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Why does explain differ from explan analyze?

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I have a query that if I do "explain" shows an other plan than if I do
"explain analyze" with that same query (immediately after the explain).

Is that possible, and if so, why? Does it have to do something with
vacuum?

TIA

-- 
Groeten,

Joost Kraaijeveld
Askesis B.V.
Molukkenstraat 14
6524NB Nijmegen
tel: 024-3888063 / 06-51855277
fax: 024-3608416
web: www.askesis.nl


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