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Oracle PL/SQL Tuning tips

Oracle Tips by Burleson Consulting


There are several proven techniques for improving the speed of PL/SQL execution and they are presented below in order of importance:

Use bulk collect:  When reading-in lots of related rows, bulk collect can run 10x faster than a conventional loop.  This tuning is possible because Oracle reduces context switches into a single operation.

Use forall:  When loading a table from an array, the forall operator is 10x faster than a conventional SQL insert statement.  Again, this is because of the reduction of context switching.

Use SQL analytics:  Many advanced data operations can be done without using PL/SQL and are readily available as a SQL built-in function.

Use implicit cursors:  Implicit cursors are faster in PL/SQL than explicitly defining cursors


The following PL/SQL tuning Tips are from the outstanding book "Oracle PL/SQL Tuning: Expert Secrets for High Performance Programming" by Dr. Tim Hall, Oracle ACE of the year, 2006:

Other PL/SQL references:


For a complete overview of Oracle PL/SQL, see the book "Easy Oracle PL/SQL Programming".  It's only $19.95 and has a downloadable code depot:



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Note: This Oracle documentation was created as a support and Oracle training reference for use by our DBA performance tuning consulting professionals. 

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