Comments on Transaction Log files are not safe to delete2013-05-07T13:39:52Zhttp://itknowledgeexchange.techtarget.com/sql-server/transaction-log-files-are-not-safe-to-delete/feed/atom/By: MrdennyMrdennyhttp://itknowledgeexchange.techtarget.com/sql-server/?p=763#comment-3822010-03-10T19:08:41Z2010-03-10T19:08:41ZSorry, 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: RamamRamamhttp://itknowledgeexchange.techtarget.com/sql-server/?p=763#comment-3812010-03-10T17:51:38Z2010-03-10T17:51:38ZI 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: MrdennyMrdennyhttp://itknowledgeexchange.techtarget.com/sql-server/?p=763#comment-3752010-03-09T03:35:31Z2010-03-09T03:35:31ZDifferential 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.
]]>By: RamamRamamhttp://itknowledgeexchange.techtarget.com/sql-server/?p=763#comment-3722010-03-08T20:48:13Z2010-03-08T20:48:13ZHey 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?