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Message Posted: Wed, 10 Dec 2003 @ 15:03:29 GMT


     
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Subj:   DBQL Logging - How Much
 
From:   LeBlanc, James

Several customers have asked about DBQL query logging and a metric for understanding overhead. This information is highly summarized for the purpose of giving a quick review of overhead consumed by BEGIN QUERY LOGGING.

The answer to the questions requires an understanding of the basic difference between all-AMP operations and single/few AMP operations.

For all-AMP operations, even short ones, response time tests were not able to pick up any overhead any level of query logging enabled, including "all".

For single/few AMP operations one should expect to use summary logging as response time increases by a number close to 6% and instruction path length doubles.

I hope this answer reaches all that have asked.

Jim LeBlanc



     
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