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DBCC INDEXDEFRAG and UPDATE STATISTICS

  • June 17, 2004 at 9:06 am

    #152190

    I just upgraded from the world of SQL 7 to SQL 2000 a few months.  I have recently found that Indexfrag to work far better in my case and I can schedule it to run pretty often like twice a week in the middle of the night.  I found INDEXDEFRAG to be much faster then REINDEX and the main thing is because the indexes are not rebuild, the trans log stays in check.  I have some really large tables and rebuilding the clustered indexes would make my trans grow to gigantic proportions.

    Now to my question .  Running DBCC REINDEX updates all my stats as well.  With INDEXDEFRAG, would I still need to run "update statistics" separately? Also how often should the stats be updated.

  • June 18, 2004 at 12:26 am

    #510960

    - do you  have autoupdate-stats on (at db level) ? just run it once in a while.

    We just run it once in a while (4 times a year) because autoupdatestats is on.

    - If your data dos not change that much in cardinality of data and number of rows, you might choose to run sp_updatestats just once. If you don't know its variation, schedule it once a month to start with.

    - don't forget to run dbcc updateusage ('yourdb') with countrows every now and then.

     

     

     

    Johan

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