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Insert into table through dblink very slow after upgrade database from 11.2.0.2 to 11.2.0.4

edited Oct 8, 2018 10:16AM in SQL Performance (MOSC) 9 commentsAnswered

Hi all!

After I upgrade the database from 11.2.0.2. to 11.2.0.4, Queries through dblink perform very slow (more than 15 mins), which were previously worked quickly in 11.2.0.2 (less than a minute). I'm trying to insert into a local table from a remote database via dblink. While running query, i see event "sql*net message from dblink" with expectations that can hang very long. I tried to gather stats on both databases, gathered statistics on the full database, data dictionary and fixed objects, but nothing helped.

What could happen after the upgrade database...please help guyzz

SELECT stg2.ACCOUNT_NUMBER,

       stg2.sub_request_id,

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