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Bulk-Logged Mode Expand / Collapse
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Posted Monday, June 7, 2010 10:22 PM


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Comments posted to this topic are about the item Bulk-Logged Mode

Paul Randal
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Author of DBCC CHECKDB/repair (and other Storage Engine) code of SQL Server 2005
Post #933779
Posted Monday, June 7, 2010 10:23 PM


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Nice question Paul.



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Post #933780
Posted Monday, June 7, 2010 10:45 PM
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Great question, thanks Paul!

I'm really surprised at the number of people that think the log backups would be smaller. The logs files themselves yes, which is really the only reason I can see using the bulk-logged recovery model. It seems you either need complete disaster recovery (FULL) or you don't (SIMPLE).
Post #933784
Posted Tuesday, June 8, 2010 12:55 AM
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Professional question & answer.
Good start into the day.


Best Regards,
Chris Büttner
Post #933816
Posted Tuesday, June 8, 2010 12:55 AM


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Thanks Paul, i was thinking that the Log Backups will be smaller.
again i learned something new today!
Post #933817
Posted Tuesday, June 8, 2010 1:43 AM
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Hello Paul

Perfect Question!!!

To be specific I like the Answers provided are superb.

Anyway I pass it

Cheers



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Post #933831
Posted Tuesday, June 8, 2010 1:50 AM


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Good question, Paul!

In your explanation, you write that log backups are about the same size as when full recovery had been uses. This matches my expectation, but in Books Online, it says:
"The tradeoffs are bigger log backups and (...)"
ms-help://MS.SQLCC.v9/MS.SQLSVR.v9.en/udb9/html/8cfea566-8f89-4581-b30d-c53f1f2c79eb.htm

Is this a documentation bug?



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Post #933834
Posted Tuesday, June 8, 2010 3:22 AM


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Good question.. Thanks

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Post #933860
Posted Tuesday, June 8, 2010 3:53 AM


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Good one.

Thanks.


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Post #933871
Posted Tuesday, June 8, 2010 7:03 AM
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Based on the explanation, the use of the term "a lot smaller" must be the reasoning for excluding answer "D". Even though http://msdn.microsoft.com/en-us/library/aa173529(SQL.80).aspx states.
The Bulk-Logged Recovery model provides protection against media failure combined with the best performance and minimal log space usage for certain large-scale or bulk copy operations.

Though, as pointed out, the data extents are logged, insufficent detail is logged to allow point in time recovery which would indicate that "significant" data is not written for BULK_LOGGED operations and therefore smaller log backups.
Post #933970
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