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

From: <Paula_Stankus_at_doh.state.fl.us>
Date: Fri, 07 Jun 2002 08:53:39 -0800
Message-ID: <F001.00477A44.20020607085339@fatcity.com>

Guys,

Note:
Oracle does not recommend using the HASH_AREA_SIZE parameter unless the instance is configured with the shared server option. Oracle recommends that you enable automatic sizing of SQL working areas by setting PGA_AGGREGATE_TARGET instead. HASH_AREA_SIZE is retained for backward compatibility. Any opinions on how well PGA_AGGRE... works versus using specific parameters?  

-----Original Message-----
Sent: Friday, June 07, 2002 11:38 AM
To: Multiple recipients of list ORACLE-L size

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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Received on Fri Jun 07 2002 - 11:53:39 CDT