RE: library cache lock

From: Bobak, Mark <Mark.Bobak_at_il.proquest.com>
Date: Wed, 2 Jun 2004 10:37:34 -0400
Message-ID: <4C9B6FDA0B06FE4DAF5918BBF0AD82CF03B45560@bosmail00.bos.il.pqe>

Hmm....actually, the way it is there, it will only show the blocker. If you want it to show the blocker and all the waiters, just comment out: 'and pn.kglpnmod != 0'.

-----Original Message-----

From: oracle-l-bounce_at_freelists.org [mailto:oracle-l-bounce_at_freelists.org]On Behalf Of Bobak, Mark Sent: Wednesday, June 02, 2004 9:58 AM
To: oracle-l_at_freelists.org
Subject: RE: library cache lock

David,

Try the following query to find the blocked sessions and which session is the blocker. Note that due to the order by, the first session should be the blocker.

-Mark

select /*+ ordered use_nl(lob pn ses) */

       decode(lob.kglobtyp, 0, 'NEXT OBJECT', 1, 'INDEX', 2, 'TABLE', 3, 'CLUSTER',
                      4, 'VIEW', 5, 'SYNONYM', 6, 'SEQUENCE',
                      7, 'PROCEDURE', 8, 'FUNCTION', 9, 'PACKAGE',
                      11, 'PACKAGE BODY', 12, 'TRIGGER',
                      13, 'TYPE', 14, 'TYPE BODY',
                      19, 'TABLE PARTITION', 20, 'INDEX PARTITION', 21, 'LOB',
                      22, 'LIBRARY', 23, 'DIRECTORY', 24, 'QUEUE',
                      28, 'JAVA SOURCE', 29, 'JAVA CLASS', 30, 'JAVA RESOURCE',
                      32, 'INDEXTYPE', 33, 'OPERATOR',
                      34, 'TABLE SUBPARTITION', 35, 'INDEX SUBPARTITION',
                      40, 'LOB PARTITION', 41, 'LOB SUBPARTITION',
                      42, 'MATERIALIZED VIEW',
                      43, 'DIMENSION',
                      44, 'CONTEXT', 46, 'RULE SET', 47, 'RESOURCE PLAN',
                      48, 'CONSUMER GROUP',
                      51, 'SUBSCRIPTION', 52, 'LOCATION',
                      55, 'XML SCHEMA', 56, 'JAVA DATA',
                      57, 'SECURITY PROFILE', 59, 'RULE',
                      62, 'EVALUATION CONTEXT',
                     'UNDEFINED') object_type,
       lob.kglnaobj object_name,
       pn.kglpnmod lock_mode_held,
       pn.kglpnreq lock_mode_requested,
       ses.sid,
       ses.serial#,
       ses.username
  from v$session_wait vsw,
       x$kglob lob,
       x$kglpn pn,
       v$session ses
 where vsw.event = 'library cache lock'

   and vsw.p1raw = lob.kglhdadr
   and lob.kglhdadr = pn.kglpnhdl
   and pn.kglpnmod != 0
   and pn.kglpnuse = ses.saddr
order by pn.kglpnmod desc, pn.kglpnreq desc /

-----Original Message-----

From: oracle-l-bounce_at_freelists.org [mailto:oracle-l-bounce_at_freelists.org]On Behalf Of David Sharples Sent: Wednesday, June 02, 2004 9:40 AM
To: oracle-l_at_freelists.org
Subject: RE: library cache lock

I searched (probably on wrong words) didn't return anything useful as I could see, can you show me a url?

From: oracle-l-bounce_at_freelists.org [mailto:oracle-l-bounce_at_freelists.org] On Behalf Of Khedr, Waleed Sent: 02 June 2004 14:10
To: oracle-l_at_freelists.org
Subject: RE: library cache lock

The metalink has answers for similar issues.

-----Original Message-----

From: David Sharples [mailto:dsharples_at_cerebrussolutions.com] Sent: Wednesday, June 02, 2004 8:44 AM
To: oracle-l_at_freelists.org
Subject: library cache lock

Hi, got a strange problem. I am trying to truncate a partition in a table, but it just hangs forever, it is waiting on a library cache lock. Anyone know why and how I can clear it - flushing the shared pool didn't help and there are no other sessions touching that table.

Thanks

Dave

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Received on Wed Jun 02 2004 - 09:34:47 CDT