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Discuss content posted by Suja James
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Full backup Scenario
66 posts, Page 7 of 7
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Full backup Scenario
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Peter Trast
Peter Trast
Posted Wednesday, March 31, 2010 8:38 AM
Mr or Mrs. 500
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Paul White NZ (3/31/2010)
Thank you, Peter. Of course, there are some edge cases and subtleties, but unless Mr Randal appears and tells me I know nothing about nothing...I'm happy with it.
I don't sweat the exceptions. Concepts first, exceptions later. Can't understand the exceptions until the normal process makes sense. I get grief for using broken analogies to explain concepts like joins but the students like simple explanations, even if they are flawed by real world applications.
Peter Trast
Microsoft Certified ...(insert many literal strings here)
Microsoft Design Architect with Alexander Open Systems
Post #893833
L' Eomot Inversé
L' Eomot Inversé
Posted Wednesday, March 31, 2010 2:58 PM
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Paul White NZ (3/31/2010)
The whole backup operation is conceptually quite simple:
Force a database checkpoint (flush all updated-in-memory pages to disk before anything is read by the backup)
Record the minimum recovery LSN (LSN1)
Database data read begins
Database data read ends
Record the current LSN (LSN2)
Read the transaction log from LSN1 to LSN2
Thanks Paul, that's a very clear description. It answers all the questions I had about whether dirty data is flushed first, when the start LSN is recorded, and whether the final LSN is allowed to be later than the current LSN at the end of the DB read.
And I see the MS design does include flushing already dirty pages to disc despite Hugo's suggestion that this is not a useful thing to do.
Tom
Que conclure à la fin de tous mes longs propos? C'est que les préjugés sont la raison des sots. (Voltaire, 1756)
Post #894230
Hugo Kornelis
Hugo Kornelis
Posted Wednesday, March 31, 2010 4:08 PM
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Tom.Thomson (3/31/2010)
And I see the MS design does include flushing already dirty pages to disc despite Hugo's suggestion that this is not a useful thing to do.
Yes, I noticed that as well. And was a bit surprised by it.
I'm glad Paul was able to find and post such a detailed description of the process. Thanks, Paul!
Hugo Kornelis, SQL Server MVP
Visit my SQL Server blog:
http://sqlblog.com/blogs/hugo_kornelis
Post #894272
Paul White
Paul White
Posted Thursday, April 01, 2010 3:33 AM
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Thanks, everyone. Glad I am not the only one to find this whole area fascinating.
Paul White
SQL Server MVP
SQLblog.com
@SQL_Kiwi
Post #894538
Festeron
Festeron
Posted Thursday, April 01, 2010 9:47 AM
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Paul White NZ (4/1/2010)
Thanks, everyone. Glad I am not the only one to find this whole area fascinating.
Yes, I do too [for reasons unfathomable]
And I'm glad I kinda kicked off the discussion about when the backup knew when to stop. I'm slogging my way through all of Paul's postings, and drawing diagrams of my own.
Again, thanks to all.
Post #894957
Teenu
Teenu
Posted Thursday, June 10, 2010 3:46 AM
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Good question! Tests ones' understanding in a better ways.
Kudos to the Question submitter!
Post #935246
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