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Home » Article Discussions » Article Discussions by Author » Discuss content posted by Paul Randal » Bulk-Logged Mode
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Paul Randal
Posted Monday, June 07, 2010 10:22 PM


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

Paul Randal
CEO, SQLskills.com: Check out SQLskills online training!
Blog:www.SQLskills.com/blogs/paul Twitter: @PaulRandal
SQL MVP, Microsoft RD, Contributing Editor of TechNet Magazine
Author of DBCC CHECKDB/repair (and other Storage Engine) code of SQL Server 2005
Post #933779
SQLRNNR
Posted Monday, June 07, 2010 10:23 PM


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Nice question Paul.


Jason AKA CirqueDeSQLeil
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Post #933780
UMG Developer
Posted Monday, June 07, 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
Christian Buettner-167247
Posted Tuesday, June 08, 2010 12:55 AM
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Professional question & answer.
Good start into the day.

Best Regards,
Chris Büttner
Post #933816
sharath.chalamgari
Posted Tuesday, June 08, 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
free_mascot
Posted Tuesday, June 08, 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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Those who understand binary, and those who don't."
Post #933831
Hugo Kornelis
Posted Tuesday, June 08, 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?

Hugo Kornelis, SQL Server MVP
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Post #933834
Kari Suresh
Posted Tuesday, June 08, 2010 3:22 AM


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Good question.. Thanks

KSB
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Post #933860
Atif-ullah Sheikh
Posted Tuesday, June 08, 2010 3:53 AM


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Good one.

Thanks.

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Post #933871
lbowman
Posted Tuesday, June 08, 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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