SQL server 2008 数据库优化比较常用脚本

发布时间：2023-07-28 15:08:12 所属栏目：MsSql教程来源：

导读：--查询某个数据库的连接数

select count(*) from Master.dbo.SysProcesses where dbid=db_id()

--前10名其他等待类型

SELECT TOP 10 * from sys.dm_os_wait_stats

ORDER BY wait_time_ms DESC

S

--查询某个数据库的连接数

select count(*) from Master.dbo.SysProcesses where dbid=db_id()

--前10名其他等待类型

SELECT TOP 10 * from sys.dm_os_wait_stats

ORDER BY wait_time_ms DESC

SELECT *FROM sys.dm_os_wait_stats WHERE wait_type like 'PAGELATCH%'

OR wait_type like 'LAZYWRITER_SLEEP%'

--cpu的压力

SELECT scheduler_id,current_tasks_count,runnable_tasks_count

FROM sys.dm_os_schedulers

WHERE scheduler_id < 255

--表现最差的前10名使用查询

SELECT TOP 10 ProcedureName = t.text,

ExecutionCount = s.execution_count,

AvgExecutionTime = isnull ( s.total_elapsed_time / s.execution_count,0 ),

AvgWorkerTime = s.total_worker_time / s.execution_count,

TotalWorkerTime = s.total_worker_time,

MaxLogicalReads = s.max_logical_reads,

MaxPhysicalReads = s.max_physical_reads,

MaxLogicalWrites = s.max_logical_writes,

CreationDateTime = s.creation_time,

CallsPerSecond = isnull ( s.execution_count / datediff ( second,s.creation_time,getdate ()),0 )

FROM sys.dm_exec_query_stats s

CROSS APPLY sys.dm_exec_sql_text( s.sql_handle ) t ORDER BY

s.max_physical_reads DESC

SELECT SUM(signal_wait_time_ms) AS total_signal_wait_time_ms总信号等待时间,

SUM(wait_time_ms - signal_wait_time_ms) AS resource_wait_time_ms资源的等待时间,

SUM(signal_wait_time_ms) * 1.0 / SUM (wait_time_ms) * 100 AS [signal_wait_percent信号等待％],

SUM(wait_time_ms - signal_wait_time_ms) * 1.0 / SUM (wait_time_ms) * 100 AS [resource_wait_percent资源等待％]

FROM sys.dm_os_wait_stats

--一个信号等待时间过多对资源的等待时间那么你的cpu是目前的一个瓶颈。

--查看进程所执行的sql语句

if (select COUNT(*) from master.dbo.sysprocesses) > 500

begin

select text,CROSS APPLY master.sys.dm_exec_sql_text(a.sql_handle) from master.sys.sysprocesses a

end

select text,a.* from master.sys.sysprocesses a

CROSS APPLY master.sys.dm_exec_sql_text(a.sql_handle)

where a.spid = '51'

dbcc inputbuffer(53)

with tb

as

(

select blocking_session_id,

session_id,db_name(database_id) as dbname,text from master.sys.dm_exec_requests a

CROSS APPLY master.sys.dm_exec_sql_text(a.sql_handle)

),

tb1 as

(

select a.,login_time,program_name,client_interface_name,login_name,cpu_time,memory_usage8 as 'memory_usage(KB)',

total_scheduled_time,reads,writes,logical_reads

from tb a inner join master.sys.dm_exec_sessions b

on a.session_id=b.session_id

)

select a.*,connect_time,client_tcp_port,client_net_address from tb1 a inner join master.sys.dm_exec_connections b on a.session_id=b.session_id

--当前进程数

select * from master.dbo.sysprocesses

order by cpu desc

--查看当前活动的进程数

sp_who active

--查询是否由于连接没有释放引起cpu过高

select * from master.dbo.sysprocesses

where spid> 50

and waittype = 0x0000

and waittime = 0

and status = 'sleeping '

and last_batch < dateadd(minute,-10,getdate())

and login_time < dateadd(minute,getdate())

--强行释放空连接

select 'kill ' + rtrim(spid) from master.dbo.sysprocesses

where spid> 50

and waittype = 0x0000

and waittime = 0

and status = 'sleeping '

and last_batch < dateadd(minute,-60,getdate())

--查看当前占用 cpu 资源最高的会话和其中执行的语句(及时cpu)

select spid,cmd,cpu,physical_io,memusage,

(select top 1 [text] from ::fn_get_sql(sql_handle)) sql_text

from master..sysprocesses order by cpu desc,physical_io desc

--查看缓存中重用次数少，占用内存大的查询语句（当前缓存中未释放的）--全局

SELECT TOP 100 usecounts,objtype,p.size_in_bytes,[sql].[text]

FROM sys.dm_exec_cached_plans p OUTER APPLY sys.dm_exec_sql_text (p.plan_handle) sql

ORDER BY usecounts,p.size_in_bytes desc

SELECT top 25 qt.text,qs.plan_generation_num,qs.execution_count,dbid,objectid

FROM sys.dm_exec_query_stats qs

CROSS APPLY sys.dm_exec_sql_text(sql_handle) as qt

WHERE plan_generation_num >1

ORDER BY qs.plan_generation_num

SELECT top 50 qt.text AS sql_text,SUM(qs.total_worker_time) AS total_cpu_time,

SUM(qs.execution_count) AS total_execution_count,

SUM(qs.total_worker_time)/SUM(qs.execution_count) AS avg_cpu_time,

COUNT(*) AS number_of_statements

FROM sys.dm_exec_query_stats qs

CROSS APPLY sys.dm_exec_sql_text(qs.sql_handle) as qt

GROUP BY qt.text

ORDER BY total_cpu_time DESC --统计总的cpu时间

--ORDER BY avg_cpu_time DESC --统计平均单次查询cpu时间

-- 计算可运行状态下的工作进程数量

SELECT COUNT(*) as workers_waiting_for_cpu,s.scheduler_id

FROM sys.dm_os_workers AS o

INNER JOIN sys.dm_os_schedulers AS s

ON o.scheduler_address=s.scheduler_address

AND s.scheduler_id<255

WHERE o.state='RUNNABLE'

GROUP BY s.scheduler_id

--表空间大小查询

create table #tb(表名 sysname,记录数 int,保留空间 varchar(100),使用空间 varchar(100),索引使用空间 varchar(100),未用空间 varchar(100))

insert into #tb exec sp_MSForEachTable 'EXEC sp_spaceused ''?'''

select * from #tb

go

SELECT

表名,

记录数,

cast(ltrim(rtrim(replace(保留空间,'KB',''))) as int)/1024 保留空间MB,

cast(ltrim(rtrim(replace(使用空间,''))) as int)/1024 使用空间MB,''))) as int)/1024/1024.00 使用空间GB,

cast(ltrim(rtrim(replace(索引使用空间,''))) as int)/1024 索引使用空间MB,

cast(ltrim(rtrim(replace(未用空间,''))) as int)/1024 未用空间MB

FROM #tb

WHERE cast(ltrim(rtrim(replace(使用空间,''))) as int)/1024 > 0

--order by 记录数 desc

ORDER BY 使用空间MB DESC

DROP TABLE #tb

--查询是否由于连接没有释放引起cpu过高

select * from master.dbo.sysprocesses

where spid> 50

and waittype = 0x0000

and waittime = 0

and status = 'sleeping '

and last_batch < dateadd(minute,getdate())

----查看当前占用 cpu 资源最高的会话和其中执行的语句(及时cpu)

select spid,physical_io desc

----查看缓存中重用次数少，占用内存大的查询语句（当前缓存中未释放的）--全局

SELECT TOP 100 usecounts,s.scheduler_id

FROM sys.dm_os_workers AS o

INNER JOIN sys.dm_os_schedulers AS s

ON o.scheduler_address=s.scheduler_address

AND s.scheduler_id<255

WHERE o.state='RUNNABLE'

GROUP BY s.scheduler_id

SELECT creation_time N'语句编译时间'

,last_execution_time N'上次执行时间'

,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'

,total_worker_time/1000 N'所用的cpu总时间ms'

,total_elapsed_time/1000 N'总花费时间ms'

,(total_elapsed_time / execution_count)/1000 N'平均时间ms'

,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'

FROM sys.dm_exec_query_stats AS qs

CROSS APPLY sys.dm_exec_sql_text(qs.sql_handle) st

where SUBSTRING(st.text,

((CASE statement_end_offset

WHEN -1 THEN DATALENGTH(st.text)

ELSE qs.statement_end_offset END

- qs.statement_start_offset)/2) + 1) not like '%fetch%'

ORDER BY total_elapsed_time / execution_count DESC

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