Slow (to none) performance on SQL 2005 after attaching SQL 2000 database?

Without any information about the schema, the query or the size of the tables we really cannot guess anything. If you can post the output of the SET STATISTICS TIME ON and SET STATISTICS IO ON on 2005 vs. 2000 we could start a discussion...

You need to go back to the 2000 server, run a full backup and then restore that to 2005.

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