Re: Tuning unknown applications

 

I wish it was easy tuning the SQLs. Lots of the programmers know how to add index to speed up queries and know that indexes should not be used sometimes.  What they give us is much more difficult queries. They throw complex queries at us DBAs and we do not know where to start, with some of the queries very long.  People kept advising me to read the concepts manual. I have read it a few times, it does not have what I require to tune these queries.

On Wed, Mar 23, 2011 at 5:19 PM, Tim Gorman <tim_at_evdbt.com> wrote:

Don't bother learning the application, focus on what the users say is hurting them. Step #1) look for the SQL statements taking tons of elapsed-time or response-time, #2) focus on the worst two or three SQL statements, #3) fix them, #4) implement the fix in production, and #5) repeat all over again starting from step #1.

Best to use SQL tracing on specific programs identified by users as performing poorly.  Check out white papers on www.method-r.com on tuning methodology and consider buying the book "Optimizing Oracle Performance" by Millsap and Holt (O'Reilly, 2003).

On 3/23/2011 3:44 PM, Ram Raman wrote:

List,
When DBAs are put in charge of unknown applications not developed in house or put in charge of third party COTS applications, how do we go about learning the systems and tune such systems.  This is an open ended question, but when I am asked to tune things, I am not sure how I would start without knowing the processes and data structure.
Thanks.

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