MySql性能优化(排查慢查询SQL)
时间:2021-07-01 10:21:17
帮助过:3人阅读
total_worker_time /
1000 AS [自编译以来执行所用的CPU时间总量(ms)],
total_elapsed_time/
1000 as [完成执行此计划所用的总时间],
total_elapsed_time / execution_count/
1000 as [平均完成执行此计划所用时间],
execution_count as [上次编译以来所执行的次数],
creation_time as [编译计划的时间],
deqs.total_worker_time / deqs.execution_count /
1000 AS [平均使用CPU时间(ms)],
last_execution_time AS [上次开始执行计划的时间],
total_physical_reads [编译后在执行期间所执行的物理读取总次数],
total_logical_reads/
execution_count [平均逻辑读次数],
min_worker_time /
1000 AS [单次执行期间所用的最小CPU时间(ms)],
max_worker_time /
1000 AS [单次执行期间所用的最大 CPU 时间(ms)],
SUBSTRING(dest.text, deqs.statement_start_offset /
2 +
1,
(CASE
WHEN deqs.statement_end_offset = -
1 THEN
DATALENGTH(dest.text)
ELSE deqs.statement_end_offset
END -
deqs.statement_start_offset
) /
2 +
1) AS [执行SQL],
dest.text as [完整SQL],
db_name(dest.dbid) as [数据库名称],
object_name(dest.objectid, dest.dbid) as [对象名称]
,deqs.plan_handle [查询所属的已编译计划]
FROM sys.dm_exec_query_stats deqs WITH(NOLOCK)
CROSS APPLY sys.dm_exec_sql_text(deqs.sql_handle) AS dest
--
平均使用CPU时间降序
ORDER BY (deqs.total_worker_time / deqs.execution_count /
1000) DESC
--
执行时间降序
--ORDER BY total_elapsed_time / execution_count DESC;
平均使用CPU时间降序
执行时间降序
查看执行计划
select * from sys.dm_exec_query_plan(0x05000A0045E84551103903112400000001000000000000000000000000000000000000000000000000000000)
二、查看
MySql性能优化(排查慢查询SQL)
标签:statement sql优化 ros name esc vpd log ast des