Re: sizing sort_area_size

> That gives you only the current use of sort segments. The same applies
> to reasoning based on v$sort_usage and V$TEMP_SPACE_HEADER. The only
> True Way(TM) of tuning sorts is by using v$sysstat and v$sesstat values,

I think tuning sorts based on "in-memory sort" vs "not-in memory sort" calculations might be ok in simple OLTP envivronments, but in modern DW and OLAP world they give too simplistic overiew of what's happening in database. I'd definitely add events 10032 and 10033 trace for tuning big sorts (v$tempstat and even 10046 trace with waits can be somewhat useful as well).

Tanel.

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Author: Tanel Poder
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