Re: optimize hash join between 2 large tables

  • From: Mladen Gogala <mgogala@xxxxxxxxxxxxxxxxxxxx>
  • To: Paula_Stankus@xxxxxxxxxxxxxxx
  • Date: Fri, 21 Jan 2005 09:58:23 -0500

Paula_Stankus@xxxxxxxxxxxxxxx wrote:

>Other then use sort_area_size to sort in memory and parallel query what
>can be done to optimize a pull of 2 large tables joined together where
>most of the rows from both tables are selected???
You can put them in a 16K blocksize tablespace. That will speed up the 
full table scan, but may
also have some undesired consequences as Oracle will need to maintain 
another buffer pool, another
set of LRU latches, probably another DBWR and it can be quite an 
interesting thing in conjunction
with workarea_size_policy set to auto.

Mladen Gogala
Oracle DBA
Ext. 121


Other related posts: