SQL server 2008 数据库优化常用脚本(sqlserver2008数据库定时备份)

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--查询某个数据库的连接数select count(*) from Master.dbo.SysProcesses where dbid=db_id()

--前名其他等待类型SELECT TOP * from sys.dm_os_wait_statsORDER 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_countFROM sys.dm_os_schedulersWHERE scheduler_id <

--表现最差的前名使用查询SELECT TOP 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 sCROSS APPLY sys.dm_exec_sql_text( s.sql_handle ) t ORDER BYs.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) * AS [signal_wait_percent信号等待％],SUM(wait_time_ms - signal_wait_time_ms) * 1.0 / SUM (wait_time_ms) * 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) > beginselect text,CROSS APPLY master.sys.dm_exec_sql_text(a.sql_handle) from master.sys.sysprocesses a

endselect text,a.* from master.sys.sysprocesses aCROSS APPLY master.sys.dm_exec_sql_text(a.sql_handle)where a.spid = ''dbcc inputbuffer()with tbas(select blocking_session_id,session_id,db_name(database_id) as dbname,text from master.sys.dm_exec_requests aCROSS 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_readsfrom tb a inner join master.sys.dm_exec_sessions bon 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.sysprocessesorder 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.sysprocesseswhere spid> and waittype = 0xand waittime = 0and status = 'sleeping 'and last_batch < dateadd(minute, -, getdate())and login_time < dateadd(minute, -, getdate())

--强行释放空连接select 'kill ' + rtrim(spid) from master.dbo.sysprocesseswhere spid> and waittype = 0xand waittime = 0and status = 'sleeping 'and last_batch < dateadd(minute, -, getdate())and login_time < 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,cmd,cpu,physical_io,memusage,(select top 1 [text] from ::fn_get_sql(sql_handle)) sql_textfrom 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 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) sqlORDER BY usecounts,p.size_in_bytes descSELECT top qt.text,qs.plan_generation_num,qs.execution_count,dbid,objectidFROM sys.dm_exec_query_stats qsCROSS APPLY sys.dm_exec_sql_text(sql_handle) as qtWHERE plan_generation_num >1ORDER BY qs.plan_generation_numSELECT top 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_statementsFROM sys.dm_exec_query_stats qsCROSS APPLY sys.dm_exec_sql_text(qs.sql_handle) as qtGROUP BY qt.textORDER 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_idFROM sys.dm_os_workers AS oINNER JOIN sys.dm_os_schedulers AS sON o.scheduler_address=s.scheduler_addressAND s.scheduler_id<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(),使用空间 varchar(),索引使用空间 varchar(),未用空间 varchar())insert into #tb exec sp_MSForEachTable 'EXEC sp_spaceused ''&#;'''select * from #tbgoSELECT表名,记录数,cast(ltrim(rtrim(replace(保留空间,'KB',''))) as int)/ 保留空间MB,cast(ltrim(rtrim(replace(使用空间,'KB',''))) as int)/ 使用空间MB,cast(ltrim(rtrim(replace(使用空间,'KB',''))) as int)//. 使用空间GB,cast(ltrim(rtrim(replace(索引使用空间,'KB',''))) as int)/ 索引使用空间MB,cast(ltrim(rtrim(replace(未用空间,'KB',''))) as int)/ 未用空间MBFROM #tbWHERE cast(ltrim(rtrim(replace(使用空间,'KB',''))) as int)/ > 0--order by 记录数 descORDER BY 使用空间MB DESCDROP TABLE #tb

--查询是否由于连接没有释放引起CPU过高select * from master.dbo.sysprocesseswhere spid> and waittype = 0xand waittime = 0and status = 'sleeping 'and last_batch < dateadd(minute, -, getdate())and login_time < dateadd(minute, -, getdate())

--强行释放空连接select 'kill ' + rtrim(spid) from master.dbo.sysprocesseswhere spid> and waittype = 0xand waittime = 0and status = 'sleeping 'and last_batch < dateadd(minute, -, getdate())and login_time < 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,cmd,cpu,physical_io,memusage,(select top 1 [text] from ::fn_get_sql(sql_handle)) sql_textfrom 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 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) sqlORDER BY usecounts,p.size_in_bytes descSELECT top qt.text,qs.plan_generation_num,qs.execution_count,dbid,objectidFROM sys.dm_exec_query_stats qsCROSS APPLY sys.dm_exec_sql_text(sql_handle) as qtWHERE plan_generation_num >1ORDER BY qs.plan_generation_numSELECT top 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_statementsFROM sys.dm_exec_query_stats qsCROSS APPLY sys.dm_exec_sql_text(qs.sql_handle) as qtGROUP BY qt.textORDER 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_idFROM sys.dm_os_workers AS oINNER JOIN sys.dm_os_schedulers AS sON o.scheduler_address=s.scheduler_addressAND s.scheduler_id<WHERE o.state='RUNNABLE'GROUP BY s.scheduler_idSELECT 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/ N'所用的CPU总时间ms', total_elapsed_time/ N'总花费时间ms', (total_elapsed_time / execution_count)/ N'平均时间ms',SUBSTRING(st.text, (qs.statement_start_offset/2) + 1,((CASE statement_end_offsetWHEN -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 qsCROSS APPLY sys.dm_exec_sql_text(qs.sql_handle) stwhere SUBSTRING(st.text, (qs.statement_start_offset/2) + 1,((CASE statement_end_offsetWHEN -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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