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Concurrency event in Oracle 11.2.0.4

in Database Administration (MOSC) 5 commentsAnswered ✓

Hello,

I have used EM13C to monitor database (version 11.2.0.4 64bit in Oracle Linux) daily and recently I seen some concurrency events appear in database server. It look like:


The first thing I checked to see if there is a session locking other sessions but I didn't see any locking sessions. I go to details from EM, and saw the event is "cursor pin S wait on X"


I checked links from google, it's about system parameters like, e.g. I need to increase value of session_cached_cursor and set below parameters:

_optimizer_use_feedback=false

_optimizer_adaptive_cursor_sharing=false

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