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Problem
Sometimes, the SQL Agent may be running a job that stops working and sits in a hung state. You want to implement a process to monitor for these types of jobs, alert if it exceeds a predetermined threshold, and optionally kill the job.
Solution
We’ll build a solution that uses a scheduled SQL Agent job that can check for other jobs that may be running for a long time. The msdb.dbo.sysjobactivity table can be used to watch running jobs and determine how long each has been running.
Find Running Jobs
Join the sysjobs and sysjobactivity tables in msdb to obtain the names of running jobs. A job is running if the start_execution_date has a value and the stop_execution_date is NULL.
-- mssqltips.com
SELECT [sj].[name]
FROM [msdb].[dbo].[sysjobs] [sj]
JOIN [msdb].[dbo].[sysjobactivity] [sja] ON [sj].[job_id] = [sja].[job_id]
WHERE [sja].[start_execution_date] IS NOT NULL
AND [sja].[last_executed_step_date] IS NULL
AND [sja].[stop_execution_date] IS NULL;
GO
There is a job called TestJob running on my system.
Find Jobs Running Longer Than a Specified Time
Add a variable of type INT, set it to the number of minutes to check for, and add another filter to the WHERE clause to compare start_execution_date with the current date and time. Here, we’ll check for jobs running longer than two hours by setting @RunLimit equal to 120.
---- mssqltips.com
-- begin config variables
DECLARE @RunLimit INT = 120 --run limit
-- end config variables
SELECT [sj].[name]
FROM [msdb].[dbo].[sysjobs] [sj]
JOIN [msdb].[dbo].[sysjobactivity] [sja] ON [sj].[job_id] = [sja].[job_id]
WHERE [sja].[start_execution_date] IS NOT NULL
AND [sja].[stop_execution_date] IS NULL
AND [sja].[start_execution_date] < DATEADD(MINUTE, -@RUNLIMIT, GETDATE());
GO
We can see that TestJob has been running longer than two hours.
Send Email for Hung Job
To be notified if a job is running longer than specified we can use sp_send_mail. Add variables: email from, email to, mail profile, job name, and email subject. This will watch for jobs running past the specified time and notify you via email. Also, this will return the job that has been running the longest.
/* mssqltips.com */
-- begin config variables
DECLARE @RunLimit INT = 120 -- run limit in minutes
DECLARE @Recipients VARCHAR(MAX) = 'DbaGroup@MyCompany.com ' -- to
DECLARE @FromAddress VARCHAR(MAX) = 'dbaalerts@mycompany.com' -- from
DECLARE @ProfileName VARCHAR(MAX) = 'default' -- database mail profile to use
-- end config variables
DECLARE @HungJob VARCHAR(MAX)
SET @HungJob =
(
SELECT TOP 1 [sj].[name]
FROM [msdb].[dbo].[sysjobs] [sj]
JOIN [msdb].[dbo].[sysjobactivity] [sja] ON [sj].[job_id] = [sja].[job_id]
WHERE [sja].[start_execution_date] IS NOT NULL
AND [sja].[last_executed_step_date] IS NULL
AND [sja].[stop_execution_date] IS NULL
AND [sja].[start_execution_date] < DATEADD(MINUTE, -@RunLimit, GETDATE())
ORDER BY [sja].[start_execution_date]
)
IF @HungJob IS NOT NULL
BEGIN
DECLARE @SUBJECTKILL VARCHAR(MAX) = 'SQL Agent Job ' + @HungJob + ' has been running longer than '
+ CAST(@RunLimit AS VARCHAR) + ' minutes and has been killed.'
EXEC [msdb].[dbo].[sp_send_dbmail] @profile_name = @ProfileName,
@recipients = @Recipients,
@subject = @SubjectKill,
@from_address = @FromAddress
END;
GO
We’re notified the job has run past the specified threshold.
Automatically Kill Hung Job and Send Email
To monitor for hung jobs, automatically kill them, and send an email notification, we add a variable to turn the kill job option on or off and an IF/ELSE to check the variable and run the appropriate SQL.
-- mssqltips.com
-- begin config variables
DECLARE @RUNLIMIT INT = 120 -- kill job if it's run more than this number of minutes
DECLARE @KILLJOB TINYINT = 1 -- 1 = kill hung job automatically
DECLARE @RECIPIENTS VARCHAR(MAX) = 'DbaGroup@MyCompany.com ' -- to
DECLARE @FROMADDRESS VARCHAR(MAX) = 'DbaAlerts@MyCompany.com' -- from
DECLARE @PROFILENAME VARCHAR(MAX) = 'default' -- database mail profile to use
-- end config variables
DECLARE @HUNGJOB VARCHAR(MAX)
SET @HUNGJOB = (SELECT TOP 1 [sj].[name]
FROM [msdb].[dbo].[sysjobs] [sj]
JOIN [msdb].[dbo].[sysjobactivity] [sja] ON [sj].[job_id] = [sja].[job_id]
WHERE [sja].[start_execution_date] IS NOT NULL
AND [sja].[last_executed_step_date] IS NULL
AND [sja].[stop_execution_date] IS NULL
AND [sja].[start_execution_date] < DATEADD(MINUTE, -@RunLimit, GETDATE())
ORDER BY [sja].[start_execution_date]
)
IF @HUNGJOB IS NOT NULL AND @KILLJOB = 1
BEGIN
EXEC [msdb].[dbo].[sp_stop_job] @job_name = @HUNGJOB
DECLARE @SUBJECTKILL VARCHAR(MAX) = 'SQL Agent Job ' + @HUNGJOB + ' has been running longer than '
+ CAST(@RUNLIMIT AS VARCHAR) + ' minutes and has been killed.'
EXEC [msdb].[dbo].[sp_send_dbmail] @profile_name = @PROFILENAME,
@recipients = @RECIPIENTS,
@subject = @SUBJECTKILL,
@from_address = @FROMADDRESS
END
ELSE IF @HUNGJOB IS NOT NULL AND @KILLJOB != 1
BEGIN
DECLARE @SUBJECTNOKILL VARCHAR(MAX) = 'SQL Agent Job ' + @HUNGJOB + ' has been running longer than '
+ CAST(@RUNLIMIT AS VARCHAR) + ' minutes.'
EXEC [msdb].[dbo].[sp_send_dbmail] @profile_name = @PROFILENAME,
@recipients = @RECIPIENTS,
@subject = @SUBJECTNOKILL,
@from_address = @FROMADDRESS
END;
GO
We’re notified the job has run past the specified threshold and was killed.
Create and Schedule SQL Agent Job to Monitor for Hung Processes
Lastly, create a SQL Agent job to automatically monitor for and optionally kill hung processes by configuring these variables and the schedule in the following script to automate the process:
- @RUNLIMIT
- @KILLJOB
- @RECIPIENTS
- @FROMADDRESS
- @PROFILENAME
USE [msdb]
GO
/****** Object: Job [HungSqlAgentJobMonitor] Script Date: 10/24/2023 8:24:22 AM ******/
BEGIN TRANSACTION
DECLARE @ReturnCode INT
SELECT @ReturnCode = 0
/****** Object: JobCategory [[Uncategorized (Local)]] Script Date: 10/24/2023 8:24:22 AM ******/
IF NOT EXISTS (SELECT name FROM msdb.dbo.syscategories WHERE name=N'[Uncategorized (Local)]' AND category_class=1)
BEGIN
EXEC @ReturnCode = msdb.dbo.sp_add_category @class=N'JOB', @type=N'LOCAL', @name=N'[Uncategorized (Local)]'
IF (@@ERROR <> 0 OR @ReturnCode <> 0) GOTO QuitWithRollback
END
DECLARE @jobId BINARY(16)
EXEC @ReturnCode = msdb.dbo.sp_add_job @job_name=N'HungSqlAgentJobMonitor',
@enabled=1,
@notify_level_eventlog=0,
@notify_level_email=0,
@notify_level_netsend=0,
@notify_level_page=0,
@delete_level=0,
@description=N'No description available.',
@category_name=N'[Uncategorized (Local)]',
@owner_login_name=N'sa', @job_id = @jobId OUTPUT
IF (@@ERROR <> 0 OR @ReturnCode <> 0) GOTO QuitWithRollback
/****** Object: Step [CheckForHungJobs] Script Date: 10/24/2023 8:24:22 AM ******/
EXEC @ReturnCode = msdb.dbo.sp_add_jobstep @job_id=@jobId, @step_name=N'CheckForHungJobs',
@step_id=1,
@cmdexec_success_code=0,
@on_success_action=1,
@on_success_step_id=0,
@on_fail_action=2,
@on_fail_step_id=0,
@retry_attempts=0,
@retry_interval=0,
@os_run_priority=0, @subsystem=N'TSQL',
@command=N'/* mssqltips.com */
-- begin config variables
DECLARE @RunLimit INT = 240 -- run limit in minutes
DECLARE @KillJob TINYINT = 1 -- 1 = kill hung job automatically
--DECLARE @Recipients VARCHAR(MAX) = ''DbaGroup@MyCompany.com '' -- to
DECLARE @Recipients VARCHAR(MAX) = ''jgavin@agrimark.net'' -- to
DECLARE @FromAddress VARCHAR(MAX) = ''dbaalerts@mycompany.com'' -- from
DECLARE @ProfilEName VARCHAR(MAX) = ''default'' -- database mail profile to use
-- end config variables
DECLARE @HungJob VARCHAR(MAX)
SET @HungJob =
(
SELECT TOP 1 [sj].[name]
FROM [msdb].[dbo].[sysjobs] [sj]
JOIN [msdb].[dbo].[sysjobactivity] [sja] ON [sj].[job_id] = [sja].[job_id]
WHERE [sja].[start_execution_date] IS NOT NULL
AND [sja].[last_executed_step_date] IS NULL
AND [sja].[stop_execution_date] IS NULL
AND [sja].[start_execution_date] < DATEADD(MINUTE, -@RunLimit, GETDATE())
ORDER BY [sja].[start_execution_date]
)
IF @HungJob IS NOT NULL AND @KillJob = 1
BEGIN
EXEC [msdb].[dbo].[sp_stop_job] @job_name = @HungJob
DECLARE @SUBJECTKILL VARCHAR(MAX)
= ''SQL Agent Job '' + @HungJob + '' has been running longer than '' + CAST(@RunLimit AS VARCHAR)
+ '' minutes and has been killed.''
EXEC [msdb].[dbo].[sp_send_dbmail] @profile_name = @ProfileName,
@recipients = @Recipients,
@subject = @SubjectKill,
@from_address = @FromAddress
END
ELSE IF @HungJob IS NOT NULL AND @KillJob != 1
BEGIN
DECLARE @SubjectNoKill VARCHAR(MAX)
= ''SQL Agent Job '' + @HungJob + '' has been running longer than '' + CAST(@RunLimit AS VARCHAR)
+ '' minutes.''
EXEC [msdb].[dbo].[sp_send_dbmail] @profile_name = @ProfileName,
@recipients = @Recipients,
@subject = @SubjectNoKill,
@from_address = @FromAddress
END;
GO
',
@database_name=N'msdb',
@flags=0
IF (@@ERROR <> 0 OR @ReturnCode <> 0) GOTO QuitWithRollback
EXEC @ReturnCode = msdb.dbo.sp_update_job @job_id = @jobId, @start_step_id = 1
IF (@@ERROR <> 0 OR @ReturnCode <> 0) GOTO QuitWithRollback
EXEC @ReturnCode = msdb.dbo.sp_add_jobschedule @job_id=@jobId, @name=N'HungSqlAgentJobMonitor',
@enabled=1,
@freq_type=4,
@freq_interval=1,
@freq_subday_type=8,
@freq_subday_interval=2,
@freq_relative_interval=0,
@freq_recurrence_factor=0,
@active_start_date=20231019,
@active_end_date=99991231,
@active_start_time=0,
@active_end_time=235959,
@schedule_uid=N'bf3a8a7a-fc57-4a43-970d-a7cb39a5a0d0'
IF (@@ERROR <> 0 OR @ReturnCode <> 0) GOTO QuitWithRollback
EXEC @ReturnCode = msdb.dbo.sp_add_jobserver @job_id = @jobId, @server_name = N'(local)'
IF (@@ERROR <> 0 OR @ReturnCode <> 0) GOTO QuitWithRollback
COMMIT TRANSACTION
GOTO EndSave
QuitWithRollback:
IF (@@TRANCOUNT > 0) ROLLBACK TRANSACTION
EndSave:
GO
Next Steps
Here are a few of the many SQL Server Agent Tips you’ll find on MSSQLTips.com:
- Working with SQL Server Agent in SQL Server Management Studio
- Getting Started with SQL Server Agent – Part 1
- SQL Server Agent Error Logging for PowerShell Job Steps
- Customized SQL Agent Job Notifications
- SQL Server Agent Job Ownership
- Running a SSIS Package from SQL Server Agent Using a Proxy Account
- How to Start SQL Server Agent When Agent XPs Show Disabled
- SQL Server Agent Job Management
- How to Change the SQL Server Agent Log File Path
- Managing SQL Server Agent Job History Log and SQL Server Error Log
