RE: library cache lock

From: "Bobak, Mark" <Mark.Bobak@xxxxxxxxxxxxxxx>
To: <oracle-l@xxxxxxxxxxxxx>
Date: Wed, 2 Jun 2004 09:57:41 -0400
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@xxxxxxxxxxxxx [mailto:oracle-l-bounce@xxxxxxxxxxxxx]On 
Behalf Of David Sharples
Sent: Wednesday, June 02, 2004 9:40 AM
To: oracle-l@xxxxxxxxxxxxx
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@xxxxxxxxxxxxx [mailto:oracle-l-bounce@xxxxxxxxxxxxx] On 
Behalf Of Khedr, Waleed
Sent: 02 June 2004 14:10
To: oracle-l@xxxxxxxxxxxxx
Subject: RE: library cache lock

 

The metalink has answers for similar issues.

 

-----Original Message-----
From: David Sharples [mailto:dsharples@xxxxxxxxxxxxxxxxxxxxx]
Sent: Wednesday, June 02, 2004 8:44 AM
To: oracle-l@xxxxxxxxxxxxx
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
RE: library cache lock

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