sqlserver 性能调优脚本

-- 查看日志空间占用率
DBCC SQLPERF ( LOGSPACE)

SELECT TOP 10

        st.text AS SQL_Full                                        --父级完整语句

        ,SUBSTRING(st.text, (qs.statement_start_offset/2) + 1,

            ((CASE statement_end_offset 

            WHEN -1 THEN DATALENGTH(st.text)

            ELSE qs.statement_end_offset END 

            - qs.statement_start_offset)/2) + 1) as SQL_Part    --统计对应的部分语句

        , CAST( ((qs.total_elapsed_time / 1000000.0)/qs.execution_count) AS DECIMAL(28,2) ) AS [平均消耗秒数]

        , CAST(qs.last_elapsed_time / 1000000.0 AS DECIMAL(28, 2)) AS [最后完成消耗秒数]

        , qs.last_execution_time AS [最后执行时间]

        , CAST(qs.min_elapsed_time / 1000000.0 AS DECIMAL(28, 2)) AS [最小消耗秒数]

        , CAST(qs.max_elapsed_time / 1000000.0 AS DECIMAL(28, 2)) AS [最大消耗秒数]

        , CAST(qs.total_elapsed_time / 1000000.0 AS DECIMAL(28, 2)) AS [总消耗秒数]

        , (qs.execution_count) AS [总执行次数]

        , creation_time AS [编译计划的时间]

        , CAST(qs.last_worker_time / 1000000.0 AS DECIMAL(28, 2)) AS [最后完成占用CPU秒数]

        , qp.query_plan

    from sys.dm_exec_query_stats qs

        CROSS APPLY sys.dm_exec_sql_text(qs.sql_handle) AS st

        CROSS APPLY sys.dm_exec_query_plan(qs.plan_handle) qp

WHERE qs.last_execution_time>DATEADD(n,-30,GETDATE())

ORDER BY qs.last_worker_time DESC

--执行最慢的20条SQL语句
SELECT TOP 20 (total_elapsed_time / execution_count) / 1000 N‘平均时间ms‘,
       total_elapsed_time / 1000 N‘总花费时间ms‘,
       total_worker_time / 1000 N‘所用的CPU总时间ms‘,
       total_physical_reads N‘物理读取总次数‘,
       total_logical_reads / execution_count N‘每次逻辑读次数‘,
       total_logical_reads N‘逻辑读取总次数‘,
       total_logical_writes N‘逻辑写入总次数‘,
       execution_count N‘执行次数‘,
       SUBSTRING(
           st.text,
           (qs.statement_start_offset / 2) + 1,
           (
               (
                   CASE statement_end_offset
                        WHEN -1 THEN DATALENGTH(st.text)
                        ELSE qs.statement_end_offset
                   END
                   - qs.statement_start_offset
               ) / 2
           ) + 1
       ) N‘执行语句‘,
       creation_time N‘语句编译时间‘,
       last_execution_time         N‘上次执行时间‘
FROM   sys.dm_exec_query_stats  AS qs
       CROSS APPLY sys.dm_exec_sql_text(qs.sql_handle) st
WHERE  SUBSTRING(
           st.text,
           (qs.statement_start_offset / 2) + 1,
           (
               (
                   CASE statement_end_offset
                        WHEN -1 THEN DATALENGTH(st.text)
                        ELSE qs.statement_end_offset
                   END
                   - qs.statement_start_offset
               ) / 2
           ) + 1
       ) NOT LIKE ‘?tch%‘
ORDER BY
       total_elapsed_time / execution_count DESC;

--总耗CPU最多的前个SQL:
SELECT TOP 20
       total_worker_time / 1000           AS [总消耗CPU 时间(ms)],
       execution_count [运行次数],
       qs.total_worker_time / qs.execution_count / 1000 AS 
       [平均消耗CPU 时间(ms)],
       last_execution_time                AS [最后一次执行时间],
       max_worker_time / 1000             AS [最大执行时间(ms)],
       SUBSTRING(
           qt.text,
           qs.statement_start_offset / 2 + 1,
           (
               CASE 
                    WHEN qs.statement_end_offset = -1 THEN DATALENGTH(qt.text)
                    ELSE qs.statement_end_offset
               END -qs.statement_start_offset
           ) / 2 + 1
       )                                  AS [使用CPU的语法],
       qt.text [完整语法],
       qt.dbid,
       dbname = DB_NAME(qt.dbid),
       qt.objectid,
       OBJECT_NAME(qt.objectid, qt.dbid)     ObjectName
FROM   sys.dm_exec_query_stats qs WITH (NOLOCK)
                                       CROSS APPLY sys.dm_exec_sql_text(qs.sql_handle) AS 
       qt
WHERE  execution_count > 1
ORDER BY
       total_worker_time DESC

--平均耗CPU最多的前个SQL:
SELECT TOP 20
       total_worker_time / 1000           AS [总消耗CPU 时间(ms)],
       execution_count [运行次数],
       qs.total_worker_time / qs.execution_count / 1000 AS 
       [平均消耗CPU 时间(ms)],
       last_execution_time                AS [最后一次执行时间],
       min_worker_time / 1000             AS [最小执行时间(ms)],
       max_worker_time / 1000             AS [最大执行时间(ms)],
       SUBSTRING(
           qt.text,
           qs.statement_start_offset / 2 + 1,
           (
               CASE 
                    WHEN qs.statement_end_offset = -1 THEN DATALENGTH(qt.text)
                    ELSE qs.statement_end_offset
               END -qs.statement_start_offset
           ) / 2 + 1
       )                                  AS [使用CPU的语法],
       qt.text [完整语法],
       qt.dbid,
       dbname = DB_NAME(qt.dbid),
       qt.objectid,
       OBJECT_NAME(qt.objectid, qt.dbid)     ObjectName
FROM   sys.dm_exec_query_stats qs WITH (NOLOCK)
                                       CROSS APPLY sys.dm_exec_sql_text(qs.sql_handle) AS 
       qt
WHERE  execution_count > 1
ORDER BY
       (qs.total_worker_time / qs.execution_count / 1000) DESC