MDEV-25325 built-in documentation for performance_schema tables
Improve documentation of performance_schema tables by appending COLUMN
comments to tables. Additionally improve test coverage and update corresponding
tests.
This is part of the patch covering newer columns and tables in 10.5.
ERROR 42000: SELECT, LOCK TABLES command denied to user 'root'@'localhost' for table 'metadata_locks'
UNLOCK TABLES;
#
# MDEV-25325 column_comment for performance_shcema tables
#
select column_name, column_comment
from information_schema.columns
where table_schema='performance_schema' and table_name='metadata_locks';
column_name column_comment
OBJECT_TYPE Object type. One of BACKUP, COMMIT, EVENT, FUNCTION, GLOBAL, LOCKING SERVICE, PROCEDURE, SCHEMA, TABLE, TABLESPACE, TRIGGER (unused) or USER LEVEL LOCK.
OBJECT_SCHEMA Object schema.
OBJECT_NAME Object name.
OBJECT_INSTANCE_BEGIN Address in memory of the instrumented object.
LOCK_TYPE Lock type. One of BACKUP_FTWRL1, BACKUP_START, BACKUP_TRANS_DML, EXCLUSIVE, INTENTION_EXCLUSIVE, SHARED, SHARED_HIGH_PRIO, SHARED_NO_READ_WRITE, SHARED_NO_WRITE, SHARED_READ, SHARED_UPGRADABLE or SHARED_WRITE.
LOCK_DURATION Lock duration. One of EXPLICIT (locks released by explicit action, for example a global lock acquired with FLUSH TABLES WITH READ LOCK) , STATEMENT (locks implicitly released at statement end) or TRANSACTION (locks implicitly released at transaction end).
LOCK_STATUS Lock status. One of GRANTED, KILLED, PENDING, POST_RELEASE_NOTIFY, PRE_ACQUIRE_NOTIFY, TIMEOUT or VICTIM.
SOURCE Source file containing the instrumented code that produced the event, as well as the line number where the instrumentation occurred. This allows one to examine the source code involved.
ERROR 42000: SELECT, LOCK TABLES command denied to user 'root'@'localhost' for table 'replication_applier_status_by_worker'
UNLOCK TABLES;
#
# MDEV-25325 column_comment for performance_shcema tables
#
select column_name, column_comment
from information_schema.columns
where table_schema='performance_schema' and table_name='replication_applier_status_by_worker';
column_name column_comment
CHANNEL_NAME Name of replication channel through which the transaction is received.
THREAD_ID Thread_Id as displayed in the performance_schema.threads table for thread with name 'thread/sql/rpl_parallel_thread'. THREAD_ID will be NULL when worker threads are stopped due to error/force stop.
SERVICE_STATE Whether or not the thread is running.
LAST_SEEN_TRANSACTION Last GTID executed by worker
LAST_ERROR_NUMBER Last Error that occurred on a particular worker.
LAST_ERROR_MESSAGE Last error specific message.
LAST_ERROR_TIMESTAMP Time stamp of last error.
WORKER_IDLE_TIME Total idle time in seconds that the worker thread has spent waiting for work from SQL thread.
LAST_TRANS_RETRY_COUNT Total number of retries attempted by last transaction.
`OBJECT_INSTANCE_BEGIN` bigint(20) unsigned NOT NULL COMMENT 'Address in memory of the instrumented object.',
`LOCK_TYPE` varchar(32) NOT NULL COMMENT 'Lock type. One of BACKUP_FTWRL1, BACKUP_START, BACKUP_TRANS_DML, EXCLUSIVE, INTENTION_EXCLUSIVE, SHARED, SHARED_HIGH_PRIO, SHARED_NO_READ_WRITE, SHARED_NO_WRITE, SHARED_READ, SHARED_UPGRADABLE or SHARED_WRITE.',
`LOCK_DURATION` varchar(32) NOT NULL COMMENT 'Lock duration. One of EXPLICIT (locks released by explicit action, for example a global lock acquired with FLUSH TABLES WITH READ LOCK) , STATEMENT (locks implicitly released at statement end) or TRANSACTION (locks implicitly released at transaction end).',
`LOCK_STATUS` varchar(32) NOT NULL COMMENT 'Lock status. One of GRANTED, KILLED, PENDING, POST_RELEASE_NOTIFY, PRE_ACQUIRE_NOTIFY, TIMEOUT or VICTIM.',
`SOURCE` varchar(64) DEFAULT NULL COMMENT 'Source file containing the instrumented code that produced the event, as well as the line number where the instrumentation occurred. This allows one to examine the source code involved.',
`OWNER_THREAD_ID` bigint(20) unsigned DEFAULT NULL COMMENT 'Thread that requested the lock.',
`OWNER_EVENT_ID` bigint(20) unsigned DEFAULT NULL COMMENT 'Event that requested the lock.'
def performance_schema host_cache LAST_SEEN 27 '0000-00-00 00:00:00' NO timestamp NULL NULL NULL NULL 0 NULL NULL timestamp select,insert,update,references Timestamp of the most recent connection attempt by the IP. NEVER NULL
def performance_schema host_cache FIRST_ERROR_SEEN 28 '0000-00-00 00:00:00' YES timestamp NULL NULL NULL NULL 0 NULL NULL timestamp select,insert,update,references Timestamp of the first error seen from the IP. NEVER NULL
def performance_schema host_cache LAST_ERROR_SEEN 29 '0000-00-00 00:00:00' YES timestamp NULL NULL NULL NULL 0 NULL NULL timestamp select,insert,update,references Timestamp of the most recent error seen from the IP. NEVER NULL
def performance_schema memory_summary_by_account_by_event_name USER 1 NULL YES char 32 96 NULL NULL NULL utf8 utf8_bin char(32) select,insert,update,references NEVER NULL
def performance_schema memory_summary_by_account_by_event_name USER 1 NULL YES char 32 96 NULL NULL NULL utf8 utf8_bin char(32) select,insert,update,references User portion of the account. NEVER NULL
def performance_schema memory_summary_by_account_by_event_name HOST 2 NULL YES char 60 180 NULL NULL NULL utf8 utf8_bin char(60) select,insert,update,references Host portion of the account. NEVER NULL
def performance_schema memory_summary_by_account_by_event_name COUNT_ALLOC 4 NULL NO bigint NULL NULL 20 0 NULL NULL NULL bigint(20) unsigned select,insert,update,references Total number of allocations to memory. NEVER NULL
def performance_schema memory_summary_by_account_by_event_name COUNT_FREE 5 NULL NO bigint NULL NULL 20 0 NULL NULL NULL bigint(20) unsigned select,insert,update,references Total number of attempts to free the allocated memory. NEVER NULL
def performance_schema memory_summary_by_account_by_event_name SUM_NUMBER_OF_BYTES_ALLOC 6 NULL NO bigint NULL NULL 20 0 NULL NULL NULL bigint(20) unsigned select,insert,update,references Total number of bytes allocated. NEVER NULL
def performance_schema memory_summary_by_account_by_event_name SUM_NUMBER_OF_BYTES_FREE 7 NULL NO bigint NULL NULL 20 0 NULL NULL NULL bigint(20) unsigned select,insert,update,references Total number of bytes freed NEVER NULL
def performance_schema memory_summary_by_account_by_event_name LOW_COUNT_USED 8 NULL NO bigint NULL NULL 19 0 NULL NULL NULL bigint(20) select,insert,update,references Lowest number of allocated blocks (lowest value of CURRENT_COUNT_USED). NEVER NULL
def performance_schema memory_summary_by_account_by_event_name CURRENT_COUNT_USED 9 NULL NO bigint NULL NULL 19 0 NULL NULL NULL bigint(20) select,insert,update,references Currently allocated blocks that have not been freed (COUNT_ALLOC minus COUNT_FREE). NEVER NULL
def performance_schema memory_summary_by_account_by_event_name HIGH_COUNT_USED 10 NULL NO bigint NULL NULL 19 0 NULL NULL NULL bigint(20) select,insert,update,references Highest number of allocated blocks (highest value of CURRENT_COUNT_USED). NEVER NULL
def performance_schema memory_summary_by_account_by_event_name LOW_NUMBER_OF_BYTES_USED 11 NULL NO bigint NULL NULL 19 0 NULL NULL NULL bigint(20) select,insert,update,references Lowest number of bytes used. NEVER NULL
def performance_schema memory_summary_by_account_by_event_name CURRENT_NUMBER_OF_BYTES_USED 12 NULL NO bigint NULL NULL 19 0 NULL NULL NULL bigint(20) select,insert,update,references Current number of bytes used (total allocated minus total freed). NEVER NULL
def performance_schema memory_summary_by_account_by_event_name HIGH_NUMBER_OF_BYTES_USED 13 NULL NO bigint NULL NULL 19 0 NULL NULL NULL bigint(20) select,insert,update,references Highest number of bytes used. NEVER NULL
def performance_schema memory_summary_by_host_by_event_name HOST 1 NULL YES char 60 180 NULL NULL NULL utf8 utf8_bin char(60) select,insert,update,references Host portion of the account. NEVER NULL
def performance_schema memory_summary_by_host_by_event_name COUNT_ALLOC 3 NULL NO bigint NULL NULL 20 0 NULL NULL NULL bigint(20) unsigned select,insert,update,references Total number of allocations to memory. NEVER NULL
def performance_schema memory_summary_by_host_by_event_name COUNT_FREE 4 NULL NO bigint NULL NULL 20 0 NULL NULL NULL bigint(20) unsigned select,insert,update,references Total number of attempts to free the allocated memory. NEVER NULL
def performance_schema memory_summary_by_host_by_event_name SUM_NUMBER_OF_BYTES_ALLOC 5 NULL NO bigint NULL NULL 20 0 NULL NULL NULL bigint(20) unsigned select,insert,update,references Total number of bytes allocated. NEVER NULL
def performance_schema memory_summary_by_host_by_event_name SUM_NUMBER_OF_BYTES_FREE 6 NULL NO bigint NULL NULL 20 0 NULL NULL NULL bigint(20) unsigned select,insert,update,references Total number of bytes freed NEVER NULL
def performance_schema memory_summary_by_host_by_event_name LOW_COUNT_USED 7 NULL NO bigint NULL NULL 19 0 NULL NULL NULL bigint(20) select,insert,update,references Lowest number of allocated blocks (lowest value of CURRENT_COUNT_USED). NEVER NULL
def performance_schema memory_summary_by_host_by_event_name CURRENT_COUNT_USED 8 NULL NO bigint NULL NULL 19 0 NULL NULL NULL bigint(20) select,insert,update,references Currently allocated blocks that have not been freed (COUNT_ALLOC minus COUNT_FREE). NEVER NULL
def performance_schema memory_summary_by_host_by_event_name HIGH_COUNT_USED 9 NULL NO bigint NULL NULL 19 0 NULL NULL NULL bigint(20) select,insert,update,references Highest number of allocated blocks (highest value of CURRENT_COUNT_USED). NEVER NULL
def performance_schema memory_summary_by_host_by_event_name LOW_NUMBER_OF_BYTES_USED 10 NULL NO bigint NULL NULL 19 0 NULL NULL NULL bigint(20) select,insert,update,references Lowest number of bytes used. NEVER NULL
def performance_schema memory_summary_by_host_by_event_name CURRENT_NUMBER_OF_BYTES_USED 11 NULL NO bigint NULL NULL 19 0 NULL NULL NULL bigint(20) select,insert,update,references Current number of bytes used (total allocated minus total freed). NEVER NULL
def performance_schema memory_summary_by_host_by_event_name HIGH_NUMBER_OF_BYTES_USED 12 NULL NO bigint NULL NULL 19 0 NULL NULL NULL bigint(20) select,insert,update,references Highest number of bytes used. NEVER NULL
def performance_schema memory_summary_by_thread_by_event_name COUNT_ALLOC 3 NULL NO bigint NULL NULL 20 0 NULL NULL NULL bigint(20) unsigned select,insert,update,references Total number of allocations to memory. NEVER NULL
def performance_schema memory_summary_by_thread_by_event_name COUNT_FREE 4 NULL NO bigint NULL NULL 20 0 NULL NULL NULL bigint(20) unsigned select,insert,update,references Total number of attempts to free the allocated memory. NEVER NULL
def performance_schema memory_summary_by_thread_by_event_name SUM_NUMBER_OF_BYTES_ALLOC 5 NULL NO bigint NULL NULL 20 0 NULL NULL NULL bigint(20) unsigned select,insert,update,references Total number of bytes allocated. NEVER NULL
def performance_schema memory_summary_by_thread_by_event_name SUM_NUMBER_OF_BYTES_FREE 6 NULL NO bigint NULL NULL 20 0 NULL NULL NULL bigint(20) unsigned select,insert,update,references Total number of bytes freed NEVER NULL
def performance_schema memory_summary_by_thread_by_event_name LOW_COUNT_USED 7 NULL NO bigint NULL NULL 19 0 NULL NULL NULL bigint(20) select,insert,update,references Lowest number of allocated blocks (lowest value of CURRENT_COUNT_USED). NEVER NULL
def performance_schema memory_summary_by_thread_by_event_name CURRENT_COUNT_USED 8 NULL NO bigint NULL NULL 19 0 NULL NULL NULL bigint(20) select,insert,update,references Currently allocated blocks that have not been freed (COUNT_ALLOC minus COUNT_FREE). NEVER NULL
def performance_schema memory_summary_by_thread_by_event_name HIGH_COUNT_USED 9 NULL NO bigint NULL NULL 19 0 NULL NULL NULL bigint(20) select,insert,update,references Highest number of allocated blocks (highest value of CURRENT_COUNT_USED). NEVER NULL
def performance_schema memory_summary_by_thread_by_event_name LOW_NUMBER_OF_BYTES_USED 10 NULL NO bigint NULL NULL 19 0 NULL NULL NULL bigint(20) select,insert,update,references Lowest number of bytes used. NEVER NULL
def performance_schema memory_summary_by_thread_by_event_name CURRENT_NUMBER_OF_BYTES_USED 11 NULL NO bigint NULL NULL 19 0 NULL NULL NULL bigint(20) select,insert,update,references Current number of bytes used (total allocated minus total freed). NEVER NULL
def performance_schema memory_summary_by_thread_by_event_name HIGH_NUMBER_OF_BYTES_USED 12 NULL NO bigint NULL NULL 19 0 NULL NULL NULL bigint(20) select,insert,update,references Highest number of bytes used. NEVER NULL
def performance_schema memory_summary_by_user_by_event_name USER 1 NULL YES char 32 96 NULL NULL NULL utf8 utf8_bin char(32) select,insert,update,references User portion of the account. NEVER NULL
def performance_schema memory_summary_by_user_by_event_name COUNT_ALLOC 3 NULL NO bigint NULL NULL 20 0 NULL NULL NULL bigint(20) unsigned select,insert,update,references Total number of allocations to memory. NEVER NULL
def performance_schema memory_summary_by_user_by_event_name COUNT_FREE 4 NULL NO bigint NULL NULL 20 0 NULL NULL NULL bigint(20) unsigned select,insert,update,references Total number of attempts to free the allocated memory. NEVER NULL
def performance_schema memory_summary_by_user_by_event_name SUM_NUMBER_OF_BYTES_ALLOC 5 NULL NO bigint NULL NULL 20 0 NULL NULL NULL bigint(20) unsigned select,insert,update,references Total number of bytes allocated. NEVER NULL
def performance_schema memory_summary_by_user_by_event_name SUM_NUMBER_OF_BYTES_FREE 6 NULL NO bigint NULL NULL 20 0 NULL NULL NULL bigint(20) unsigned select,insert,update,references Total number of bytes freed NEVER NULL
def performance_schema memory_summary_by_user_by_event_name LOW_COUNT_USED 7 NULL NO bigint NULL NULL 19 0 NULL NULL NULL bigint(20) select,insert,update,references Lowest number of allocated blocks (lowest value of CURRENT_COUNT_USED). NEVER NULL
def performance_schema memory_summary_by_user_by_event_name CURRENT_COUNT_USED 8 NULL NO bigint NULL NULL 19 0 NULL NULL NULL bigint(20) select,insert,update,references Currently allocated blocks that have not been freed (COUNT_ALLOC minus COUNT_FREE). NEVER NULL
def performance_schema memory_summary_by_user_by_event_name HIGH_COUNT_USED 9 NULL NO bigint NULL NULL 19 0 NULL NULL NULL bigint(20) select,insert,update,references Highest number of allocated blocks (highest value of CURRENT_COUNT_USED). NEVER NULL
def performance_schema memory_summary_by_user_by_event_name LOW_NUMBER_OF_BYTES_USED 10 NULL NO bigint NULL NULL 19 0 NULL NULL NULL bigint(20) select,insert,update,references Lowest number of bytes used. NEVER NULL
def performance_schema memory_summary_by_user_by_event_name CURRENT_NUMBER_OF_BYTES_USED 11 NULL NO bigint NULL NULL 19 0 NULL NULL NULL bigint(20) select,insert,update,references Current number of bytes used (total allocated minus total freed). NEVER NULL
def performance_schema memory_summary_by_user_by_event_name HIGH_NUMBER_OF_BYTES_USED 12 NULL NO bigint NULL NULL 19 0 NULL NULL NULL bigint(20) select,insert,update,references Highest number of bytes used. NEVER NULL
def performance_schema memory_summary_global_by_event_name COUNT_ALLOC 2 NULL NO bigint NULL NULL 20 0 NULL NULL NULL bigint(20) unsigned select,insert,update,references Total number of allocations to memory. NEVER NULL
def performance_schema memory_summary_global_by_event_name COUNT_FREE 3 NULL NO bigint NULL NULL 20 0 NULL NULL NULL bigint(20) unsigned select,insert,update,references Total number of attempts to free the allocated memory. NEVER NULL
def performance_schema memory_summary_global_by_event_name SUM_NUMBER_OF_BYTES_ALLOC 4 NULL NO bigint NULL NULL 20 0 NULL NULL NULL bigint(20) unsigned select,insert,update,references Total number of bytes allocated. NEVER NULL
def performance_schema memory_summary_global_by_event_name SUM_NUMBER_OF_BYTES_FREE 5 NULL NO bigint NULL NULL 20 0 NULL NULL NULL bigint(20) unsigned select,insert,update,references Total number of bytes freed NEVER NULL
def performance_schema memory_summary_global_by_event_name LOW_COUNT_USED 6 NULL NO bigint NULL NULL 19 0 NULL NULL NULL bigint(20) select,insert,update,references Lowest number of allocated blocks (lowest value of CURRENT_COUNT_USED). NEVER NULL
def performance_schema memory_summary_global_by_event_name CURRENT_COUNT_USED 7 NULL NO bigint NULL NULL 19 0 NULL NULL NULL bigint(20) select,insert,update,references Currently allocated blocks that have not been freed (COUNT_ALLOC minus COUNT_FREE). NEVER NULL
def performance_schema memory_summary_global_by_event_name HIGH_COUNT_USED 8 NULL NO bigint NULL NULL 19 0 NULL NULL NULL bigint(20) select,insert,update,references Highest number of allocated blocks (highest value of CURRENT_COUNT_USED). NEVER NULL
def performance_schema memory_summary_global_by_event_name LOW_NUMBER_OF_BYTES_USED 9 NULL NO bigint NULL NULL 19 0 NULL NULL NULL bigint(20) select,insert,update,references Lowest number of bytes used. NEVER NULL
def performance_schema memory_summary_global_by_event_name CURRENT_NUMBER_OF_BYTES_USED 10 NULL NO bigint NULL NULL 19 0 NULL NULL NULL bigint(20) select,insert,update,references Current number of bytes used (total allocated minus total freed). NEVER NULL
def performance_schema memory_summary_global_by_event_name HIGH_NUMBER_OF_BYTES_USED 11 NULL NO bigint NULL NULL 19 0 NULL NULL NULL bigint(20) select,insert,update,references Highest number of bytes used. NEVER NULL
def performance_schema metadata_locks OBJECT_TYPE 1 NULL NO varchar 64 192 NULL NULL NULL utf8 utf8_general_ci varchar(64) select,insert,update,references Object type. One of BACKUP, COMMIT, EVENT, FUNCTION, GLOBAL, LOCKING SERVICE, PROCEDURE, SCHEMA, TABLE, TABLESPACE, TRIGGER (unused) or USER LEVEL LOCK. NEVER NULL
def performance_schema metadata_locks OBJECT_INSTANCE_BEGIN 4 NULL NO bigint NULL NULL 20 0 NULL NULL NULL bigint(20) unsigned select,insert,update,references Address in memory of the instrumented object. NEVER NULL
def performance_schema metadata_locks LOCK_TYPE 5 NULL NO varchar 32 96 NULL NULL NULL utf8 utf8_general_ci varchar(32) select,insert,update,references Lock type. One of BACKUP_FTWRL1, BACKUP_START, BACKUP_TRANS_DML, EXCLUSIVE, INTENTION_EXCLUSIVE, SHARED, SHARED_HIGH_PRIO, SHARED_NO_READ_WRITE, SHARED_NO_WRITE, SHARED_READ, SHARED_UPGRADABLE or SHARED_WRITE. NEVER NULL
def performance_schema metadata_locks LOCK_DURATION 6 NULL NO varchar 32 96 NULL NULL NULL utf8 utf8_general_ci varchar(32) select,insert,update,references Lock duration. One of EXPLICIT (locks released by explicit action, for example a global lock acquired with FLUSH TABLES WITH READ LOCK) , STATEMENT (locks implicitly released at statement end) or TRANSACTION (locks implicitly released at transaction end). NEVER NULL
def performance_schema metadata_locks LOCK_STATUS 7 NULL NO varchar 32 96 NULL NULL NULL utf8 utf8_general_ci varchar(32) select,insert,update,references Lock status. One of GRANTED, KILLED, PENDING, POST_RELEASE_NOTIFY, PRE_ACQUIRE_NOTIFY, TIMEOUT or VICTIM. NEVER NULL
def performance_schema metadata_locks SOURCE 8 NULL YES varchar 64 192 NULL NULL NULL utf8 utf8_general_ci varchar(64) select,insert,update,references Source file containing the instrumented code that produced the event, as well as the line number where the instrumentation occurred. This allows one to examine the source code involved. NEVER NULL
def performance_schema metadata_locks OWNER_THREAD_ID 9 NULL YES bigint NULL NULL 20 0 NULL NULL NULL bigint(20) unsigned select,insert,update,references Thread that requested the lock. NEVER NULL
def performance_schema metadata_locks OWNER_EVENT_ID 10 NULL YES bigint NULL NULL 20 0 NULL NULL NULL bigint(20) unsigned select,insert,update,references Event that requested the lock. NEVER NULL
def performance_schema mutex_instances NAME 1 NULL NO varchar 128 384 NULL NULL NULL utf8 utf8_general_ci varchar(128) select,insert,update,references Instrument name associated with the mutex. NEVER NULL
def performance_schema mutex_instances OBJECT_INSTANCE_BEGIN 2 NULL NO bigint NULL NULL 20 0 NULL NULL NULL bigint(20) unsigned select,insert,update,references Memory address of the instrumented mutex. NEVER NULL
def performance_schema mutex_instances LOCKED_BY_THREAD_ID 3 NULL YES bigint NULL NULL 20 0 NULL NULL NULL bigint(20) unsigned select,insert,update,references The THREAD_ID of the locking thread if a thread has a mutex locked, otherwise NULL. NEVER NULL
@ -1193,4 +1193,4 @@ select count(*) from information_schema.columns
where table_schema="performance_schema"
and (column_comment is null or column_comment = '');
"OBJECT_INSTANCE_BEGIN BIGINT unsigned not null comment 'Address in memory of the instrumented object.',"
"LOCK_TYPE VARCHAR(32) not null comment 'Lock type. One of BACKUP_FTWRL1, BACKUP_START, BACKUP_TRANS_DML, EXCLUSIVE, INTENTION_EXCLUSIVE, SHARED, SHARED_HIGH_PRIO, SHARED_NO_READ_WRITE, SHARED_NO_WRITE, SHARED_READ, SHARED_UPGRADABLE or SHARED_WRITE.',"
"LOCK_DURATION VARCHAR(32) not null comment 'Lock duration. One of EXPLICIT (locks released by explicit action, for example a global lock acquired with FLUSH TABLES WITH READ LOCK) , STATEMENT (locks implicitly released at statement end) or TRANSACTION (locks implicitly released at transaction end).',"
"LOCK_STATUS VARCHAR(32) not null comment 'Lock status. One of GRANTED, KILLED, PENDING, POST_RELEASE_NOTIFY, PRE_ACQUIRE_NOTIFY, TIMEOUT or VICTIM.',"
"SOURCE VARCHAR(64) comment 'Source file containing the instrumented code that produced the event, as well as the line number where the instrumentation occurred. This allows one to examine the source code involved.',"
"OWNER_THREAD_ID BIGINT unsigned comment 'Thread that requested the lock.',"
"OWNER_EVENT_ID BIGINT unsigned comment 'Event that requested the lock.')")},
"CHANNEL_NAME CHAR(64) collate utf8_general_ci not null,"
"WORKER_ID BIGINT UNSIGNED not null,"
"THREAD_ID BIGINT UNSIGNED,"
"SERVICE_STATE ENUM('ON','OFF') not null,"
"LAST_SEEN_TRANSACTION CHAR(57) not null,"
"LAST_ERROR_NUMBER INTEGER not null,"
"LAST_ERROR_MESSAGE VARCHAR(1024) not null,"
"LAST_ERROR_TIMESTAMP TIMESTAMP(0) not null)")},
"CHANNEL_NAME CHAR(64) collate utf8_general_ci not null comment 'Name of replication channel through which the transaction is received.',"
"WORKER_ID BIGINT UNSIGNED not null comment 'Worker identifier.,"
"THREAD_ID BIGINT UNSIGNED comment 'Thread_Id as displayed in the performance_schema.threads table for thread with name ''thread/sql/rpl_parallel_thread''. THREAD_ID will be NULL when worker threads are stopped due to error/force stop.',"
"SERVICE_STATE ENUM('ON','OFF') not null comment 'Whether or not the thread is running.',"
"LAST_SEEN_TRANSACTION CHAR(57) not null comment 'Last GTID executed by worker',"
"LAST_ERROR_NUMBER INTEGER not null comment 'Last Error that occurred on a particular worker.',"
"LAST_ERROR_MESSAGE VARCHAR(1024) not null comment 'Last error specific message.',"
"LAST_ERROR_TIMESTAMP TIMESTAMP(0) not null comment 'Time stamp of last error.')")},
Haidong Ji
4 years ago
Vicențiu Ciorbaru