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Mysql two useful SQL performance analysis statements

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1> explain SQL, similar to the explain statement in Oracle

For example: explain select * from nad_aditem;

2> select benchmark (count, sql); Calculate sql statement to perform count times the time spent

E.g:

mysql> select benchmark (1000; Select * FROM AD;);

+ -------------- +

| benchmark (1000; Select * FROM AD;) |

+ -------------- +

| 0 |

+ -------------- +

1 row in set (0.02 sec)

Observe 0.02 this time, and can not just focus on this time, but also observe the CPU and system load.

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