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Log backup Fails


Log backup Fails

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mahesh.dasoni
mahesh.dasoni
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I have full backup scheduled daily at evening 5 PM.
Differential occurs daily after every 3 hours throughout the day.
Log backups are scheduled after every 15 minutes.

But the scheduled after 2 am till 3 am for log backup starts failing stating the following error:

"BACKUP LOG cannot be performed because there is no current database backup.
BACKUP LOG is terminating abnormally.". Possible failure reasons: Problems with the query, "ResultSet" property not set correctly, parameters not set correctly, or connection not established correctly.
mahesh.dasoni
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I got it there is job which runs at 1:45 which truncates the log and so the log backup starts failing and it resumes once differential is completed at 3:00 am after 3 am log backup are successfull.
prettsons
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This error occurs when someone has run a process that has broken the log chain. Probably ran the command BACKUP LOG [Jul_Reports] WITH TRUNCATE_ONLY, or the database was switched to SIMPLE recovery and then back to FULL.

Once the log chain is broken, you cannot perform transaction log backups until the log chain has been re-established. To do that, you need to perform either a full or diff backup on that database.

If you don't need the database in full recovery, switch to simple and stop performing transaction log backups.

SQL Database Recovery Expert :-)
GilaMonster
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mahesh.dasoni (10/30/2012)
I got it there is job which runs at 1:45 which truncates the log and so the log backup starts failing and it resumes once differential is completed at 3:00 am after 3 am log backup are successfull.


Don't manually truncate your log. You're breaking your log chain and reducing the options you have for restoring that DB in the case of a disaster.

Please read through this - Managing Transaction Logs

Gail Shaw
Microsoft Certified Master: SQL Server, MVP, M.Sc (Comp Sci)
SQL In The Wild: Discussions on DB performance with occasional diversions into recoverability

We walk in the dark places no others will enter
We stand on the bridge and no one may pass


sanket kokane
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you have scheduled transactional log backup then why there is job for truncate log file Blink

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संकेत कोकणे
Bhuvnesh
Bhuvnesh
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sanket kokane (10/31/2012)
you have scheduled transactional log backup then why there is job for truncate log file Blink
+1

-------Bhuvnesh----------
I work only to learn Sql Server...though my company pays me for getting their stuff done;-)
Hemant.R
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hi mahesh,

This error occurs when someone has run a process that has broken the log chain. Probably ran the command BACKUP LOG [Jul_Reports] WITH TRUNCATE_ONLY, or the database was switched to SIMPLE recovery and then back to FULL.

if someone using backup log with truncate_only command in their job
please set below trace flag

3031
3231

it wont break lsn chain of database.
you will get explaination for traceflag on google.
Bhuvnesh
Bhuvnesh
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Hemant.R (12/12/2012)
hi mahesh,

This error occurs when someone has run a process that has broken the log chain. Probably ran the command BACKUP LOG [Jul_Reports] WITH TRUNCATE_ONLY, or the database was switched to SIMPLE recovery and then back to FULL.

if someone using backup log with truncate_only command in their job
please set below trace flag

3031
3231

it wont break lsn chain of database.
you will get explaination for traceflag on google.


A month old post Hehe

-------Bhuvnesh----------
I work only to learn Sql Server...though my company pays me for getting their stuff done;-)
Go


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