Taking more time for retreving data from nested table

Hi
we have two databases db1 and db2,in database db2 we have number of nested tables were there.
Now the problem is we had link between two databases,whenever u firing the any query in db1 internally it's going to acces nested tables in db2.
For feching records it's going to take much more time even records are less in table . what would be the reason.
plz help me daliy we are facing the problem regarding the same

Please avoid duplicate thread :
quaries taking more time
Nicolas.
+< mod. action : thread locked>+

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<Modified the subject line>
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Moderator message : Spec/requirements dumping not allowed, show the work you have already done. Thread locked.
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Moderator message : Spec/requirements dumping not allowed, show the work you have already done. Thread locked.
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Taking more time for retreving data from nested table

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