sqlserver2008数据库优化常用脚本

时间:2021-10-14 07:14:39
--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_usage*8 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, -10, 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()) 
 and login_time < 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,'KB',''))) as int)/1024 使用空间MB,
cast(ltrim(rtrim(replace(使用空间,'KB',''))) as int)/1024/1024.00 使用空间GB,
cast(ltrim(rtrim(replace(索引使用空间,'KB',''))) as int)/1024 索引使用空间MB,
cast(ltrim(rtrim(replace(未用空间,'KB',''))) as int)/1024 未用空间MB 
FROM #tb 
WHERE cast(ltrim(rtrim(replace(使用空间,'KB',''))) 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, -10, getdate()) 
 and login_time < dateadd(minute, -10, 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()) 
 and login_time < 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






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, (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 '%fetch%'

 ORDER BY  total_elapsed_time / execution_count DESC