Home Forums SQL Server 2008 SQL Server 2008 Administration Huge DIFF Backup, Normal T-Log Backups RE: Huge DIFF Backup, Normal T-Log Backups

  • April 7, 2013 at 8:28 am

    #1604253

    homebrew01 (4/6/2013)

    I have a 55 Gig database, and the differential backup for yesterday was 32 Gig !! It was about 5 gig the day before

    So, I assumed I could look at my transaction log backups and find a huge T-log backup to identify what time of day something big happened. But my t-logs, every 15 minutes, show 1 backup > 1 gig, and all the others quite small, and similar to other days this week.

    What can make a huge Diff backup, without generating huge t-log backup(s) ?

    T-Log backups that occur every 15 minutes happen 96 times a day. If you divide 32 by 96, the average T-Log size is only 0.3333.

    --Jeff Moden

    RBAR is pronounced "ree-bar" and is a "Modenism" for Row-By-Agonizing-Row.
    First step towards the paradigm shift of writing Set Based code:
    ________Stop thinking about what you want to do to a ROW... think, instead, of what you want to do to a COLUMN.

    Change is inevitable... Change for the better is not.

    Helpful Links:
    How to post code problems
    How to Post Performance Problems
    Create a Tally Function (fnTally)