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I was just starting to work on a post on column statistics, using one of my favorite metadata functions: sys.dm_db_stats_properties(), when I realized something was missing. The function requires a stats_id value, which is available from sys.stats. However, Read More...
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This post is basically to answer a question asked in class this week: How can we get the last statistics update date for ALL user tables in a database? After working on the query for a while, I realized that the new metadata function I posted about here Read More...
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In a post about 4 1/2 years ago , I gave you my version of a replacement for the old pre-2005 pseudotable syscacheobjects . I called it sp_cacheobjects and created it as a view in the master database. With the sp _ prefix, the view can be accessed from Read More...
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Back when the lock manager was rewritten for SQL Server 7, and row level locking was added to the product, the procedure sp_indexoption gave us the ability to turn OFF either row or page locks or both, for one particular index, or for a table and all Read More...
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This Friday is the last of my summer seminars. On August 27, I am presenting on plan caching, plan reuse and recompile and plan cache metadata. This is one of my favorite topics to talk about, because a lot of the information is not very widely known, Read More...
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When SQL Server first introduced table and index partitioning in SQL 2005, it was the same version that all the metadata changed. So I decided that I could learn a lot about metadata and a lot about the organization and storage of partitions if I tried Read More...
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As I mentioned last October, my PASS preconference seminar was a whole day about the transaction log . I told the attendees all kinds of things about the structure of the log, and told them about one of the best tools for exploring the structure: the Read More...
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In my last post, I told you I'd post something technical before I left for Sweden. I almost made it. I wrote this in the Seattle airport, but wasn't able to post it until I got to Stockholm. For as long as I've been working with SQL Server, I've been Read More...
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Way back in the olden days, prior to SQL Server 7, I already knew that the lock manager was one of the most complex and resource intensive parts of SQL Server. Keeping track of every lock held, who was waiting for that lock, who could be granted the lock, Read More...
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Finally, a real geeky post. I received two questions in as many weeks about what really happens to existing partitions when you alter the underlying partition function. The big question being… does altering a partition function cause any data movement? Read More...
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I am teaching the SQL 2008 version of my course for the first time this week. My life is still is disarray and spare time is practically non-existent. During the evenings after I class I am trying to get caught up on several projects that I fell way behind Read More...
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I just today found out about something that was in plain sight in the Books Online... but the documentation is so vast, I haven't discovered everything yet. I blogged about clearing a single plan from cache in SQL Server 2005 a while back, and mentioned Read More...
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I've been running some tests with the new SQL Server 2008 configuration option 'optimize for ad hoc workloads' which is intended to reduce cache bloat due to holding onto plans for single use ad hoc queries. This option will allow a new type of cached Read More...
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You're probably aware that the metadata interface changed completely in SQL Server 2005, and we no longer have direct access to the system tables. Instead, Microsoft provided us with two sets of views: the catalog views and the compatibility views. The Read More...
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As you might know, metadata is one of my favorite topics, and I've written quite a bit about metadata and system objects. A very frequent question is: What exactly IS a system object? There are quite a few different definitions you could use. You could Read More...
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