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How Does sql_trace=true change things?

edited May 24, 2010 4:37AM in Database Tuning (MOSC) 2 commentsAnswered
 Has anyone experienced a change in query performance (but not a change in execution plan) when turning sql_trace on?
I have been trying to diagnose a query performance problem and have noticed that the query's performance is two or three orders of magnitude worse when I turn sql_trace on, and then performance is just fine when sql_trace is turned off.

This is on 64bit Oracle 9.2.0.7.0.

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