Oracle-L: Re: Tuning instance for batch processing

From: Mark Richard <mrichard_at_transurban.com.au>
Date: Thu, 13 Feb 2003 14:45:39 -0800
Message-ID: <F001.0054CFC9.20030213144539@fatcity.com>

Stefan,

Are you looking at tuning in terms of Oracle parameters or rewriting SQL? I guess one of the first things to consider is: Will the server be doing anything else at the same time? If the batch jobs are the only thing running then you tuning should probably focus more on execution time than execution efficiency. For example, look at things like parallel queries to load the box and reduce overall execution time.

Other than that the usual rules apply:

Use trace and TKPROF to see what's happening.
Look at using bind variables in queries that are repeated often to reduce the parse count.
Look at processing a group of records in a single statement rather than using loops in program logic if at all possible.
Look at I/O - do you have the load balanced well across datafiles / disks.
If running on UNIX run sar or top or something similar to determine if the server is working hard. If not, perhaps you can run jobs in parallel.
Are you doing anything unnecessary (ie: executing a statement within a loop that will return the same value each time).

Even though #5 seems a little silly it can occaisionally work a treat. I was aked to tune a very ugly query once because a batch job was running for 2 hours. The query, whilst very ugly, ran in under 500ms. Looking at the program logic showed it was being called about 12,000 times though and was guaranteed to return the same value each time. Running it once and storing the result in a variable reduced the batch to under 5 minutes.

Regards,

Mark.

                                                                                                                   
                    Stefan Jahnke                                                                                  
                    <Stefan.Jahnke       To:     Multiple recipients of list ORACLE-L <ORACLE-L_at_fatcity.com>       
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                    Sent by:             Subject:     Tuning instance for batch processing                         
                    root_at_fatcity.c                                                                                 
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                    14/02/2003                                                                                     
                    01:49                                                                                          
                    Please respond                                                                                 
                    to ORACLE-L

Hi list

Does anyone know of any good white papers online (or maybe a Metalink Note ID, I couldn't really find the right thing) about tuning an Oracle instance for batch processing ?

Thanks,

Stefan Jahnke
Consultant
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Author: Mark Richard
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Received on Thu Feb 13 2003 - 16:45:39 CST