How to purge MSDB history using T-SQL scripts


One of the Maintenance Plan Tasks available is the History Cleanup Task which can help you keep the MSDB database size in check. This Maintenance Plan Task uses the MSDB Stored Procedures sp_delete_backuphistory and sp_purge_jobhistory to cleanup the historical information inside the MSDB system tables.   

I have seen multiple scenarios where trying to delete all the historical data has proved to be fatal (because the log file grows disproportionately when the autogrow setting is set to percentage growth and due to large number of logged operations) . In such scenarios, you are left with two choices:   

1. Use the Maintenance Plan GUI to modify the oldest date for the History Cleanup Task for shorter durations and perform the cleanup by executing the job for shorter intervals.   

OR   

2. Use the script below to perform what the Cleanup Task would do.   

The script below would give a the list of commands to be executed. If you are concerned about the size of your MSDB transaction log file during the course of this purge operation, use the Checkpoint (if MSDB is in SIMPLE recovery which is the Default. Can’t think of a reason why someone would want it to be full.) piece which is currently commented in the below batch to keep the transaction log in size. Checkpoint operation under Simple Recovery model truncates the transaction log file.   

The script can be downloaded from TechNet also in case you face any formatting issues with the script above. Download Link: http://gallery.technet.microsoft.com/ScriptCenter/en-us/b3e2e276-b14a-406d-b67a-d8cbd9e1eabe   

SCRIPT   


-- Declare Local Variables

declare @mindate datetime, @oldest_date datetime, @sql varchar(8000), @currdate datetime, @oldestdate datetime -- Find out the oldest date from the Backup Set table

select @mindate = min(backup_start_date) from msdb..backupset

set @currdate = @mindate + 7

set @oldestdate = '2009-11-04 00:00:00.000' -- Modify this to the date till which you want your msdb history purged while

-- Begin a while loop to generate the commands to purge the MSDB entries

while (@currdate <= @oldestdate)

begin

set @sql = 'EXEC msdb..sp_delete_backuphistory ''' + cast(@currdate as varchar(20)) + ''''

print @sql

set @sql = 'EXEC msdb..sp_purge_jobhistory @oldest_date = ''' + cast(@currdate as varchar(20)) + ''''

print @sql

print char(13)

-- Optional if you are running out of space in MSDB

--print 'use msdb' + char(13) + 'checkpoint'

-- Increment value and move on to the next date

set @currdate = @currdate + 7 -- The time interval can be modified to suit your needs end

end

-- End of while loop

set @sql = 'EXEC msdb..sp_delete_backuphistory ''' + cast(@oldestdate as varchar(20)) + ''''

print @sql

set @sql = 'EXEC msdb..sp_purge_jobhistory @oldest_date = ''' + cast(@oldestdate as varchar(20)) + ''''

print @sql

 

 

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