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Restart Log Backups


Restart Log Backups

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Steve Jones
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Comments posted to this topic are about the item Restart Log Backups

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Got burned by this one. Very interesting question, good job Steve.


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too quick on the trigger - owned.
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Happy to be enlightened about that myth. It definitely worth two points.
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Agggghhhhh :-P

Good question and a very good learning point, thanks
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Good Question, explanation scripts were good Smile
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Good question.

However just because I could get away with a differential backup, the 'once bitten twice shy' part of me would always go for a full backup unless there was some overriding driver (time to backup?) pushing me to take a differential backup. It simplifies any future recovery of the database (full backup plus log file(s) vs full backup plus differential backup plus log files).

Call me old fashioned if you like.
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Thanks for the question Steve. I was surprised to see the number of incorrect answers. I hardly ever administer DBs, mostly design and programming. Maybe the lack of certainty about the right answer helped in this case. It made me slow down and think it through. Too bad I don't do that in all cases. ;-)

(Edited to fix non-spellcheckable typo.)

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I got led astray by the error message. Since it said there was no current database backup, I thought that meant you couldn't do a differential backup at all (since there was no full backup to "diff" against). Moral - error messages don't always say what they mean...
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Duncan Pryde (6/28/2012)
I got led astray by the error message. Since it said there was no current database backup, I thought that meant you couldn't do a differential backup at all (since there was no full backup to "diff" against). Moral - error messages don't always say what they mean...


To follow on from this point, the message you get when performing a diff backup against a database where a full backup has not been taken is:

Msg 3035, Level 16, State 1, Line 1
Cannot perform a differential backup for database "xyz", because a current database backup does not exist. Perform a full database backup by reissuing BACKUP DATABASE, omitting the WITH DIFFERENTIAL option.
Msg 3013, Level 16, State 1, Line 1
BACKUP DATABASE is terminating abnormally.

Seems quite similar to the log backup message in the way it refers to a current database backup, but this time actually means that there is no current backup. Crazy
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