Comments on: Transaction Log files are not safe to delete http://itknowledgeexchange.techtarget.com/sql-server/transaction-log-files-are-not-safe-to-delete/ Tue, 07 May 2013 13:39:52 +0000 hourly 1 By: Mrdenny http://itknowledgeexchange.techtarget.com/sql-server/transaction-log-files-are-not-safe-to-delete/#comment-382 Mrdenny Wed, 10 Mar 2010 19:08:41 +0000 http://itknowledgeexchange.techtarget.com/sql-server/?p=763#comment-382 Sorry, Yesterday was kind of a ruff day, I thought I got all your questions answered. But at least you got the info you needed. :)

]]> By: Ramam http://itknowledgeexchange.techtarget.com/sql-server/transaction-log-files-are-not-safe-to-delete/#comment-381 Ramam Wed, 10 Mar 2010 17:51:38 +0000 http://itknowledgeexchange.techtarget.com/sql-server/?p=763#comment-381 I realize that I wasn’t clear in my question but you answered me anyway. I specifically wanted to know if point-in-time recovery can be done for periods where there are differential backups but not tlogs and the answer is no.
Thanks again – great blog!

]]> By: Mrdenny http://itknowledgeexchange.techtarget.com/sql-server/transaction-log-files-are-not-safe-to-delete/#comment-375 Mrdenny Tue, 09 Mar 2010 03:35:31 +0000 http://itknowledgeexchange.techtarget.com/sql-server/?p=763#comment-375 Differential backups aren’t just a rollup of the transaction logs. They are actually a copy of each record which has had an internal flag changed.

1. Yes, provided that the point in time is after the differential was taken.
2. Yes.

]]> By: Ramam http://itknowledgeexchange.techtarget.com/sql-server/transaction-log-files-are-not-safe-to-delete/#comment-372 Ramam Mon, 08 Mar 2010 20:48:13 +0000 http://itknowledgeexchange.techtarget.com/sql-server/?p=763#comment-372 Hey Denny,
I’ve got a 15GB DB and I’m using weekly full backups with 15m tlog backups. I keep four weeks worth of fulls and tlogs as we are still seeing a lot of base level application code changes and are being extra cautious in terms of point-in-time recovery ability.
I was planning on adding in daily differential backups so that I can toss my old tlogs mostly to reduce the number of files to manage but also to speed up recovery events. Given that differentials are really a rolling up of tlogs since the last full back up I am wondering if:
1 Can I do point-in-time recovery using: the newest full backup prior to the time I want + the newest differential backup prior to the time I want + tlogs as necessary from that differential backup to the actual point-in time.
2 This is probably answered by the first question’s answer but for clarity sake: is it ok to delete the tlogs that are older than differentials?
thanks!

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