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:
1) Use trace and TKPROF to see what's happening.
2) Look at using bind variables in queries that are repeated often to
reduce the parse count.
3) Look at processing a group of records in a single statement rather than
using loops in program logic if at all possible.
4) Look at I/O - do you have the load balanced well across datafiles /
disks.
5) 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.
5) 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
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Sent by: Subject: Tuning instance for batch
processing
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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
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