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library cache: mutex X event blocking other session

940856Feb 6 2013 — edited Feb 7 2013
Hi All,

I am using 11Gr2. Here , I have got one issue , where I am getting "library cache: mutex X" wait events when querying the package name from dba_objects.
I also generated the system state dump 266 , but unable to find the holder of the same mutex. any idea , how to read these dumps properly or any document/blog ,where I can get this. I also refer on metalink document (Note: 444560.1) , but it did not work for me.

one session , I queried 

SQL> select SID , OWNER , OBJECT from v$access where OBJECT='PACK_OPTIO';

another session :

       SID    SERIAL# USERNAME                       STATUS   EVENT
---------- ---------- ------------------------------ -------- -----------------------------------
       321      51640 SYS                            ACTIVE   library cache: mutex X
Regards
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Locked on Mar 7 2013
Added on Feb 6 2013
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