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 12:13:27 -0800
Message-ID: <F001.00477E2B.20020607121327@fatcity.com>

Man significantly improved perf. by setting hash_area_size for session. Okay so guys have read in metalink says hash_area_size is 2* sort_area_size by default - is this not true? Most be the case that it isn't true.

-----Original Message-----
Sent: Friday, June 07, 2002 12:54 PM
To: Multiple recipients of list ORACLE-L

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-----
<mailto:jack_silvey_at_yahoo.com> ]
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 - 15:13:27 CDT