The ERASE command
Published 23 March 2017
Use the ERASE command with the SQL Backup Pro -SQL parameter to delete backup files based on their age, or the number of files you want to keep using the command line or extended stored procedure. The ERASE command works in a similar way to the ERASEFILES parameter used with the BACKUP and RESTORE commands, but enables you to delete backup files independently of a backup or restore operation.
You must also specify the database name, backup type, and a PASSWORD parameter if the files are encrypted.
Only files in the directory specified in the FROM DISK parameter are considered for deletion. Subdirectories are not checked.
Syntax
ERASE { FULL_BACKUPS | DIFF_BACKUPS | LOG_BACKUPS }
FOR { database_name }
FROM {DISK} = { 'physical_device_name' } [,...n]
KEEP = { days | hours{h} | latest{b}}
[ WITH
[ [ , ] ] PASSWORD = { 'password' | 'FILE:file_path'} ]
]
Arguments
KEEP
You can choose to delete SQL Backup files based on:
- Age: files older than the specified number of days or hours are deleted. Type a number for days, or type h after the number for hours. For example,
KEEP = 24deletes files that are more than 24 days old;KEEP = 24hdeletes files that are more than 24 hours old. Note that a 'day' is calculated as a period of 24 hours, and takes no account of calendar date. - Number of backups to keep: only the latest 'x' backups will be kept. To specify the number of backups to be kept, type b after the number. For example,
KEEP = 5bensures the latest 5 backups are kept; older backups are deleted.
PASSWORD
Specifies the password to be used with encrypted backup files. (Specifying a password does not prevent unencrypted files from being deleted.)
If the ERASE command applies to more than one backup file, and these have different passwords, then only those backup files for which the supplied password is correct will be deleted.
Storing your password in a plain text file
If you don't want the password to be stored in your SQL Agent jobs, you can use a password stored in a plain text file instead. This means access to the password can be restricted using Windows file permissions.
To do this, specify the file path and name after the PASSWORD keyword instead of the password itself.
Example
PASSWORD = 'FILE:C:\mypasswords\password.txt'
SQL Backup will read only the first line of text in the file (up to the first line return), and ignore everything after.
Example
This example keeps the 7 most recent full backups of the pubs database in the folder C:\Backups; older full backups of the pubs database are deleted from the folder:
SQLBackupC.exe -SQL "ERASE FULL_BACKUPS FOR [pubs] FROM DISK = 'C:\Backups' KEEP = 7b WITH PASSWORD = 'MyPassword'"
EXECUTE master..sqlbackup '-SQL "ERASE FULL_BACKUPS FOR [pubs] FROM DISK = ''C:\Backups'' KEEP = 7b WITH PASSWORD = ''MyPassword''"'
