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This article introduces the relevant knowledge of "how to check the status of mysql in operation". In the operation of actual cases, many people will encounter such a dilemma, so let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

One way to monitor a running mysql is to check the running status of the mysql.

(1) QPS (number of queries per second)

QPS = Questions (or Queries) / seconds

Mysql > show global status like 'Question%'

(2) TPS (transactions per second)

TPS = (Com_commit + Com_rollback) / seconds

Mysql > show global status like 'Com_commit'

Mysql > show global status like 'Com_rollback'

(3) key Buffer hit rate

Mysql > show global status like 'key%'

Key_buffer_read_hits = (1-key_reads / key_read_requests) * 100%

Key_buffer_write_hits = (1-key_writes / key_write_requests) * 100%

(4) InnoDB Buffer hit rate

Mysql > show status like 'innodb_buffer_pool_read%'

Innodb_buffer_read_hits = (1-innodb_buffer_pool_reads / innodb_buffer_pool_read_requests) * 100%

(5) Query Cache hit rate

Mysql > show status like 'Qcache%'

Query_cache_hits = (Qcahce_hits / (Qcache_hits + Qcache_inserts)) * 100%

(6) Table Cache state quantity

Mysql > show global status like 'open%'

Compare open_tables and opend_tables values

(7) Thread Cache hit rate

Mysql > show global status like 'Thread%'

Mysql > show global status like 'Connections'

Thread_cache_hits = (1-Threads_created / connections) * 100%

(8) locked statu

Mysql > show global status like'% lock%'

Table_locks_waited/Table_locks_immediate=0.3% if this ratio is relatively large, it means that the blocking caused by the table lock is more serious.

Innodb_row_lock_waits innodb row lock, too large may be caused by gap lock

(9) replication delay

Mysql > show slave status

View delay time

(10) Tmp Table status (temporary table status)

Mysql > show status like 'Create_tmp%'

The Created_tmp_disk_tables/Created_tmp_tables ratio had better not exceed 10%, if the Created_tmp_ tables value is relatively large

It may be that there are too many sorted sentences or the connected sentences are not optimized enough.

(11) Binlog Cache usage

Mysql > show status like 'Binlog_cache%'

If the Binlog_cache_disk_use value is not 0, you may need to increase the binlog_cache_size size

(12) Innodb_log_waits quantity

Mysql > show status like 'innodb_log_waits'

If the Innodb_log_waits value is not equal to 0, it indicates that innodb log buffer is waiting because of insufficient space.

Such as commands:

> # show global status

Although you can use:

> # show global status like%...%

To filter, but it is still necessary to figure out what each item means corresponding to the long list.

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