ORA-01555 snapshot too old when querying an active data guard database via dblink

I am facing a problem in my Active data guard Database for reporting purpose.i am querying an active data guard database via dblink but a get "ORA-01555 snapshot too old".
both databases versions are 11.2.0.3.0.
Under investigation, it seems to be a bug.
Does anyone have a solution, otherwise i'll have to reports on production database

 

For a start check the UNDO_RETENTION parameter and a correctness of its value for yours of real conditions.
If parameter contains correct value and UNDO of the sufficient size, then you pass to search of problem sql.

 

Thanks for your quick reply, the UNDO_RETENTION and the UNDO tablespace have the correct values. when i query the production database using a dblink the ORA-01555 is gone. but when is query the standby database (also using a dblink) i face the "snapshot too old".Oracle says its a bug and the database (used to query the stby database) must be upgraded to 11.2.0.3 and i did it but no way the problem persist

 

You found or you know this problem sql-query ?
You can provide this request here?