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Weekly full backup of multiple SQL databases fails to backup a single database

Posted on 2013-10-29
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Last Modified: 2016-02-11
Hello Experts

We have a single SQL server with a single instance of SQL on it. This server has > 50 databases on it. Each Tuesday morning we run a backup maintenance task that takes a full backup of each database and every other day of the week another job runs which takes a differential backup.

The problem I have is that the full backup job backs up all the databases on the server with one exception - the xyz database. This database is good and in use. Every Tuesday morning we get an error similar to, or the same as, this:

Date: '29/10/2013'
Time: '01:14:34'
Event: '3041'
Type: 'ERROR'
Category: 'Backup'
User: 'NT AUTHORITY\SYSTEM'
Source: 'MSSQL$WEB_SC'
Computer: 'servername'
Message: 'BACKUP failed to complete the command BACKUP DATABASE xyz . Check the backup application log for detailed messages.'
Data: 'server \ W E B _ S C xyz'

The backup application log has nothing in it at all and the only other error that we get is this:

Date: '29/10/2013'
Time: '01:14:28'
Event: '17063'
Type: 'ERROR'
Category: 'Server'
User: 'NT AUTHORITY\SYSTEM'
Source: 'MSSQL$WEB_SC'
Computer: 'servername'
Message: 'Error: 50000 Severity: 16 State: 1 Full backup failed for database: '
Data: 'server \ W E B _ S C m a s t e r '

The differential backups run fine. If I run a manual full backup of this database it works OK.

We are running SQL Server 2008 R2 with SP1. All help most appreciated.
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Question by:citicus
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Expert Comment

by:lcohan
ID: 39609199
" If I run a manual full backup of this database it works OK."

How is the backup running other than manual? My guess is - Scheduled Maintenance Plan right? and if it's like that what account/login is that one starting at? Can you check SQL Server Agent Service and see if that account has sufficient rights?

What account/login are you using when " If I run a manual full backup of this database it works OK."?
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Author Comment

by:citicus
ID: 39609258
Your guess is correct re the scheduled maintenance plan.

When I run the manual backup I am logged in as myself - a local/domain/SQL admin.

The job runs as NTAUTHORITY\SYSTEM - would you mind telling me how I can check if the SQL Server Agent Service has the rights it needs? I think it will have as the database that is failing to be backed up is a copy of one that is being backed up OK.
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lcohan earned 500 total points
ID: 39609291
"I think it will have as the database that is failing to be backed up is a copy of one that is being backed up OK. "

In my opinion that assumption is not 100% always true.

Aside of that
"When I run the manual backup I am logged in as myself - a local/domain/SQL admin."
I presume the
"...database that is failing to be backed up is a copy of one that is being backed up OK"

so that backup was already completed - maybe one file is already open because the backup is going against it and needs to finish before the other one starts - in this case will confirm that the authority is not an issue and remember Maintenance Plans as SSIS as well and by default I believe Microsoft set it to run 4 tasks in parallel. In your case this means you need to serialize your backups/check backups if authority/rights is not an issue.
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