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Oracle Tips 

by Burleson Consulting

The Data Warehouse Development Life Cycle

Parallelism And Oracle Data Warehousing

Parallel Index Building

SELECT /*+ FULL(employee_table) PARALLEL(employee_table, 4) */
employee_name
FROM
employee_table
SEE CODE DEPOT FOR FULL SCRIPT


If you are using SMP with many CPUs, you can issue a parallel request and leave it up to each Oracle instance to use its default degree of parallelism, as follows:

SELECT /*+ FULL(employee_table) PARALLEL(employee_table, DEFAULT, DEFAULT) */
employee_name
FROM
employee_table
SEE CODE DEPOT FOR FULL SCRIPT


The following several important init.ora parameters have a direct impact on parallel query:

* SORT_AREA_SIZE--The higher the value, the more memory available for individual sorts on each parallel process. Note that the SORT_AREA_SIZE parameter allocates memory for every query on the system that invokes a sort. For example, if a single query needs more memory and you increase the SORT_AREA_SIZE, all Oracle tasks will allocate the new amount of sort area, regardless of whether they will use all of the space.


This is an excerpt from "High Performance Data Warehousing".

If you like Oracle tuning, you may enjoy the book Oracle Tuning: The Definitive Reference , with over 900 pages of BC's favorite tuning tips & scripts. 

You can buy it directly from the publisher and save 30%, and get instant access to the code depot of Oracle tuning scripts.

 


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