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mariadb/mysql-test/innodb_bug42101.result

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branches/zip: Merge revisions 4976:4994 from branches/5.1: ------------------------------------------------------------------------ r4994 | marko | 2009-05-14 15:04:55 +0300 (Thu, 14 May 2009) | 18 lines branches/5.1: Prevent a race condition in innobase_commit() by ensuring that innodb_commit_concurrency>0 remains constant at run time. (Bug #42101) srv_commit_concurrency: Make this a static variable in ha_innodb.cc. innobase_commit_concurrency_validate(): Check that innodb_commit_concurrency is not changed from or to 0 at run time. This is needed, because innobase_commit() assumes that innodb_commit_concurrency>0 remains constant. Without this limitation, the checks for innodb_commit_concurrency>0 in innobase_commit() should be removed and that function would have to acquire and release commit_cond_m at least twice per invocation. Normally, innodb_commit_concurrency=0, and introducing the mutex operations would mean significant overhead. innodb_bug42101.test, innodb_bug42101-nonzero.test: Test cases. rb://123 approved by Heikki Tuuri ------------------------------------------------------------------------
17 years ago
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branches/zip: Fix a race condition caused by SET GLOBAL innodb_commit_concurrency=DEFAULT. (Bug #45749) When innodb_commit_concurrency is initially set nonzero, DEFAULT would change it back to 0, triggering Bug #42101. rb://139 approved by Heikki Tuuri.
17 years ago
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  1. set global innodb_commit_concurrency=0;
  2. select @@innodb_commit_concurrency;
  3. @@innodb_commit_concurrency
  4. 0
  5. set global innodb_commit_concurrency=1;
  6. ERROR HY000: Incorrect arguments to SET
  7. select @@innodb_commit_concurrency;
  8. @@innodb_commit_concurrency
  9. 0
  10. set global innodb_commit_concurrency=42;
  11. ERROR HY000: Incorrect arguments to SET
  12. select @@innodb_commit_concurrency;
  13. @@innodb_commit_concurrency
  14. 0
  15. set global innodb_commit_concurrency=0;
  16. select @@innodb_commit_concurrency;
  17. @@innodb_commit_concurrency
  18. 0
  19. set global innodb_commit_concurrency=DEFAULT;
  20. select @@innodb_commit_concurrency;
  21. @@innodb_commit_concurrency
  22. 0