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528abc749e
Improve documentation of performance_schema tables by appending COLUMN comments to tables. Additionally improve test coverage and update corresponding tests.
31 lines
1.6 KiB
Text
31 lines
1.6 KiB
Text
select * from performance_schema.rwlock_instances limit 1;
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select * from performance_schema.rwlock_instances
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where name='FOO';
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insert into performance_schema.rwlock_instances
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set name='FOO', object_instance_begin=12;
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ERROR 42000: INSERT command denied to user 'root'@'localhost' for table 'rwlock_instances'
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update performance_schema.rwlock_instances
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set name='FOO';
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ERROR 42000: UPDATE command denied to user 'root'@'localhost' for table 'rwlock_instances'
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delete from performance_schema.rwlock_instances
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where name like "wait/%";
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ERROR 42000: DELETE command denied to user 'root'@'localhost' for table 'rwlock_instances'
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delete from performance_schema.rwlock_instances;
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ERROR 42000: DELETE command denied to user 'root'@'localhost' for table 'rwlock_instances'
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LOCK TABLES performance_schema.rwlock_instances READ;
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ERROR 42000: SELECT, LOCK TABLES command denied to user 'root'@'localhost' for table 'rwlock_instances'
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UNLOCK TABLES;
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LOCK TABLES performance_schema.rwlock_instances WRITE;
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ERROR 42000: SELECT, LOCK TABLES command denied to user 'root'@'localhost' for table 'rwlock_instances'
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UNLOCK TABLES;
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#
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# MDEV-25325 column_comment for performance_schema tables
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#
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select column_name, column_comment
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from information_schema.columns
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where table_schema='performance_schema' and table_name='rwlock_instances';
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column_name column_comment
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NAME Instrument name associated with the read write lock
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OBJECT_INSTANCE_BEGIN Address in memory of the instrumented lock
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WRITE_LOCKED_BY_THREAD_ID THREAD_ID of the locking thread if locked in write (exclusive) mode, otherwise NULL.
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READ_LOCKED_BY_COUNT Count of current read locks held
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