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Message Posted: Wed, 23 Mar 2005 @ 12:18:54 GMT


     
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Subj:   Re: Purging Data from tables
 
From:   Dieter Noeth

Naveen Ram PrasannaKambhoji wrote:

  1. Tables should be cleaned up once in a month and Volume is too huge around 50 Million records I need to delete.  


  2. Window for the maintainance is 2 - Half peek Hours.  


  3. It's a 32 AMP system  


  4.Currently data already exist in the table and the applications/reports make extensive use of this table so we defined PI on different set of Columns.  


  5. I came to know that we cant use a Multi Load delete because dateid is not a PI and MultiLoad delete will work only with WHERE condition on PI Columns.  


You can't use a BEGIN [IMPORT] MLOAD, but a BEGIN DELETE MLOAD: Faster than a SQL delete because there's no Transient Journal and no rollback in case of failure (just restart the job).

Is your DateID column a date or an integer? Then you should think about a Partitioned PI.

But do some test before: This may boost your deletes ans some queries, but other queries may slow down, it depends...


Dieter



     
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