Home Forums SQL Server 2005 Backups tran log backup confused 2.5gb log file but 70gb log backup size RE: tran log backup confused 2.5gb log file but 70gb log backup size

  • June 9, 2012 at 11:03 am

    #1499036

    lawson2305 (6/9/2012)

    Ok I have a question I have a 116gb DB the full backup ends up around 70.5GB in size I then perform a transaction log backup which the log file is 2.5GB in size but the log backup ends up being 71.5GB in size.

    This is sql 2005 latest sp.

    the db is in bulk logged recovery model.

    Since the database is using the bulk logged recovery model, it looks like you may have had minimally logged operations. When you back up the t-log, the actual extends updated are backed up to the t-log backup. This keeps the t-log itself small but the backup can be much larger.