Re: sizing sort_area_size

> I have been doing some alter sessions to improve performance of gigabyte
sized 'minus' operations. How do I tell if this is helping other than completion time?
>
> I believe that if LIOs to PIOs ratio improves with the SAME query then
sort_area_size has helped right?(notice Im not trying to improve my cache/hit ratio).

If you see less direct IO waits on your temporary tablespace, then increasing s_a_s has helped.

>
> I get this from v$sess_io.
>
> how do I tell how much temp tablespace my session uses? I cant find a
statistic for it? I see that I used up all my PGA since PGA size and PGA max size are equal in v$sesstat.

select * from v$sort_usage where sid = <sid>;

> anything else I can look at?

Activity on temp tablespace from v$tempstat.. but it's only good enough for comparing with baselines..

Tanel.

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Author: Tanel Poder
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