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Ctrl-alt-geek

Matt Bowler is a DBA at Trade Me, and teaches database design and administration courses at the local institute of technology. A recent but avid discoverer of SQL Server, Matt is a regular contributor to forums at MSDN, Experts Exchange and SSC and he blogs at mattsql.wordpress.com.

Archives: October 2012

Don’t believe everything you read: Truncate table is not logged

Actually I’m not sure if anyone still believes this anymore. If you read the BOL description carefully it states that truncate de-allocates the pages rather than deleting the rows – meaning only the de-allocations are logged – resulting in far fewer log records. Incidentally this is also why the truncate… Read more

1 comments, 2,858 reads

Posted in Ctrl-alt-geek on 31 October 2012

Quick tip: Count table rows in a database, and locate those rows in the data files.

Here are a couple of quick database and table level queries that I have found useful lately.

How many rows in each table of a database?

The first temptation with this one was to use something like sp_MSforeachtable with a count(*), until I recalled that the catalog view sys.indexes has… Read more

0 comments, 536 reads

Posted in Ctrl-alt-geek on 30 October 2012

Querying database usage

A question that a DBA will often be asked is what databases are actively being used on my SQL Server? We get asked it all the time, usually as part of a consolidation or rationalisation project.

My solution to this is to query the sys.dm_db_index_usage_stats DMV, which maintains counters of… Read more

0 comments, 1,831 reads

Posted in Ctrl-alt-geek on 17 October 2012