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Here are some tips on using Hash joins correctly. Let me know if you have any questions or need clarification on the contents in the url below.<br />
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<a href="http://www.dba-oracle.com/tips_oracle_hash_joins.htm" rel="ugc">http://www.dba-oracle.com/tips_oracle_hash_joins.htm</a><br />
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Here are some tips on using Hash joins correctly. Let me know if you have any questions or need clarification on the contents in the url below.

http://www.dba-oracle.com/tips_oracle_hash_joins.htm [http://www.dba-oracle.com/tips_oracle_hash_joins.htm]





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Can you share the SQL with us? And maybe information about indexes.
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Can you share the SQL with us? And maybe information about indexes.

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Hi Experts,<br />
<br />
&nbsp; I am facing very peculiar problem in tuning one specific table.<br />
&nbsp; I have one table which had 150 Million Records (47 GB size, non partitioned) and another approximately of same size also non partitioned.<br />
&nbsp;I need the data from both these tables and almost all the records will be meeting the join condition which is equijoin, so i prefer using Hash join with parallel 16.<br />
&nbsp;When i montor the process both the tables are ready within 30 mins but HASH join takes more than 8 hours to complete. <br />
I have explored following options for this but with no success.<br />
1. Workarea polciy to be auto and PGA_AGGREGATE_TARGET 3 GB<br />
2. Workarea policy manual, HASH_AREA_SIZE 100M with parallel 32 &nbsp;at session level<br />
<br />
&nbsp; Can anyone please throw some light on improving this hash join performance.
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Hi Experts,

  I am facing very peculiar problem in tuning one specific table.
  I have one table which had 150 Million Records (47 GB size, non partitioned) and another approximately of same size also non partitioned.
 I need the data from both these tables and almost all the records will be meeting the join condition which is equijoin, so i prefer using Hash join with parallel 16.
 When i montor the process both the tables are ready within 30 mins but HASH join takes more than 8 hours to complete. 
I have explored following options for this but with no success.
1. Workarea polciy to be auto and PGA_AGGREGATE_TARGET 3 GB
2. Workarea policy manual, HASH_AREA_SIZE 100M with parallel 32  at session level

  Can anyone please throw some light on improving this hash join performance.

How to improve performance of Hash Join in 9.2.0.7

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