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Parallel Query in 10.2.0.4

edited Mar 31, 2009 6:49AM in Database Tuning (MOSC) 6 commentsAnswered
I am trying to implement parallel query on a database on which a previous DBA attempted parallel query and left some confusion behind.  I have several tables and indexes whose degree is 1 and others whose degree is zero.  What is the difference in behavior?  If your degree is 1, isn't serial processing being used?  So then what would be the significance of a degree of zero?  Or does a degree of zero mean never to use parallel query no matter what other settings are?

I was thinking of using a logon trigger so that each session has parallel query enabled (alter session force parallel query), but parallel DML and DDL is disabled.  When doing DDL, DBAs can change their individual sessions to use parallel DDL if necessary.

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