Database Tuning (MOSC)

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after upgrade to 12c, "hard parse" problem

edited Oct 6, 2016 5:19AM in Database Tuning (MOSC) 5 commentsAnswered

Hello,

We have an applicaion which runs well in 11gR2, but upgrading to 12c,
all queries become slow.

The top wait events: “Hard Parse Due to Literal Usage” and ”Latch Free Waits”.

what we do, change parameter as below:

         DISK_ASYNCH_IO=TRUE  and  FILESYSTEMIO_OPTIONS=ASYNCH
         OPEN_CURSORS=1200 and SESSION_CACHED_CURSORS=100

*increase open_cursors from 300 to 1200
*increate SESSION_CACHED_CURSORS to 100


but, still slow,

1. is this issue was introduced by the upgrade to 12c oracle databasea?
2.  any similar experience. Any solution?

Thank you very much.

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