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1cc7befc14
MDEV-7399: Add support for INFORMATION_SCHEMA.INNODB_MUTEXES
MDEV-7618: Improve semaphore instrumentation
Introduced two new information schema tables to monitor mutex waits
and semaphore waits. Added a new configuration variable
innodb_intrument_semaphores to add thread_id, file name and
line of current holder of mutex/rw_lock.
46 lines
1.4 KiB
Plaintext
46 lines
1.4 KiB
Plaintext
#
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# innodb_instrument_semaphores
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#
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# save the initial value
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SET @innodb_instrument_semaphores_global_saved = @@global.innodb_instrument_semaphores;
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# default
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SELECT @@global.innodb_instrument_semaphores;
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@@global.innodb_instrument_semaphores
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0
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# scope
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SELECT @@session.innodb_instrument_semaphores;
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ERROR HY000: Variable 'innodb_instrument_semaphores' is a GLOBAL variable
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SET @@global.innodb_instrument_semaphores=OFF;
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SELECT @@global.innodb_instrument_semaphores;
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@@global.innodb_instrument_semaphores
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0
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SET @@global.innodb_instrument_semaphores=ON;
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SELECT @@global.innodb_instrument_semaphores;
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@@global.innodb_instrument_semaphores
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1
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# valid values
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SET @@global.innodb_instrument_semaphores='OFF';
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SELECT @@global.innodb_instrument_semaphores;
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@@global.innodb_instrument_semaphores
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0
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SET @@global.innodb_instrument_semaphores=ON;
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SELECT @@global.innodb_instrument_semaphores;
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@@global.innodb_instrument_semaphores
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1
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SET @@global.innodb_instrument_semaphores=default;
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SELECT @@global.innodb_instrument_semaphores;
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@@global.innodb_instrument_semaphores
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0
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# invalid values
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SET @@global.innodb_instrument_semaphores=NULL;
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ERROR 42000: Variable 'innodb_instrument_semaphores' can't be set to the value of 'NULL'
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SET @@global.innodb_instrument_semaphores='junk';
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ERROR 42000: Variable 'innodb_instrument_semaphores' can't be set to the value of 'junk'
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# restore the initial value
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SET @@global.innodb_instrument_semaphores = @innodb_instrument_semaphores_global_saved;
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# End of test
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