troubleshooting Question

Issue with XP_CMDShell Purge Old Backups script.

Avatar of Zack
ZackFlag for Australia asked on
Microsoft SQL ServerActive DirectoryShell ScriptingWindows Server 2016
7 Comments1 Solution123 ViewsLast Modified:
Hi EE,

I have the following script running in SQL server 2016:

-- Beware of server level collation and the way date formats are treated.
-- If date format needs to be forced use SET DATEFORMAT DMY

DECLARE @mydate nvarchar(50)
DECLARE @DeleteDateTime datetime
DECLARE @bakpath nvarchar(255)
DECLARE @BackupLocation nvarchar(255)
DECLARE @cmd nvarchar(4000)

EXEC master..xp_instance_regread N'HKEY_LOCAL_MACHINE', N'Software\Microsoft\MSSQLServer\MSSQLServer', N'BackupDirectory',@bakpath output
-- SET @bakpath = '<DRIVE>:\<PATH>'

-- Edit the number to subtract the number of hours required for 
-- the retention period i.e. -24 to delete files > 1 day
-- SET @DeleteDateTime = DateAdd(hh, -24, GetDate())

SET @DeleteDateTime = DateAdd(hh, -24, GetDate())
SET @mydate = (Select Replace(Convert(nvarchar, @DeleteDateTime, 111), '/', '-') + 'T' + Convert(nvarchar, @DeleteDateTime, 108))

-- Consider retention period if there is a need to split into separate jobs
-- copy and remove the type of backup files to suit target environment.

-- xp_delete_file will remove from 1 level of subdirectory only

-- Full backups
SET @BackupLocation = @bakpath
--SET @bakpath = @bakpath + '\FULL'-- customise path if required
set @cmd = 'EXECUTE master.dbo.xp_delete_file 0,N''' + @BackupLocation +''' ,N''bak'',N''' + @mydate + ''',1'
exec sp_executesql @cmd

The script isn't working, I have checked the registry the backup location is set correctly how would I go about debugging this, I suspect it's a path issue?

Additionally, I enabled the xp_cmdshell advanced config option on the SQL Server and that the SQL agent account has complete permissions to the backup directory folder so permissions should be ok.

Here is the SQLCMD used command to backup; sqlcmd -E -S $(ESCAPE_SQUOTE(SRVR)) -d master -Q "EXECUTE [dbo].[DatabaseBackup] @Databases = 'USER_DATABASES', @Directory = N'B:\MSSQL13.SQL2016\MSSQL\Backup', @BackupType = 'FULL', @Verify = 'Y', @CleanupTime = 48, @Compress = 'Y', @ChangeBackupType = 'Y', @CheckSum = 'Y'" -b

For some reason, the command doesn't insert the .bak files into the root directory but creates separate folders for each of the databases.

Any assistance would be appreciated.

Thank you.
David Todd
Senior Database Administrator

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