Simon's SQL

SQL,DBA,tuning,Trouble Shooting,Performance

Posts Tagged ‘Backup chain broken’


Posted by Simon Cho on 01/04/2013

Veeam can truncate log base on some option.

It make backup chain broken.
When they perform truncate log, you can see 2 of the log like this.

SQL VSS is normal behavior to create SnapShot on disk.
But, Veeam Backup and replication with truncate log isn’t good option to manage database.

I recommend that do not enable truncate log on Veeam replication manager.

select top 10 * 
  from msdb.dbo.backupset
 where is_snapshot=1

--It's due to SQL VSS.
--Program_Name : "Microsoft SQL Server VSS Writer"

select top 10 * 
  from msdb.dbo.backupmediafamily
 where physical_device_name='NUL'

--It's due to Veeam.
--Program_Name : "Veeam Backup and Replication"

Posted in Common | Tagged: , , , | Leave a Comment »

Backup chain is broken due to Veeam Backup configuration improperly.

Posted by Simon Cho on 11/29/2012

Please select this one, “Do not truncate logs”.


Use the Truncation logs section to define the scenario of transaction log handing:

•Select Truncate logs on successful backup only if you want Veeam Backup & Replication to trigger truncation of logs only after the job is finished successfully. In this case, Veeam agent will wait for the replication to complete, and then will trigger truncation of transaction logs. If truncation of transaction logs is not possible for some reason, the logs will remain untouched in the VM guest OS till the next start of the Veeam agent.

•Select Truncate logs immediately if you want Veeam Backup & Replication to trigger truncation of logs in any case, no matter whether the job finishes successfully or fails.

•Select Do not truncate logs if you do not want Veeam Backup & Replication to truncate logs at all. This option is recommended if you are using another tool to perform guest-level replication and this tool maintains consistency of the database state. In such scenario, truncation of logs with Veeam Backup & Replication will break the guest-level replication chain and cause it to fall out of sync.


When I checked backup list, it’s truncate log like this.


So, physical_device_name is presented as ‘NUL’.

select bs.*
	 , bf.*
  from msdb.dbo.dbo.backupset bs
  join msdb.dbo.[backupmediafamily] bf
    on bs.media_set_id = bf.media_set_id
 where 1=1
   and database_name='MyDB' and type='L'
 order by backup_start_date desc

Posted in Common | Tagged: , , | Leave a Comment »