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Featured Database Articles

MS SQL

Posted Oct 26, 2004

Monitor Blocking in SQL Server 2000 - Part II - Page 2

By Muthusamy Anantha Kumar aka The MAK



Step 5

Create a job Job_BlockMonitor by using Job_BlockMonitor.SQL, as shown in Fig 1.3 and Fig 1.4. This job will not create a schedule.







Source Code to create the job Job_blockmonitor

-- Script generated on 10/15/2004 1:41 PM
-- By: SQL\Administrator
-- Server: SQL

BEGIN TRANSACTION
  DECLARE @JobID BINARY(16)
  DECLARE @ReturnCode INT
  SELECT @ReturnCode = 0
IF (SELECT COUNT(*) FROM msdb.dbo.syscategories WHERE name = N'[Uncategorized (Local)]') < 1 
  EXECUTE msdb.dbo.sp_add_category @name = N'[Uncategorized (Local)]'

  -- Delete the job with the same name (if it exists)
  SELECT @JobID = job_id
  FROM   msdb.dbo.sysjobs
  WHERE (name = N'Job_BlockMonitor')       
  IF (@JobID IS NOT NULL)
  BEGIN
  -- Check if the job is a multi-server job
  IF (EXISTS (SELECT  *
              FROM    msdb.dbo.sysjobservers 
              WHERE   (job_id = @JobID) AND (server_id <> 0))) 
  BEGIN 
    -- There is, so abort the script 
    RAISERROR (N'Unable to import job ''Job_BlockMonitor'' since there is already 
	  a multi-server job with this name.', 16, 1) 
    GOTO QuitWithRollback  
  END 
  ELSE 
    -- Delete the [local] job 
    EXECUTE msdb.dbo.sp_delete_job @job_name = N'Job_BlockMonitor' 
    SELECT @JobID = NULL
  END 

BEGIN 

  -- Add the job
  EXECUTE @ReturnCode = msdb.dbo.sp_add_job @job_id = @JobID OUTPUT , 
    @job_name = N'Job_BlockMonitor', @owner_login_name = N'sa', 
	@description = N'No description available.', @category_name = N'[Uncategorized (Local)]', 
	@enabled = 1, @notify_level_email = 0, @notify_level_page = 0, @notify_level_netsend = 0, 
	@notify_level_eventlog = 2, @delete_level= 0
  IF (@@ERROR <> 0 OR @ReturnCode <> 0) GOTO QuitWithRollback 

  -- Add the job steps
  EXECUTE @ReturnCode = msdb.dbo.sp_add_jobstep @job_id = @JobID, @step_id = 1, 
    @step_name = N'JOb_BlockMonitor', @command = N'usp_blockmonitor 1,0,''d:\BLOCKING.LOG''
', @database_name = N'master', @server = N'', @database_user_name = N'', 
    @subsystem = N'TSQL', @cmdexec_success_code = 0, @flags = 0, @retry_attempts = 0, 
	@retry_interval = 1, @output_file_name = N'', @on_success_step_id = 0, 
	@on_success_action = 1, @on_fail_step_id = 0, @on_fail_action = 2
  IF (@@ERROR <> 0 OR @ReturnCode <> 0) GOTO QuitWithRollback 
  EXECUTE @ReturnCode = msdb.dbo.sp_update_job @job_id = @JobID, @start_step_id = 1 

  IF (@@ERROR <> 0 OR @ReturnCode <> 0) GOTO QuitWithRollback 

  -- Add the Target Servers
  EXECUTE @ReturnCode = msdb.dbo.sp_add_jobserver @job_id = @JobID, @server_name = N'(local)' 
  IF (@@ERROR <> 0 OR @ReturnCode <> 0) GOTO QuitWithRollback 

END
COMMIT TRANSACTION
GOTO   EndSave
QuitWithRollback:
  IF (@@TRANCOUNT > 0) ROLLBACK TRANSACTION 
EndSave: 

Download Job_BlockMonitor.SQL

Step 6

Create another job that runs the procedure usp_blockingalert every minute. (Refer to Fig 1.5, 1.6 and 1.7]


Fig 1.5


Fig 1.6


Fig 1.7

Source code for creating this job.

-- Script generated on 10/15/2004 1:51 PM
-- By: SQL\Administrator
-- Server: SQL

BEGIN TRANSACTION
  DECLARE @JobID BINARY(16)
  DECLARE @ReturnCode INT
  SELECT @ReturnCode = 0
IF (SELECT COUNT(*) FROM msdb.dbo.syscategories WHERE name = N'[Uncategorized (Local)]') < 1 
  EXECUTE msdb.dbo.sp_add_category @name = N'[Uncategorized (Local)]'

  -- Delete the job with the same name (if it exists)
  SELECT @JobID = job_id
  FROM   msdb.dbo.sysjobs
  WHERE (name = N'Job_BlockMonitorAlert')
  IF (@JobID IS NOT NULL)
  BEGIN
  -- Check if the job is a multi-server job
  IF (EXISTS (SELECT  *
              FROM    msdb.dbo.sysjobservers 
              WHERE   (job_id = @JobID) AND (server_id <> 0))) 
  BEGIN 
    -- There is, so abort the script 
    RAISERROR (N'Unable to import job ''Job_BlockMonitorAlert'' since there is 
	   already a multi-server job with this name.', 16, 1) 
    GOTO QuitWithRollback  
  END 
  ELSE 
    -- Delete the [local] job 
    EXECUTE msdb.dbo.sp_delete_job @job_name = N'Job_BlockMonitorAlert' 
    SELECT @JobID = NULL
  END 

BEGIN 

  -- Add the job
  EXECUTE @ReturnCode = msdb.dbo.sp_add_job @job_id = @JobID OUTPUT , 
    @job_name = N'Job_BlockMonitorAlert', @owner_login_name = N'sa', 
	@description = N'No description available.', @category_name = N'[Uncategorized (Local)]', 
	@enabled = 1, @notify_level_email = 0, @notify_level_page = 0, @notify_level_netsend = 0, 
	@notify_level_eventlog = 2, @delete_level= 0
  IF (@@ERROR <> 0 OR @ReturnCode <> 0) GOTO QuitWithRollback 

  -- Add the job steps
  EXECUTE @ReturnCode = msdb.dbo.sp_add_jobstep @job_id = @JobID, @step_id = 1, 
    @step_name = N'Job_BlockMonitorAlert', @command = N'exec usp_blockingalert 1, ''d:\Blocking.log''', 
	@database_name = N'master', @server = N'', @database_user_name = N'', @subsystem = N'TSQL', 
	@cmdexec_success_code = 0, @flags = 0, @retry_attempts = 0, @retry_interval = 1, 
	@output_file_name = N'', @on_success_step_id = 0, @on_success_action = 1, 
	@on_fail_step_id = 0, @on_fail_action = 2
  IF (@@ERROR <> 0 OR @ReturnCode <> 0) GOTO QuitWithRollback 
  EXECUTE @ReturnCode = msdb.dbo.sp_update_job @job_id = @JobID, @start_step_id = 1 

  IF (@@ERROR <> 0 OR @ReturnCode <> 0) GOTO QuitWithRollback 

  -- Add the job schedules
  EXECUTE @ReturnCode = msdb.dbo.sp_add_jobschedule @job_id = @JobID, 
    @name = N'Job_BlockMonitorAlert', @enabled = 1, @freq_type = 4, 
	@active_start_date = 20041015, @active_start_time = 0, @freq_interval = 1, 
	@freq_subday_type = 4, @freq_subday_interval = 1, @freq_relative_interval = 0, 
	@freq_recurrence_factor = 0, @active_end_date = 99991231, @active_end_time = 235959
  IF (@@ERROR <> 0 OR @ReturnCode <> 0) GOTO QuitWithRollback 

  -- Add the Target Servers
  EXECUTE @ReturnCode = msdb.dbo.sp_add_jobserver @job_id = @JobID, @server_name = N'(local)' 
  IF (@@ERROR <> 0 OR @ReturnCode <> 0) GOTO QuitWithRollback 

END
COMMIT TRANSACTION
GOTO   EndSave
QuitWithRollback:
  IF (@@TRANCOUNT > 0) ROLLBACK TRANSACTION 
EndSave: 

Download Job_BlockMonitorAlert.sql

Process

When blocking occurs, and if it is more than a minute, it will start the job "Job_BlockMonitor." "Jobs_MonitorBlock" will collect information instantly about blocking in the file "D:\Blocking.log" as shown in the Fig 1.8


Fig 1.8

Conclusion

Using this method, you can collect detailed information on blocking when a blocking duration exceeds one minute. If you would like to collect the information on blocking when the duration of blocking exceeds 2 or 3 minutes, then update the jobs schedule to run for every 2 minutes or three minutes.

» See All Articles by Columnist MAK



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