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Full Backups
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Full Backups
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Kenneth.Fisher
Kenneth.Fisher
Posted Thursday, July 19, 2012 8:42 PM
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Comments posted to this topic are about the item
Full Backups
Kenneth Fisher
I strive to live in a world where a chicken can cross the road without being questioned about its motives.
--------------------------------------------------------------------------------
For better, quicker answers on T-SQL questions, click on the following...
http://www.sqlservercentral.com/articles/Best+Practices/61537/
For better answers on performance questions, click on the following...
http://www.sqlservercentral.com/articles/SQLServerCentral/66909/
Link to my Blog Post -->
www.SQLStudies.com
Post #1332665
WayneS
WayneS
Posted Thursday, July 19, 2012 9:51 PM
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The full backup will also contain the uncommitted transactions from transaction 4 at the time that the backup finishes. If a restore is necessary, the UNDO portion of the restore will roll back those transactions. Therefore, the full backup will contain transactions from all four of the transactions.
A small error in the question: transaction 1 never is committed, and transaction 2 is committed twice (which can't happen). Obviously, one of those transaction 2 commits is for transaction 1.
Edit: see
http://technet.microsoft.com/en-us/magazine/2009.02.logging.aspx
for more about the UNDO portion of recovery.
Wayne
Microsoft Certified Master: SQL Server 2008
If you can't explain to another person how the code that you're copying from the internet works, then
DON'T USE IT
on a production system! After all,
you
will be the one supporting it!
Links:
For better assistance in answering your questions
,
How to ask a question
,
Performance Problems
,
Common date/time routines
,
CROSS-TABS and PIVOT tables Part 1
&
Part 2
,
Using APPLY Part 1
&
Part 2
,
Splitting Delimited Strings
Post #1332676
Lokesh Vij
Lokesh Vij
Posted Thursday, July 19, 2012 9:54 PM
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+1
I think, there should be transaction 1 commiting before Full backup reading ends.
~ Lokesh Vij
Guidelines for quicker answers on T-SQL question
Guidelines for answers on Performance questions
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Post #1332678
Lokesh Vij
Lokesh Vij
Posted Thursday, July 19, 2012 10:00 PM
Ten Centuries
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Last Login: Yesterday @ 8:24 AM
Points: 1,176,
Visits: 1,253
Further to what Wayne has written:
In order to use this full back-up to restore the datbase, we also need to apply the transaction log on top of the restore. This is required for all the transactions that were committed after the full backup reading ends.
~ Lokesh Vij
Guidelines for quicker answers on T-SQL question
Guidelines for answers on Performance questions
Link to my Blog Post -->
www.SQLPathy.com
Follow me
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Post #1332680
mdaughtree
mdaughtree
Posted Thursday, July 19, 2012 10:35 PM
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Not a good question: because by your reasoning T1 would also be rolled back as well therefore
The changes from which transactions will be contained within the full backup?
All of them :)
Post #1332689
vk-kirov
vk-kirov
Posted Thursday, July 19, 2012 11:34 PM
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WayneS (7/19/2012)
see
http://technet.microsoft.com/en-us/magazine/2009.02.logging.aspx
for more about the UNDO portion of recovery
And see another brilliant Paul Randal's article for the detailed explanation about the subject of the QotD:
Understanding SQL Server Backups
Post #1332697
Koen Verbeeck
Koen Verbeeck
Posted Friday, July 20, 2012 12:38 AM
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I like the intent of the question, but alas poorly executed.
How to post forum questions.
Need an answer? No, you need a question.
What’s the deal with Excel & SSIS?
Member of
LinkedIn
. My blog at
LessThanDot
.
MCSA SQL Server 2012 - MCSE Business Intelligence
Post #1332719
Mookies
Mookies
Posted Friday, July 20, 2012 1:25 AM
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Group: General Forum Members
Last Login: Friday, May 17, 2013 5:16 AM
Points: 88,
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+1
Post #1332746
Christian Buettner-167247
Christian Buettner-167247
Posted Friday, July 20, 2012 1:57 AM
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Last Login: Yesterday @ 6:12 AM
Points: 2,526,
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I thought I had 2 Choices:
12:18 AM - Full backup
data
reading of QotDDatabase ends
12:19 AM - Transaction 4 on QotDDatabase commits
12:19 AM - Full backup
transaction log
reading of QotDDatabase happens
12:20 AM - Full backup of QotDDatabase ends
12:18 AM - Full backup
data
reading of QotDDatabase ends
12:19 AM - Full backup
transaction log
reading of QotDDatabase happens
12:19 AM - Transaction 4 on QotDDatabase commits
12:20 AM - Full backup of QotDDatabase ends
Just two of the possible interpretations though...
Best Regards,
Chris Büttner
Post #1332756
Stewart "Arturius" Campbell
Stewart "Arturius" Campbell
Posted Friday, July 20, 2012 2:26 AM
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Last Login: Yesterday @ 8:31 AM
Points: 3,129,
Visits: 4,312
Koen Verbeeck (7/20/2012)
I like the intent of the question, but alas poorly executed.
+2
____________________________________________
Space, the final frontier? not any more...
All limits henceforth are self-imposed.
“libera tute vulgaris ex”
Post #1332768
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