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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.
36 lines
1.6 KiB
Plaintext
36 lines
1.6 KiB
Plaintext
select * from performance_schema.hosts
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limit 1;
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select * from performance_schema.hosts
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where host='FOO';
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insert into performance_schema.hosts
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set host='FOO',
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current_connections=1, total_connections=2;
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ERROR 42000: INSERT command denied to user 'root'@'localhost' for table 'hosts'
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update performance_schema.hosts
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set current_connections=12;
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ERROR 42000: UPDATE command denied to user 'root'@'localhost' for table 'hosts'
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update performance_schema.hosts
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set current_connections=12 where host like "FOO";
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ERROR 42000: UPDATE command denied to user 'root'@'localhost' for table 'hosts'
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delete from performance_schema.hosts
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where total_connections=1;
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ERROR 42000: DELETE command denied to user 'root'@'localhost' for table 'hosts'
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delete from performance_schema.hosts;
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ERROR 42000: DELETE command denied to user 'root'@'localhost' for table 'hosts'
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LOCK TABLES performance_schema.hosts READ;
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ERROR 42000: SELECT, LOCK TABLES command denied to user 'root'@'localhost' for table 'hosts'
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UNLOCK TABLES;
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LOCK TABLES performance_schema.hosts WRITE;
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ERROR 42000: SELECT, LOCK TABLES command denied to user 'root'@'localhost' for table 'hosts'
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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='hosts';
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column_name column_comment
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HOST Host name used by the client to connect, NULL for internal threads or user sessions that failed to authenticate.
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CURRENT_CONNECTIONS Current number of the host's connections.
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TOTAL_CONNECTIONS Total number of the host's connections
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