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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
19 lines
505 B
Plaintext
19 lines
505 B
Plaintext
set global innodb_commit_concurrency=0;
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select @@innodb_commit_concurrency;
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@@innodb_commit_concurrency
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0
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set global innodb_commit_concurrency=1;
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ERROR HY000: Incorrect arguments to SET
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select @@innodb_commit_concurrency;
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@@innodb_commit_concurrency
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0
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set global innodb_commit_concurrency=42;
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ERROR HY000: Incorrect arguments to SET
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select @@innodb_commit_concurrency;
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@@innodb_commit_concurrency
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0
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set global innodb_commit_concurrency=0;
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select @@innodb_commit_concurrency;
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@@innodb_commit_concurrency
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0
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