SQL捕捉blocking信息

场景：

客户抱怨数据库慢，但是回去看的时候，可能已经不慢了，为了查出当时到底是什么原因导致数据慢，制作了下面的存储过程，然后每隔3分钟运行一遍，把blocking信息插入一个数据库中。

主要就是查询sys.processes这个dmv，然后根据sql handle获取sql text， 把信息分别保存到2张表中。 目前来看，工作比较顺利，找到了数据库中不少造成阻塞的信息，也给开发那边一个交代。

 USE [MonitorBlocking]
 GO
 /****** Object:  StoredProcedure [dbo].[checkBlocking]    Script Date: 8/16/2017 3:01:35 PM ******/
 SET ANSI_NULLS ON
 GO
 SET QUOTED_IDENTIFIER ON
 GO
 ALTER PROCEDURE [dbo].[checkBlocking]
 AS
 BEGIN
 SET NOCOUNT ON;
 ---返回有多少行受影响
 SET TRANSACTION ISOLATION LEVEL READ UNCOMMITTED
 ---设置隔离级别，避免产生锁
 declare @Duration   int -- in milliseconds, 1000 = 1 sec
 declare @now        datetime
 declare @Processes  int
 select  @Duration = 100  -- in milliseconds, 1000 = 1 sec
 select  @Processes = 0
 select @now = getdate()
 ---创建临时表
 CREATE TABLE #Blocks_rg(
       [spid] smallint,
       [kpid] smallint,
       [blocked] smallint,
       [waitType] binary(2),
       [waitTime] bigInt,
       [lastWaitType] nchar(32),
       [waitResource] nchar(256),
       [dbID] smallint,
       [uid] smallint,
       [cpu] int,
       [physical_IO] int,
       [memusage] int,
       [login_Time] datetime,
       [last_Batch] datetime,
       [open_Tran] smallint,
       [status] nchar(30),
       [sid] binary(86),
       [hostName] nchar(128),
       [program_Name] nchar(128),
       [hostProcess] nchar(10),
       [cmd] nchar(16),
       [nt_Domain] nchar(128),
       [nt_UserName] nchar(128),
       [net_Library] nchar(12),
       [loginName] nchar(128),
       [context_Info] binary(128),
       [sqlHandle] binary(20),
       [CapturedTimeStamp] datetime
 )     

 将阻塞信息插入临时表
 INSERT INTO #Blocks_rg
 SELECT
       [spid],
       [kpid],
       [blocked],
       [waitType],
       [waitTime],
       [lastWaitType],
       [waitResource],
       [dbID],
       [uid],
       [cpu],
       [physical_IO],
       [memusage],
       [login_Time],
       [last_Batch],
       [open_Tran],
       [status],
       [sid],
       [hostName],
       [program_name],
       [hostProcess],
       [cmd],
       [nt_Domain],
       [nt_UserName],
       [net_Library],
       [loginame],
       [context_Info],
       [sql_Handle],
       @now as [Capture_Timestamp]
 FROM master..sysprocesses where blocked <> 0
 AND waitTime > @Duration
 ----等待时间大于1s的会被捕捉

 SET @Processes = @@rowcount
 ---返回多少行，赋值给Processer

 ---加入捕捉时间
 INSERT into #Blocks_rg
 SELECT 

       src.[spid],
       src.[kpid],
       src.[blocked],
       src.[waitType],
       src.[waitTime],
       src.[lastWaitType],
       src.[waitResource],
       src.[dbID],
       src.[uid],
       src.[cpu],
       src.[physical_IO],
       src.[memusage],
       src.[login_Time],
       src.[last_Batch],
       src.[open_Tran],
       src.[status],
       src.[sid],
       src.[hostName],
       src.[program_name],
       src.[hostProcess],
       src.[cmd],
       src.[nt_Domain],
       src.[nt_UserName],
       src.[net_Library],
       src.[loginame],
       src.[context_Info],
       src.[sql_Handle]
       ,@now as [Capture_Timestamp]
 FROM  master..sysprocesses src inner join #Blocks_rg trgt
        on trgt.blocked = src.[spid]

 if @Processes > 0
 ---根据sql handle 依次查出SQL Text， 然后插入[Blocking_SqlText]表
 BEGIN
       INSERT [dbo].[Blocking_sysprocesses]
       SELECT * from #Blocks_rg

 DECLARE @SQL_Handle binary(20), @SPID smallInt;
 DECLARE cur_handle CURSOR FOR SELECT sqlHandle, spid FROM #Blocks_rg;
 OPEN cur_Handle
 FETCH NEXT FROM cur_handle INTO @SQL_Handle, @SPID
 WHILE (@@FETCH_STATUS = 0)
 BEGIN

 INSERT [dbo].[Blocking_SqlText]
 SELECT      @SPID, CONVERT(nvarchar(4000), [text]) ,@now as [Capture_Timestamp] from ::fn_get_sql(@SQL_Handle)

 FETCH NEXT FROM cur_handle INTO @SQL_Handle, @SPID
 END
 CLOSE cur_Handle
 DEALLOCATE cur_Handle

 END

 DROP table #Blocks_rg

 END