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Message Posted: Wed, 11 Dec 2013 @ 09:36:18 GMT


     
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Subj:   Re: DBC AccessRights table is skewed
 
From:   Dave Wellman

Hi,

Yes, AccessRights will almost certainly be skewed and I've often seen it causing problems. This usually shows up with queries ending up in PARSING for many seconds (including minutes).

You can't 'fix' the skew but you can reduce the size of the table - which effectively reduces the skew.

As David Roth suggests, get rid of unecessary rows in the table and also use Roles. Both will significantly help.

Also remember that the clean-up process typically needs to be repeated. Most sites that I work with run it monthly. If you find that the number of rows in the table rapidly grows after a clean-up, check your batch work. If your batch work does the following: drop table, populate it (either via a load process or insert/select), change it to DELETE, populate.


Cheers,

Dave

Ward Analytics Ltd - Information in motion (www.ward-analytics.com)



     
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