RE: using a lot of temporary tablespace with large sort area size

From: Mohammad Rafiq <rafiq9857_at_hotmail.com>
Date: Fri, 07 Jun 2002 08:48:23 -0800
Message-ID: <F001.00477A0C.20020607084823@fatcity.com>

This query will help to see type of sort....for 8i above

select user,segtype,extents from v$sort_usage;

Regards
Rafiq

Reply-To: ORACLE-L_at_fatcity.com
To: Multiple recipients of list ORACLE-L <ORACLE-L_at_fatcity.com> Date: Fri, 07 Jun 2002 07:38:26 -0800

Paula,

With so much data, Oralce (or Oracle, if you prefer) might be hash joining your tables and writing temp hash segments.

What is your hash_area_size?

jack silvey

• Paula_Stankus_at_doh.state.fl.us wrote:
  > Guys,
  >
  > Have 20Gb and 16CPUS available on host. Need to do
  > large full-table
  > scans/joins to create materialized view. Since I
  > have to do the full-table
  > scans of large tables - decided to use parallel
  > query option. Eliminated
  > significant I/O contention by using DIRECT IO.
  > Using very very large
  > sort_area_size, however, still writing out
  > significant segments to temporary
  > tablespace which doesn't make sense to me. Any
  > ideas?
  >
  >
  

  ---

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MOHAMMAD RAFIQ


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Author: Mohammad Rafiq
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Received on Fri Jun 07 2002 - 11:48:23 CDT