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SQL Log Truncation and Log Backup Silently Fails After Installing Veeam 9.5 Update 3
Challenge
After installing Veeam 9.5 Update 3, SQL logs are not truncated during backup, but the truncation task is still marked as a success in the job statistics. SQL Log Backup sessions complete with 0 KB transferred.
You can confirm if any SQL VMs are affected by this change by checking the Guest Helper log located on the Guest VM.
GuestHelper log location: \\GuestVM\c$\ProgramData\Veeam\Backup\VeeamGuestHelper_%date%.log
The specific error you will find in the GuestHelper log if affected is the following:
Description = The UPDATE permission was denied on the object 'backupset', database 'msdb', schema 'dbo'.
You can confirm if any SQL VMs are affected by this change by checking the Guest Helper log located on the Guest VM.
GuestHelper log location: \\GuestVM\c$\ProgramData\Veeam\Backup\VeeamGuestHelper_%date%.log
The specific error you will find in the GuestHelper log if affected is the following:
Description = The UPDATE permission was denied on the object 'backupset', database 'msdb', schema 'dbo'.
Cause
This is due to a change in required SQL Permissions in 9.5 Update 3. These permissions requirements were changed to resolve a previous issue with how Veeam sends requests to SQL to finalize database backup and log truncation. The specific change in permissions is that the msdb system database now requires db_datawriter role, whereas before this was not needed.
Required SQL Permissions for SQL log backup and truncation can be found here:
https://helpcenter.veeam.com/docs/backup/explorers/vesql_permissions.html?ver=95
Required SQL Permissions for SQL log backup and truncation can be found here:
https://helpcenter.veeam.com/docs/backup/explorers/vesql_permissions.html?ver=95
Solution
To resolve this issue, please give the following SQL permissions to the account credentials specified to use for Guest Processing:
- Sysadmin role, or the following can be used if you need to provide only minimal permissions:
- SQL Server instance-level roles: dbcreator and public
- Database-level roles: db_backupoperator, db_denydatareader, public
- For System Databases:
- master - db_backupoperator, db_datareader, public;
- msdb - db_backupoperator, db_datawriter, db_datareader, public
- Securables: view any definition, view server state
- For truncation of SQL Server 2012 or SQL Server 2014 database transaction logs, this account should have the db_backupoperator database role (minimal required) or the sysadmin server role.
KB ID:
2447
Product:
Veeam Backup & Replication
Version:
9.x
Published:
2018-02-23
Last Modified:
2020-08-13
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