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Does BACKUP use the transaction log?


Does BACKUP use the transaction log?

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jhager
jhager
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Hi,

I noticed several autogrowth events for the transaction log file of a database shortly after its backup job started. I've browsed around MSDN but can't find any mention of whether the transaction log is used for the backup operation.

Not a high-priority issue, just interested to know about it.

Thanks,

Jeff
GilaMonster
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The backup doesn't write to the transaction log, but while there's a backup in progress space in the log can't be reused. If you're seeing autogrow events, it suggests that maybe you need to grow the log a bit larger than what it is, leave space for cases like this.

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

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jhager
jhager
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Thanks for replying and the info. I'll increase the log file as you've suggested.

~ Jeff
Orlando Colamatteo
Orlando Colamatteo
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jhager, if you're interested, here is an article that explains why the transaction log is involved in full backups and how much of it is required:

http://www.sqlskills.com/blogs/paul/debunking-a-couple-of-myths-around-full-database-backups/

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jhager
jhager
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Thanks, I'm always interested to learn more about the product and its inner workings.

~ Jeff
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