mysql优化思路

使用profiler来分析一条query的执行时间和性能瓶颈，
开启 profiling ；

set profiling=1;

随便执行一条语句 select count(*) from user where id>2;

show profiles;

得到

+----------+------------+--------------------------------------+
| Query_ID | Duration   | Query                                |
+----------+------------+--------------------------------------+
|        2 | 0.00009200 | set profiling=1                      |
|        5 | 0.02003525 | select count(*) from user where id>2 |
+----------+------------+--------------------------------------+

包含一个query_id和执行时间和query语句
通过query_id可以查看到更详细的信息；

show profile cpu ,block io  for query 5;

+----------------------+----------+----------+------------+--------------+---------------+
| Status               | Duration | CPU_user | CPU_system | Block_ops_in | Block_ops_out |
+----------------------+----------+----------+------------+--------------+---------------+
| starting             | 0.000170 | 0.000000 |   0.000000 |            0 |             0 |
| checking permissions | 0.000019 | 0.000000 |   0.000000 |            0 |             0 |
| Opening tables       | 0.000033 | 0.000000 |   0.000000 |            0 |             0 |
| init                 | 0.000061 | 0.000000 |   0.000000 |            0 |             0 |
| System lock          | 0.000021 | 0.000000 |   0.000000 |            0 |             0 |
| optimizing           | 0.000021 | 0.000000 |   0.000000 |            0 |             0 |
| statistics           | 0.010826 | 0.000000 |   0.000000 |          184 |             0 |
| preparing            | 0.000041 | 0.000000 |   0.000000 |            0 |             0 |
| executing            | 0.000005 | 0.000000 |   0.000000 |            0 |             0 |
| Sending data         | 0.008731 | 0.008000 |   0.000000 |            0 |             0 |
| end                  | 0.000020 | 0.000000 |   0.000000 |            0 |             0 |
| query end            | 0.000018 | 0.000000 |   0.000000 |            0 |             0 |
| closing tables       | 0.000012 | 0.000000 |   0.000000 |            0 |             0 |
| freeing items        | 0.000032 | 0.000000 |   0.000000 |            0 |             0 |
| cleaning up          | 0.000027 | 0.000000 |   0.000000 |            0 |             0 |
+----------------------+----------+----------+------------+--------------+---------------+

对mysql服务器的优化不要一上来就去优化sql语句，应该首先观察全局情况，至少要先搞清楚
问题出在哪，应该使用脚本来观察服务器一段时间（一天或更长）的健康状况，比如cpu，io，进程连接数等
最后才分析具体原因处在哪里；针对解决

mysql优化思路

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