Why does my count(*) query time out but the inline view whose records it is counting does not?

Posted by RenderIn on Stack Overflow See other posts from Stack Overflow or by RenderIn
Published on 2010-05-11T15:36:47Z Indexed on 2010/05/11 15:44 UTC
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Can't figure this one out... when I execute a select query it shows an explain plan cost of ~4500 and takes ~3 seconds to return. When I wrap that query (no changes) inside of:

select count(*) from (
 /*query here*/
)

It times out. It's at 5 minutes and counting now.

I tried this in SQL Developer and Aqua Data Studio -- same results.

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