Prevent the VERIFYONLY workload from affecting users. This is why in our weekly maintenance routines we verify large backupsĭuring maintenance times or on a separate server somewhere in an effort to Too much CPU load but doing a VERIFYONLY does. Backup W Compression Only (98GB database)īACKUP DATABASE TO DISK = N'R:MSSQLBackupsLargeSQLRXdb_Full.bak'Īs you can see, it looks like doing CHECKSUMs does not add Backup W Compression and Checksum (98GB database)īACKUP DATABASE TO DISK = N'R:MSSQLBackupsLargeSQLRXdb_Full_Cksum.bak' RESTORE VERIFYONLY FROM DISK = N'R:MSSQLBackupsLargeSQLRXdb_Full_Cksum_Vfy.bak' WITH FILE = NOUNLOAD, NOREWIND Backup information for database ''LargeSQLRXdb'' not found.', 16, 1) end If is null begin raiserror(N'Verify failed. Select = position from msdb.backupset where database_name=N'LargeSQLRXdb' and backup_set_id=(select max(backup_set_id)įrom msdb.backupset where database_name=N'LargeSQLRXdb' ) WITH NOFORMAT, INIT, NAME = N'LargeSQLRXdb-Full Database Backup', Backup W Compression, Checksum and Verify (98GB database)īACKUP DATABASE TO DISK = N'R:MSSQLBackupsLargeSQLRXdb_Full_Cksum_Vfy.bak' ![]() Backup W Compression Only (2GB database)īACKUP DATABASE TO DISK = N'R:MSSQLBackupsSQLRX_Full.bak' Backup W Compression and Checksum (2GB database)īACKUP DATABASE TO DISK = N'R:MSSQLBackupsSQLRX_Full_Cksum.bak' RESTORE VERIFYONLY FROM DISK = N'R:MSSQLBackupsSQLRX_Full_Cksum_Vfy.bak' WITH FILE = NOUNLOAD, NOREWIND Backup information for database ''SQLRX'' not found.', 16, 1) end Select = position from msdb.backupset where database_name=N'SQLRX' and backup_set_id=(select max(backup_set_id)įrom msdb.backupset where database_name=N'SQLRX' ) WITH NOFORMAT, INIT, NAME = N'SQLRX-Full Database Backup', Here is the TSQL for the backups: - Backup W Compression, Checksum and Verify (2GB database)īACKUP DATABASE TO DISK = N'R:MSSQLBackupsSQLRX_Full_Cksum_Vfy.bak' ![]() Isn’t best practice nice!?!? Results are as follows: Backups Used a SQL 2016 instance with 4 CPU’s and 24GB of memory for both backups andīackups and restores to disks that are separate from the actual databaseįiles. I also performed all tests using a small (2GB) To do the backups with 3 different tests.ġ) Backup with the COMPRESSION, CHECKSUM and VERIFYONLY options, 2)īackup with COMPRESSION and CHECKSUM options and 3) Backup with COMPRESSIONĬHECKSUM can take more CPU so I wanted to see what would happen. I thought I would do a small test to see how long it takes So these are two different things and both contribute towards you knowing that you have a good backup file and that the file can be reliably restored. Set is complete and the entire backup is readable. Verifies the backup but does not restore it, and checks to see that the backup Here is what Microsoft says about both reliability options:ĬHECKSUM specifies that the backup operation verifies each page for checksum and torn page, if enabled and available, and generate a checksum for the entire backup. In that case, you will have to include CHECKSUM using TSQL. ![]() ** Note: I am using the most recent version of SSMS. In the backup GUI the verify backup and CHECKSUM options are in the Reliability options: Understand what these backup and restore options are. So, let’s take a step back and make sure that we all I will generally space out the differentialĪnd tlog backups according to our client’s specific requirements for downtime I generally take full database backups everyĭay along with both differential and transaction log backups throughout the day. You should be performing regular database backups. However, I totally missed also havingĬHECKSUM specified when creating backup files. That will periodically test backups by restoring using VERIFYONLY. Regular database backups that I had no idea that I should have been using allīackup file and have incorporated into our standard maintenance routines one I found out that I have been missing something from our
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