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  • Misunderstandings about the COPY_ONLY backup option

    The COPY_ONLY option for the backup command never ceases to cause confusion. What does it really do? And in what way does it affect your restore sequence? Or not? There are two sides to this. Restoreability and how the GUI behaves: Restoreability If you specify COPY_ONLY for a full backup, it will not affect the following differential ...
    Posted to Tibor Karaszi (Weblog) by TiborKaraszi on February 18, 2016
  • Geek City: Did You Know … that not everything you know is actually true!

    Software changes, new versions not only add new features, they also change internal behavior of old features,  and not all the changes are documented!  And how often, after a software upgrade, do you go through and test everything you knew was true, to make sure it is STILL true after the upgrade? I write books about the SQL Server ...
    Posted to Kalen Delaney (Weblog) by Kalen Delaney on November 27, 2013
  • Geek City: What Triggered This Post?

    I’d really like to get another post up onto my much neglected blog before the end of 2012. This will also start one of my New Year’s resolutions, which is to write at least one blog post a month. I’m going to tell you about a change in SQL Server that wasn’t announced in any “What’s New” list that I ever saw, perhaps because it was just a chance ...
    Posted to Kalen Delaney (Weblog) by Kalen Delaney on December 31, 2012
  • Follow-up Answers for my Australia Classes

    I was out of the country for the last two weeks of March, delivering classes in Brisbane and Sydney, which were organized by WardyIT.  It was a great visit and there were 24 terrific students! As is sometimes (perhaps often?)  the case, there were questions posed that I couldn’t answer during class, so here are a couple of follow-up ...
    Posted to Kalen Delaney (Weblog) by Kalen Delaney on April 4, 2012
  • Geek City: What gets logged for SELECT INTO operations?

    Last week, I wrote about logging for index rebuild operations.  I wanted to publish the result of that testing as soon as I could, because that dealt with a specific question I was trying to answer. However, I actually started out my testing by looking at the logging that was done for a different operation, and ended up generating some new ...
    Posted to Kalen Delaney (Weblog) by Kalen Delaney on March 15, 2011
  • Geek City: What gets logged for index rebuild operations?

    This blog post was inspired by a question from a future student. Someone who was already booked for my SQL Server Internals class in June asked for some information on a current problem he was having with transaction log writes causing excessive wait times during index rebuild operations when run in ONLINE mode. He wanted to know if switching to ...
    Posted to Kalen Delaney (Weblog) by Kalen Delaney on March 8, 2011
  • Point-in-time restore of database backup?

    SQL Server 2005 added the STOPAT option for the RESTORE DATABASE command. This sounds great - we can stop at some point in time during the database backup process was running! Or? No, we can't. Here follows some tech stuff why not, and then what the option is really meant for: A database backup includes all used extents and also all log ...
    Posted to Tibor Karaszi (Weblog) by TiborKaraszi on December 28, 2010
  • Why we never want to trick SQL Server into rebuilding a log file

    ''Never'' is a strong word, so let me say that we really really want to avoid it, if at all humanly possible. In short, we will have a (potentially) broken database, both at the physical level and at the logical level. Read on. Just to be clear, when I refer to a ''log file'' here, I'm talking about a transaction log file, an .ldf file. Ever so ...
    Posted to Tibor Karaszi (Weblog) by TiborKaraszi on October 14, 2010
  • Restore database to the point of disaster

    This is really basic, but so often overlooked and misunderstood. Basically, we have a database, and something goes south. Can we restore all the way up to that point? I.e., even if the last backup (db or log) is earlier than the disaster? Yes, of course we can (unless for more extreme cases, read on), but many don't realize/do that, for some ...
    Posted to Tibor Karaszi (Weblog) by TiborKaraszi on March 27, 2010
  • Are log records removed from ldf file for rollbacks?

    Seems like a simple enough question, right? This question (but more targeted, read on) was raised in an MCT forum. While the discussion was on-going and and I tried to come up with answers, I realized that this question are really several questions. First, what is a rollback? I can see three different types of rollbacks (there might be more, of ...
    Posted to Tibor Karaszi (Weblog) by TiborKaraszi on March 22, 2010
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