Re: max parallel query

Tanel,
You are right. There is a param parallel_automatic(I don't remember exact name as I don't have access to database) which should be set to true and let system decide how many pq slave to be used. For max_parallel_server default is 5 and can be set to higher number which memory and cpu can handle. It is faster because it uses all system resources at a given time.

Rarallel process can be used for large batch jobs during off-peak time.

Regards
Rafiq

Reply-To: ORACLE-L_at_fatcity.com
To: Multiple recipients of list ORACLE-L <ORACLE-L_at_fatcity.com> Date: Thu, 18 Sep 2003 08:39:44 -0800

There is no simple magic formula how many parallel slaves you should have. It all depends on your CPU and IO utilization. Yes, utilization, because if your CPUs or IO are running at their limits already, you won't benefit from parallel execution at all. In fact PX may make the situation even worse, because it's designed to give you the results the fastest way, not the most efficient way.

Tanel.

• Original Message ----- To: "Multiple recipients of list ORACLE-L" <ORACLE-L_at_fatcity.com> Sent: Thursday, September 18, 2003 6:15 PM

> We run multiple instances on the same server. My understanding is
max_parallel_servers should be set to 4 x CPU. We have 4 CPUs which means 16.
>
> however, does this take into account multiple instances on the same
server?
>
>
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