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Don Burleson Blog 








Limitations on Oracle SQL processing?

Oracle Database Tips by Donald Burleson

Question:  I'm doing a "group by rollup" and I'm concerned that there may be limitations to the amount of processing that you can do within a SQL statement.

Answer: Oracle will always return an error message when SQL fails.  David Aldridge notes a limitation on GROUP BY when using materialized views that might apply.

"Oracle 's attempt to index all the columns of an aggregating materialized view fails when more than 32 columns are included in the GROUP BY, and the error ?ORA-01793: maximum number of index columns is 32″ is raised."

Mark Rittman notes a problem with invoking automatic query rewrite for materialized views when using GROUP BY ROLLUP:

"The problem is, that the query rewrite mechanism won't be able to make the connection between the GROUP BY / GROUP BY - ROLLUP used to request the summary on the relational data, and the SQL used to expose the analytic workspace data through the OLAP_TABLE function. It?ll never qualify for query rewrite"




If you like Oracle tuning, see the book "Oracle Tuning: The Definitive Reference", with 950 pages of tuning tips and scripts. 

You can buy it direct from the publisher for 30%-off and get instant access to the code depot of Oracle tuning scripts.



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