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Plan stability

ExorOct 23 2009 — edited Oct 23 2009
Hello,

I have a complex query (too complex to try to explain here) that executes relatively fast in 2 seconds.
However if I modify anything in the query text, add a space, add a carriage return, change the case of any word, it takes 150 seconds to execute.
Toad shows the same plan for both versions of the query.
I don't know where to start looking for causes or solutions. Do you gurus have any idea what can cause this behaiour?

Thank you,
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Locked on Nov 20 2009
Added on Oct 23 2009
#performance, #query
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