Performance problems - query on the copy of a table is faster than the orig

Hi all,
I have sql (select) performance problems with a specific table (costs 7800)(Oracle 10.2.0.4.0, Linux).
So I copied the table 1:1 (same structure, same data, same indexes etc. ) under the same area (database, user, tablespace etc.) and gathered the table_stats with the same parameters. The same query on this copied table is faster and the costs are just 3600.
Why for gods sake is the query on this new table faster??
I appreciate any idea.
Thank you!
Fibo
Edited by: user954903 on 13.01.2010 04:23

Could you please share more information/link which can elaborate the significance of using SHRINK clause.
If this is so useful and can shrink the unused space , why not my database architect has suggested this :).
Any disadvantage also?It moves the highwater mark back to the lowest position, therefore full tables scans would work faster in some cases. Also it can reduce number of migrated rows and number of used blocks.
Disadvantage is that it involves row movement, so operations which based on rowid are permitted during the shrinking.
I think it is even better to stop all operations on the table when shrinking and disable all triggers. Another problem is that this process can take a long time.
Guru's, please correct me if I'm mistaken.
Edited by: Oleg Gorskin on 13.01.2010 5:50

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