSION_VALUE NULLDEFAULT_VALUE OFFVARIABLE_SCOPE GLOBALVARIABLE_TYPE BOOLEANVARIABLE_COMMENT Enable prefix optimization to sometimes avoid cluster index lookups.NUMERIC_MIN_VALUE NULLNUMERIC_MAX_VALUE NULLNUMERIC_BLOCK_SIZE NULLENUM_VALUE_LIST OFF,ONREAD_ONLY NOCOMMAND_LINE_ARGUMENT OPTIONALVARIABLE_NAME INNODB_PRINT_ALL_DEADLOCKSSESSION_VALUE NULLDEFAULT_VALUE OFFVARIABLE_SCOPE GLOBALVARIABLE_TYPE BOOLEANVARIABLE_COMMENT Print all deadlocks to MariaDB error log (off by default)NUMERIC_MIN_VALUE NULLNUMERIC_MAX_VALUE NULLNUMERIC_BLOCK_SIZE NULLENUM_VALUE_LIST OFF,ONREAD_ONLY NOCOMMAND_LINE_ARGUMENT OPTIONALVARIABLE_NAME INNODB_PURGE_BATCH_SIZESESSION_VALUE NULLDEFAULT_VALUE 300VARIABLE_SCOPE GLOBALVARIABLE_TYPE BIGINT UNSIGNEDVARIABLE_COMMENT Number of UNDO log pages to purge in one batch from the history list.NUMERIC_MIN_VALUE 1NUMERIC_MAX_VALUE 5000NUMERIC_BLOCK_SIZE 0ENUM_VALUE_LIST NULLREAD_ONLY NOCOMMAND_LINE_ARGUMENT OPTIONALVARIABLE_NAME INNODB_PURGE_RSEG_TRUNCATE_FREQUENCYSESSION_VALUE NULLDEFAULT_VALUE 128VARIABLE_SCOPE GLOBALVARIABLE_TYPE BIGINT UNSIGNEDVARIABLE_COMMENT Dictates rate at which UNDO records are purged. Value N means purge rollback segment(s) on every Nth iteration of purge invocationNUMERIC_MIN_VALUE 1NUMERIC_MAX_VALUE 128NUMERIC_BLOCK_SIZE 0ENUM_VALUE_LIST NULLREAD_ONLY NOCOMMAND_LINE_ARGUMENT OPTIONALVARIABLE_NAME INNODB_PURGE_THREADSSESSION_VALUE NULLDEFAULT_VALUE 4VARIABLE_SCOPE GLOBALVARIABLE_TYPE BIGINT UNSIGNEDVARIABLE_COMMENT Purge threads can be from 1 to 32. Default is 4.NUMERIC_MIN_VALUE 1NUMERIC_MAX_VALUE 32NUMERIC_BLOCK_SIZE 0ENUM_VALUE_LIST NULLREAD_ONLY YESCOMMAND_LINE_ARGUMENT OPTIONALVARIABLE_NAME INNODB_RANDOM_READ_AHEADSESSION_VALUE NULLDEFAULT_VALUE OFFVARIABLE_SCOPE GLOBALVARIABLE_TYPE BOOLEANVARIABLE_COMMENT Whether to use read ahead for random access within an extent.NUMERIC_MIN_VALUE NULLNUMERIC_MAX_VALUE NULLNUMERIC_BLOCK_SIZE NULLENUM_VALUE_LIST OFF,ONREAD_ONLY NOCOMMAND_LINE_ARGUMENT NONEVARIABLE_NAME INNODB_READ_AHEAD_THRESHOLDSESSION_VALUE NULLDEFAULT_VALUE 56VARIABLE_SCOPE GLOBALVARIABLE_TYPE BIGINT UNSIGNEDVARIABLE_COMMENT Number of pages that must be accessed sequentially for InnoDB to trigger a readahead.NUMERIC_MIN_VALUE 0NUMERIC_MAX_VALUE 64NUMERIC_BLOCK_SIZE 0ENUM_VALUE_LIST NULLREAD_ONLY NOCOMMAND_LINE_ARGUMENT REQUIREDVARIABLE_NAME INNODB_READ_IO_THREADSSESSION_VALUE NULLDEFAULT_VALUE 4VARIABLE_SCOPE GLOBALVARIABLE_TYPE BIGINT UNSIGNEDVARIABLE_COMMENT Number of background read I/O threads in InnoDB.NUMERIC_MIN_VALUE 1NUMERIC_MAX_VALUE 64NUMERIC_BLOCK_SIZE 0ENUM_VALUE_LIST NULLREAD_ONLY YESCOMMAND_LINE_ARGUMENT REQUIREDVARIABLE_NAME INNODB_READ_ONLYSESSION_VALUE NULLDEFAULT_VALUE OFFVARIABLE_SCOPE GLOBALVARIABLE_TYPE BOOLEANVARIABLE_COMMENT Start InnoDB in read only mode (off by default)NUMERIC_MIN_VALUE NULLNUMERIC_MAX_VALUE NULLNUMERIC_BLOCK_SIZE NULLENUM_VALUE_LIST OFF,ONREAD_ONLY YESCOMMAND_LINE_ARGUMENT OPTIONALVARIABLE_NAME INNODB_REPLICATION_DELAYSESSION_VALUE NULLDEFAULT_VALUE 0VARIABLE_SCOPE GLOBALVARIABLE_TYPE BIGINT UNSIGNEDVARIABLE_COMMENT Replication thread delay (ms) on the slave server if innodb_thread_concurrency is reached (0 by default)NUMERIC_MIN_VALUE 0NUMERIC_MAX_VALUE 18446744073709551615NUMERIC_BLOCK_SIZE 0ENUM_VALUE_LIST NULLREAD_ONLY NOCOMMAND_LINE_ARGUMENT REQUIREDVARIABLE_NAME INNODB_ROLLBACK_ON_TIMEOUTSESSION_VALUE NULLDEFAULT_VALUE OFFVARIABLE_SCOPE GLOBALVARIABLE_TYPE BOOLEANVARIABLE_COMMENT Roll back the complete transaction on lock wait timeout, for 4.x compatibility (disabled by default)NUMERIC_MIN_VALUE NULLNUMERIC_MAX_VALUE NULLNUMERIC_BLOCK_SIZE NULLENUM_VALUE_LIST OFF,ONREAD_ONLY YESCOMMAND_LINE_ARGUMENT OPTIONALVARIABLE_NAME INNODB_SAVED_PAGE_NUMBER_DEBUGSESSION_VALUE NULLDEFAULT_VALUE 0VARIABLE_SCOPE GLOBALVARIABLE_TYPE BIGINT UNSIGNEDVARIABLE_COMMENT An InnoDB page number.NUMERIC_MIN_VALUE 0NUMERIC_MAX_VALUE 4294967295NUMERIC_BLOCK_SIZE 0ENUM_VALUE_LIST NULLREAD_ONLY NOCOMMAND_LINE_ARGUMENT OPTIONALVARIABLE_NAME INNODB_SCRUB_LOGSESSION_VALUE NULLDEFAULT_VALUE OFFVARIABLE_SCOPE GLOBALVARIABLE_TYPE BOOLEANVARIABLE_COMMENT Enable background redo log scrubbingNUMERIC_MIN_VALUE NULLNUMERIC_MAX_VALUE NULLNUMERIC_BLOCK_SIZE NULLENUM_VALUE_LIST OFF,ONREAD_ONLY YESCOMMAND_LINE_ARGUMENT OPTIONALVARIABLE_NAME INNODB_SCRUB_LOG_SPEEDSESSION_VALUE NULLDEFAULT_VALUE 256VARIABLE_SCOPE GLOBALVARIABLE_TYPE BIGINT UNSIGNEDVARIABLE_COMMENT Background redo log scrubbing speed in bytes/secNUMERIC_MIN_VALUE 1NUMERIC_MAX_VALUE 50000NUMERIC_BLOCK_SIZE 0ENUM_VALUE_LIST NULLREAD_ONLY NOCOMMAND_LINE_ARGUMENT OPTIONALVARIABLE_NAME INNODB_SIMULATE_COMP_FAILURESSESSION_VALUE NULLDEFAULT_VALUE 0VARIABLE_SCOPE GLOBALVARIABLE_TYPE INT UNSIGNEDVARIABLE_COMMENT Simulate compression failures.NUMERIC_MIN_VALUE 0NUMERIC_MAX_VALUE 99NUMERIC_BLOCK_SIZE 0ENUM_VALUE_LIST NULLREAD_ONLY NOCOMMAND_LINE_ARGUMENT NONEVARIABLE_NAME INNODB_SORT_BUFFER_SIZESESSION_VALUE NULLDEFAULT_VALUE 1048576VARIABLE_SCOPE GLOBALVARIABLE_TYPE BIGINT UNSIGNEDVARIABLE_COMMENT Memory buffer size for index creationNUMERIC_MIN_VALUE 65536NUMERIC_MAX_VALUE 67108864NUMERIC_BLOCK_SIZE 0ENUM_VALUE_LIST NULLREAD_ONLY YESCOMMAND_LINE_ARGUMENT REQUIREDVARIABLE_NAME INNODB_SPIN_WAIT_DELAYSESSION_VALUE NULLDEFAULT_VALUE 4VARIABLE_SCOPE GLOBALVARIABLE_TYPE INT UNSIGNEDVARIABLE_COMMENT Maximum delay between polling for a spin lock (4 by default)NUMERIC_MIN_VALUE 0NUMERIC_MAX_VALUE 6000NUMERIC_BLOCK_SIZE 0ENUM_VALUE_LIST NULLREAD_ONLY NOCOMMAND_LINE_ARGUMENT OPTIONALVARIABLE_NAME INNODB_STATS_AUTO_RECALCSESSION_VALUE NULLDEFAULT_VALUE ONVARIABLE_SCOPE GLOBALVARIABLE_TYPE BOOLEANVARIABLE_COMMENT InnoDB automatic recalculation of persistent statistics enabled for all tables unless overridden at table level (automatic recalculation is only done when InnoDB decides that the table has changed too much and needs a new statistics)NUMERIC_MIN_VALUE NULLNUMERIC_MAX_VALUE NULLNUMERIC_BLOCK_SIZE NULLENUM_VALUE_LIST OFF,ONREAD_ONLY NOCOMMAND_LINE_ARGUMENT OPTIONALVARIABLE_NAME INNODB_STATS_INCLUDE_DELETE_MARKEDSESSION_VALUE NULLDEFAULT_VALUE OFFVARIABLE_SCOPE GLOBALVARIABLE_TYPE BOOLEANVARIABLE_COMMENT Include delete marked records when calculating persistent statisticsNUMERIC_MIN_VALUE NULLNUMERIC_MAX_VALUE NULLNUMERIC_BLOCK_SIZE NULLENUM_VALUE_LIST OFF,ONREAD_ONLY NOCOMMAND_LINE_ARGUMENT OPTIONALVARIABLE_NAME INNODB_STATS_METHODSESSION_VALUE NULLDEFAULT_VALUE nulls_equalVARIABLE_SCOPE GLOBALVARIABLE_TYPE ENUMVARIABLE_COMMENT Specifies how InnoDB index statistics collection code should treat NULLs. Possible values are NULLS_EQUAL (default), NULLS_UNEQUAL and NULLS_IGNOREDNUMERIC_MIN_VALUE NULLNUMERIC_MAX_VALUE NULLNUMERIC_BLOCK_SIZE NULLENUM_VALUE_LIST nulls_equal,nulls_unequal,nulls_ignoredREAD_ONLY NOCOMMAND_LINE_ARGUMENT REQUIREDVARIABLE_NAME INNODB_STATS_MODIFIED_COUNTERSESSION_VALUE NULLDEFAULT_VALUE 0VARIABLE_SCOPE GLOBALVARIABLE_TYPE BIGINT UNSIGNEDVARIABLE_COMMENT The number of rows modified before we calculate new statistics (default 0 = current limits)NUMERIC_MIN_VALUE 0NUMERIC_MAX_VALUE 18446744073709551615NUMERIC_BLOCK_SIZE 0ENUM_VALUE_LIST NULLREAD_ONLY NOCOMMAND_LINE_ARGUMENT REQUIREDVARIABLE_NAME INNODB_STATS_ON_METADATASESSION_VALUE NULLDEFAULT_VALUE OFFVARIABLE_SCOPE GLOBALVARIABLE_TYPE BOOLEANVARIABLE_COMMENT Enable statistics gathering for metadata commands such as SHOW TABLE STATUS for tables that use transient statistics (off by default)NUMERIC_MIN_VALUE NULLNUMERIC_MAX_VALUE NULLNUMERIC_BLOCK_SIZE NULLENUM_VALUE_LIST OFF,ONREAD_ONLY NOCOMMAND_LINE_ARGUMENT OPTIONALVARIABLE_NAME INNODB_STATS_PERSISTENTSESSION_VALUE NULLDEFAULT_VALUE ONVARIABLE_SCOPE GLOBALVARIABLE_TYPE BOOLEANVARIABLE_COMMENT InnoDB persistent statistics enabled for all tables unless overridden at table levelNUMERIC_MIN_VALUE NULLNUMERIC_MAX_VALUE NULLNUMERIC_BLOCK_SIZE NULLENUM_VALUE_LIST OFF,ONREAD_ONLY NOCOMMAND_LINE_ARGUMENT OPTIONALVARIABLE_NAME INNODB_STATS_PERSISTENT_SAMPLE_PAGESSESSION_VALUE NULLDEFAULT_VALUE 20VARIABLE_SCOPE GLOBALVARIABLE_TYPE BIGINT UNSIGNEDVARIABLE_COMMENT The number of leaf index pages to sample when calculating persistent statistics (by ANALYZE, default 20)NUMERIC_MIN_VALUE 1NUMERIC_MAX_VALUE 18446744073709551615NUMERIC_BLOCK_SIZE 0ENUM_VALUE_LIST NULLREAD_ONLY NOCOMMAND_LINE_ARGUMENT REQUIREDVARIABLE_NAME INNODB_STATS_TRADITIONALSESSION_VALUE NULLDEFAULT_VALUE ONVARIABLE_SCOPE GLOBALVARIABLE_TYPE BOOLEANVARIABLE_COMMENT Enable traditional statistic calculation based on number of configured pages (default true)NUMERIC_MIN_VALUE NULLNUMERIC_MAX_VALUE NULLNUMERIC_BLOCK_SIZE NULLENUM_VALUE_LIST OFF,ONREAD_ONLY NOCOMMAND_LINE_ARGUMENT REQUIREDVARIABLE_NAME INNODB_STATS_TRANSIENT_SAMPLE_PAGESSESSION_VALUE NULLDEFAULT_VALUE 8VARIABLE_SCOPE GLOBALVARIABLE_TYPE BIGINT UNSIGNEDVARIABLE_COMMENT The number of leaf index pages to sample when calculating transient statistics (if persistent statistics are not used, default 8)NUMERIC_MIN_VALUE 1NUMERIC_MAX_VALUE 18446744073709551615NUMERIC_BLOCK_SIZE 0ENUM_VALUE_LIST NULLREAD_ONLY NOCOMMAND_LINE_ARGUMENT REQUIREDVARIABLE_NAME INNODB_STATUS_OUTPUTSESSION_VALUE NULLDEFAULT_VALUE OFFVARIABLE_SCOPE GLOBALVARIABLE_TYPE BOOLEANVARIABLE_COMMENT Enable InnoDB monitor output to the error log.NUMERIC_MIN_VALUE NULLNUMERIC_MAX_VALUE NULLNUMERIC_BLOCK_SIZE NULLENUM_VALUE_LIST OFF,ONREAD_ONLY NOCOMMAND_LINE_ARGUMENT OPTIONALVARIABLE_NAME INNODB_STATUS_OUTPUT_LOCKSSESSION_VALUE NULLDEFAULT_VALUE OFFVARIABLE_SCOPE GLOBALVARIABLE_TYPE BOOLEANVARIABLE_COMMENT Enable InnoDB lock monitor output to the error log. Requires innodb_status_output=ON.NUMERIC_MIN_VALUE NULLNUMERIC_MAX_VALUE NULLNUMERIC_BLOCK_SIZE NULLENUM_VALUE_LIST OFF,ONREAD_ONLY NOCOMMAND_LINE_ARGUMENT OPTIONALVARIABLE_NAME INNODB_STRICT_MODESESSION_VALUE ONDEFAULT_VALUE ONVARIABLE_SCOPE SESSIONVARIABLE_TYPE BOOLEANVARIABLE_COMMENT Use strict mode when evaluating create options.NUMERIC_MIN_VALUE NULLNUMERIC_MAX_VALUE NULLNUMERIC_BLOCK_SIZE NULLENUM_VALUE_LIST OFF,ONREAD_ONLY NOCOMMAND_LINE_ARGUMENT OPTIONALVARIABLE_NAME INNODB_SYNC_ARRAY_SIZESESSION_VALUE NULLDEFAULT_VALUE 1VARIABLE_SCOPE GLOBALVARIABLE_TYPE BIGINT UNSIGNEDVARIABLE_COMMENT Size of the mutex/lock wait array.NUMERIC_MIN_VALUE 1NUMERIC_MAX_VALUE 1024NUMERIC_BLOCK_SIZE 0ENUM_VALUE_LIST NULLREAD_ONLY YESCOMMAND_LINE_ARGUMENT OPTIONALVARIABLE_NAME INNODB_SYNC_DEBUGSESSION_VALUE NULLDEFAULT_VALUE OFFVARIABLE_SCOPE GLOBALVARIABLE_TYPE BOOLEANVARIABLE_COMMENT Enable the sync debug checksNUMERIC_MIN_VALUE NULLNUMERIC_MAX_VALUE NULLNUMERIC_BLOCK_SIZE NULLENUM_VALUE_LIST OFF,ONREAD_ONLY YESCOMMAND_LINE_ARGUMENT OPTIONALVARIABLE_NAME INNODB_SYNC_SPIN_LOOPSSESSION_VALUE NULLDEFAULT_VALUE 30VARIABLE_SCOPE GLOBALVARIABLE_TYPE BIGINT UNSIGNEDVARIABLE_COMMENT Count of spin-loop rounds in InnoDB mutexes (30 by default)NUMERIC_MIN_VALUE 0NUMERIC_MAX_VALUE 18446744073709551615NUMERIC_BLOCK_SIZE 0ENUM_VALUE_LIST NULLREAD_ONLY NOCOMMAND_LINE_ARGUMENT REQUIREDVARIABLE_NAME INNODB_TABLE_LOCKSSESSION_VALUE ONDEFAULT_VALUE ONVARIABLE_SCOPE SESSIONVARIABLE_TYPE BOOLEANVARIABLE_COMMENT Enable InnoDB locking in LOCK TABLESNUMERIC_MIN_VALUE NULLNUMERIC_MAX_VALUE NULLNUMERIC_BLOCK_SIZE NULLENUM_VALUE_LIST OFF,ONREAD_ONLY NOCOMMAND_LINE_ARGUMENT OPTIONALVARIABLE_NAME INNODB_TEMP_DATA_FILE_PATHSESSION_VALUE NULLDEFAULT_VALUE ibtmp1:12M:autoextendVARIABLE_SCOPE GLOBALVARIABLE_TYPE VARCHARVARIABLE_COMMENT Path to files and their sizes making temp-tablespace.NUMERIC_MIN_VALUE NULLNUMERIC_MAX_VALUE NULLNUMERIC_BLOCK_SIZE NULLENUM_VALUE_LIST NULLREAD_ONLY YESCOMMAND_LINE_ARGUMENT REQUIREDVARIABLE_NAME INNODB_THREAD_CONCURRENCYSESSION_VALUE NULLDEFAULT_VALUE 0VARIABLE_SCOPE GLOBALVARIABLE_TYPE BIGINT UNSIGNEDVARIABLE_COMMENT Helps in performance tuning in heavily concurrent environments. Sets the maximum number of threads allowed inside InnoDB. Value 0 will disable the thread throttling.NUMERIC_MIN_VALUE 0NUMERIC_MAX_VALUE 1000NUMERIC_BLOCK_SIZE 0ENUM_VALUE_LIST NULLREAD_ONLY NOCOMMAND_LINE_ARGUMENT REQUIREDVARIABLE_NAME INNODB_THREAD_SLEEP_DELAYSESSION_VALUE NULLDEFAULT_VALUE 10000VARIABLE_SCOPE GLOBALVARIABLE_TYPE BIGINT UNSIGNEDVARIABLE_COMMENT Time of innodb thread sleeping before joining InnoDB queue (usec). Value 0 disable a sleepNUMERIC_MIN_VALUE 0NUMERIC_MAX_VALUE 1000000NUMERIC_BLOCK_SIZE 0ENUM_VALUE_LIST NULLREAD_ONLY NOCOMMAND_LINE_ARGUMENT REQUIREDVARIABLE_NAME INNODB_TMPDIRSESSION_VALUE DEFAULT_VALUE VARIABLE_SCOPE SESSIONVARIABLE_TYPE VARCHARVARIABLE_COMMENT Directory for temporary non-tablespace files.NUMERIC_MIN_VALUE NULLNUMERIC_MAX_VALUE NULLNUMERIC_BLOCK_SIZE NULLENUM_VALUE_LIST NULLREAD_ONLY NOCOMMAND_LINE_ARGUMENT OPTIONALVARIABLE_NAME INNODB_TRX_PURGE_VIEW_UPDATE_ONLY_DEBUGSESSION_VALUE NULLDEFAULT_VALUE OFFVARIABLE_SCOPE GLOBALVARIABLE_TYPE BOOLEANVARIABLE_COMMENT Pause actual purging any delete-marked records, but merely update the purge view. It is to create artificially the situation the purge view have been updated but the each purges were not done yet.NUMERIC_MIN_VALUE NULLNUMERIC_MAX_VALUE NULLNUMERIC_BLOCK_SIZE NULLENUM_VALUE_LIST OFF,ONREAD_ONLY NOCOMMAND_LINE_ARGUMENT NULLVARIABLE_NAME INNODB_TRX_RSEG_N_SLOTS_DEBUGSESSION_VALUE NULLDEFAULT_VALUE 0VARIABLE_SCOPE GLOBALVARIABLE_TYPE INT UNSIGNEDVARIABLE_COMMENT Debug flags for InnoDB to limit TRX_RSEG_N_SLOTS for trx_rsegf_undo_find_free()NUMERIC_MIN_VALUE 0NUMERIC_MAX_VALUE 1024NUMERIC_BLOCK_SIZE 0ENUM_VALUE_LIST NULLREAD_ONLY NOCOMMAND_LINE_ARGUMENT NULLVARIABLE_NAME INNODB_UNDO_DIRECTORYSESSION_VALUE NULLDEFAULT_VALUE VARIABLE_SCOPE GLOBALVARIABLE_TYPE VARCHARVARIABLE_COMMENT Directory where undo tablespace files live, this path can be absolute.NUMERIC_MIN_VALUE NULLNUMERIC_MAX_VALUE NULLNUMERIC_BLOCK_SIZE NULLENUM_VALUE_LIST NULLREAD_ONLY YESCOMMAND_LINE_ARGUMENT REQUIREDVARIABLE_NAME INNODB_UNDO_LOGSSESSION_VALUE NULLDEFAULT_VALUE 128VARIABLE_SCOPE GLOBALVARIABLE_TYPE BIGINT UNSIGNEDVARIABLE_COMMENT Deprecated parameter with no effect.NUMERIC_MIN_VALUE 0NUMERIC_MAX_VALUE 128NUMERIC_BLOCK_SIZE 0ENUM_VALUE_LIST NULLREAD_ONLY NOCOMMAND_LINE_ARGUMENT OPTIONALVARIABLE_NAME INNODB_UNDO_LOG_TRUNCATESESSION_VALUE NULLDEFAULT_VALUE OFFVARIABLE_SCOPE GLOBALVARIABLE_TYPE BOOLEANVARIABLE_COMMENT Enable or Disable Truncate of UNDO tablespace.NUMERIC_MIN_VALUE NULLNUMERIC_MAX_VALUE NULLNUMERIC_BLOCK_SIZE NULLENUM_VALUE_LIST OFF,ONREAD_ONLY NOCOMMAND_LINE_ARGUMENT OPTIONALVARIABLE_NAME INNODB_UNDO_TABLESPACESSESSION_VALUE NULLDEFAULT_VALUE 0VARIABLE_SCOPE GLOBALVARIABLE_TYPE BIGINT UNSIGNEDVARIABLE_COMMENT Number of undo tablespaces to use.NUMERIC_MIN_VALUE 0NUMERIC_MAX_VALUE 127NUMERIC_BLOCK_SIZE 0ENUM_VALUE_LIST NULLREAD_ONLY YESCOMMAND_LINE_ARGUMENT REQUIREDVARIABLE_NAME INNODB_USE_ATOMIC_WRITESSESSION_VALUE NULLDEFAULT_VALUE ONVARIABLE_SCOPE GLOBALVARIABLE_TYPE BOOLEANVARIABLE_COMMENT Enable atomic writes, instead of using the doublewrite buffer, for files on devices that supports atomic writes. To use this option one must use innodb_file_per_table=1, innodb_flush_method=O_DIRECT. This option only works on Linux with either FusionIO cards using the directFS filesystem or with Shannon cards using any file system.NUMERIC_MIN_VALUE NULLNUMERIC_MAX_VALUE NULLNUMERIC_BLOCK_SIZE NULLENUM_VALUE_LIST OFF,ONREAD_ONLY YESCOMMAND_LINE_ARGUMENT NONEVARIABLE_NAME INNODB_WRITE_IO_THREADSSESSION_VALUE NULLDEFAULT_VALUE 4VARIABLE_SCOPE GLOBALVARIABLE_TYPE BIGINT UNSIGNEDVARIABLE_COMMENT Number of background write I/O threads in InnoDB.NUMERIC_MIN_VALUE 1NUMERIC_MAX_VALUE 64NUMERIC_BLOCK_SIZE 0ENUM_VALUE_LIST NULLREAD_ONLY YESCOMMAND_LINE_ARGUMENT REQUIRED
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