By: Eli Leiba | Updated: 2018-08-29 | Comments (1) | Backup
The requirement is to delete old SQL Server backup files that may still exist on disk. This will be done by reading the backup history data from the msdb SQL Server database so we don't need to search multiple directories, but use the history data to determine where the backups were created.
My solution involves creating a stored procedure in the SQL Server master database called dbo.usp_DeleteOldBackupFiles.
The procedure takes two parameters:
- @DaysOld: An integer number used to calculate the date used to decide from when to delete the backup files. All backup files created before (current Date - @DaysOld) are selected for deletion.
- @mode: The procedure's action modes are 'R' – for reporting files names and 'D' for reporting and deleting the files.
The procedure joins the msdb.dbo.backupmediafamily and msdb.dbo.backupset tables and lists only the files where the backup starting date is earlier than (current Date - @DaysOld).
The procedure loops over all the found files and checks if the file actually exists by executing master.dbo.xp_fileexist. If the file exists, the procedure checks the @mode parameter: if @mode=R it only reports the file and if the @mode=D it also deletes the file by using the Ole Automation Procedure sp_OAMethod in a 'DeleteFile' mode.
The 'Ole Automation Procedures' should be set in order to successfully delete the old backup files by using this procedure. Use the following script to set this option (sysadmin role required). The script ensures that the 'Ole Automation procedures' option is enabled by using the sp_configure system stored procedure.
USE master GO -- enable show advanced options exec sp_configure 'show advanced options', 1 go RECONFIGURE GO -- enable Ole Automation Procedures exec sp_configure 'Ole Automation Procedures', 1 GO RECONFIGURE GO
SQL Server Stored Procedure to Delete Old Backup Files
Create the stored procedure in the master database.
USE master GO -- ================================================================================= -- Author: Eli Leiba -- Create date: 2018-09 -- Procedure Name: dbo.usp_DeleteOldBackupFiles -- Description: -- The procedure looks over the backup history table in the MSDB database: -- And searches for backup files older than @DaysOld days before -- The current procedure Execution date. -- If the @mode parameter = R, it only reports the file names and -- If the @mode parameter = D it reports and deletes the files. -- ================================================================================== CREATE PROCEDURE dbo.usp_DeleteOldBackupFiles (@DaysOld INT, @mode CHAR (1)) AS BEGIN DECLARE @dbName SYSNAME DECLARE @SD DATETIME DECLARE @FD DATETIME DECLARE @filename VARCHAR (255) DECLARE @msg VARCHAR (300) DECLARE @fileExists INT DECLARE @Filehandle INT SET NOCOUNT ON DECLARE c_fileList CURSOR FOR SELECT b.database_name, b.backup_start_date, b.backup_finish_date, a.physical_device_name FROM msdb.dbo.backupmediafamily a, msdb.dbo.backupset b WHERE a.media_set_id = b.media_set_id AND (CONVERT (DATETIME, b.backup_start_date, 102) < GETDATE () - @DaysOld) ORDER BY b.database_name, b.backup_finish_date; -- create a file system object EXEC sp_OACreate 'Scripting.FileSystemObject', @Filehandle OUTPUT -- open working cursor and loop over all rows. OPEN c_fileList; FETCH NEXT FROM c_fileList INTO @dbName, @SD, @FD, @filename WHILE @@FETCH_STATUS = 0 BEGIN EXEC Master.dbo.xp_fileexist @filename, @fileExists OUT IF @fileExists = 1 BEGIN SET @msg = CONCAT ( 'Delete backup file: ' @filename, 'For Database: ' @dbName, 'Started on: ' Convert (VARCHAR (12), @sd, 103), 'Finished on: ' Convert (VARCHAR (12), @fd, 103) ) IF (UPPER (@mode) IN ('R','D')) BEGIN PRINT @msg END -- If mode = D then delete the file IF (UPPER (@mode) = 'D') BEGIN EXEC sp_OAMethod @Filehandle, 'DeleteFile', NULL, @filename END END FETCH NEXT FROM c_fileList INTO @dbName, @sd, @fd, @filename END CLOSE c_fileList; DEALLOCATE c_fileList; -- Memory cleanup EXEC sp_OADestroy @Filehandle SET NOCOUNT OFF END GO
Report all backup files 700 or more days older than the present day.
USE master GO EXEC dbo.usp_DeleteOldBackupFiles @DaysOld=700, @mode = 'R' GO
And the results are (on my server):
Delete backup files 700 or more days older than the present day.
USE master GO EXEC dbo.usp_DeleteOldBackupFiles @DaysOld=700, @mode = 'D' GO
The result is same report as the report above and the files are deleted as well.
- You can create and compile this simple procedure in your master database and use it as a simple tool for deleting old backup files.
- Remember that the 'Ole Automation Procedures' should be set.
- The procedure was tested with SQL Server 2014 Standard Edition, but should work for all editions for SQL Server 2005 and later.
- Check out the SQL Server Backup Tips.
- Check out the SQL Server Backup Tutorial.
Last Updated: 2018-08-29
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