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Circular logging with exchange 2010

Posted on 2014-02-19
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Hers is my question.. If I have circular logging enabled on the data bases during a migration, will this affect how far back I can go on a backup to do a restore?
I know with it enabled I cant do incremental backups but was not sure say if I need to do a restore from say 2 weeks ago, if my backups will be affected at all with the circular logging enabled?
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Question by:vmich
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Nick Rhode earned 250 total points
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Depends on the backup mainly.  With circular logging if you did a backup it flushes the logs out after a successful backup.  So if you backed up yesterday and the server went down today you would most likely lose the email you had today because you cannot truncate the logs for they have been overwritten with circular logging.  So in general with circular logging you most likely will lose the mail after the last successful backup.  Some mail is recovered just not all of it.
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by:Jamie McKillop
Jamie McKillop earned 250 total points
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Hello,

If circular logging was not enabled when the backup was taken, you can restore the full backup and then restore any log files you have backed up between that backup and the next full backup. This would allow you to effectively restore the database to any point in time you want. If circular logging was enabled when the backup was taken, you can only restore that full backup, so you are limited to restoring the database to the exact time of any particular full backup you have.

-JJ
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by:vmich
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so I should then get the backup job running and have it flush the logs during the migration instead of having circular logging enabled?
Is this correct?"
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Best Practices: Disaster Recovery Testing

Besides backup, any IT division should have a disaster recovery plan. You will find a few tips below relating to the development of such a plan and to what issues one should pay special attention in the course of backup planning.

 
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by:Jamie McKillop
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If the time to complete your migration is fairly short (couple of days), I would stick with circular logging. Any more than that are you are taking a risk.

-JJ
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by:vmich
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ok thanks
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Best Practices: Disaster Recovery Testing

Besides backup, any IT division should have a disaster recovery plan. You will find a few tips below relating to the development of such a plan and to what issues one should pay special attention in the course of backup planning.

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