Run the status command to view the Slow queries item. If the value is greater than 0 for a long time, the query execution time is too long.
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Reference content is as follows:
Mysql> status;
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Mysql Ver 11.18 Distrib 3.23.58, for redhat-linux-gnu (i386)
Connection id: 53
Current database: (null)
Current user: root @ localhost
Current pager: stdout
Using outfile :''
Server version: 5.0.37-log
Protocol version: 10
Connection: Localhost via UNIX socket
Client characterset: latin1
Server characterset: latin1
UNIX socket:/tmp/mysql. sock
Uptime: 4 days 16 hours 49 min 57 sec
Threads: 1 Questions: 706 Slow queries: 0 Opens: 177 Flush tables: 1 Open tables:
52 Queries per second avg: 0.002
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Then, run the show processlist command to view the currently running SQL statements, find slow SQL statements, find slow statements, and then run the explain command to view the execution plans of these statements.
Mysql> show processlist;
+ ---- + ------ + ----------- + ------ + --------- + ------ + ------- + ------------------ +
| Id | User | Host | db | Command | Time | State | Info |
+ ---- + ------ + ----------- + ------ + --------- + ------ + ------- + ------------------ +
| 53 | root | localhost | NULL | Query | 0 | NULL | show processlist |
+ ---- + ------ + ----------- + ------ + --------- + ------ + ------- + ------------------ +