Re: Query performance dramatically different



Dusan, the fast version is obviously sending the query to the remote
site to be ran.  You can find the SQL being passed in the OTHER column
of PLAN_TABLE.  The second plans is issuing several remote queries so
it is likely full scanning on some of these.  Some suggestions:

You might want to look at the session settings for all session
modifiable database parameters to make sure these are not different.
This is just an expansion of Sybrand's suggestion.
..
Verify that RLS is not in play

Verify that all users are looking at the same local and remote objects
(synonymns and link users)

HTH -- Mark D Powell --

.



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