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Bulk-Logged Mode


Bulk-Logged Mode

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

Paul Randal
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SQL MVP, Microsoft RD, Contributing Editor of TechNet Magazine
Author of DBCC CHECKDB/repair (and other Storage Engine) code of SQL Server 2005
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Nice question Paul.



Jason AKA CirqueDeSQLeil
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UMG Developer
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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).
Christian Buettner-167247
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Professional question & answer.
Good start into the day.

Best Regards,

Chris Büttner
sharath.chalamgari
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Thanks Paul, i was thinking that the Log Backups will be smaller.
again i learned something new today!
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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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Those who understand binary, and those who don't."
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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?


Hugo Kornelis, SQL Server MVP
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Kari Suresh
Kari Suresh
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Good question.. Thanks

KSB
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Thousands of candles can be lit from a single candle, and the life of the candle will not be shortened. Knowledge and happiness never decreases by being shared.” - Buddha
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Good one.

Thanks.

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You can check my BLOG here


lbowman
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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.
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