Query the thread information of MySQL server (detailed explanation)

-- see MySQL Running time after this startup ( Company ： second )
show status like 'uptime';

-- see select The number of statements executed 
show [global] status like 'com_select';

-- see insert The number of statements executed 
show [global] status like 'com_insert';

-- see update The number of statements executed 
show [global] status like 'com_update';

-- see delete The number of statements executed 
show [global] status like 'com_delete';

-- View attempts to connect to MySQL( Whether the connection is successful or not ) Connection number 
show status like 'connections';

-- View the number of threads in the thread cache .
show status like 'threads_cached';

-- View the number of currently open connections .
show status like 'threads_connected';

-- View the number of currently open connections .
show status like 'threads_connected';

-- View the number of threads created to process connections . If Threads_created more , You may want to increase thread_cache_size value .
show status like 'threads_created';

-- View the active ( Non sleep state ) Number of threads .
show status like 'threads_running';

-- View the number of times the table's locks are acquired immediately .
show status like 'table_locks_immediate';

-- Number of times to view locks on tables that cannot be obtained immediately . If the value is high , And there are performance problems , You should first optimize the query , Then split the table or use replication .
show status like 'table_locks_waited';

-- View created more than slow_launch_time Number of threads per second .
show status like 'slow_launch_threads';

-- View query time exceeds long_query_time Number of queries per second .
show status like 'slow_queries';

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