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ORA-04021: timeout occured while waiting to lock object

Posted on 2001-07-05
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Last Modified: 2007-11-27
I get the following error when trying to reload or drop a specific Java class <classname> from an Oracle 8.1.7 DB using the loadjava or dropjava utility...

ORA-04021: timeout occured while waiting to lock object <classname>

As far as I know, the class is not in use by anything else.  I still continue to get this message after about a day of waiting.  Why might this be happening and more importantly, how can I stop this error from occuring?

Thanks!
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Question by:basilisk14
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6 Comments
 
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Expert Comment

by:vanmeerendonk
ID: 6255812
I think a session is still having a lock on your object.
Try viewing v$lock if this is true.
Kill the session that is locking your object.

If the session doesn't disappear and is marked for being killed and the PMON hasn't enough resources to clear the session, you have to bring down the dbase. (or try using the ORAKILL utility, see metalink).
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Author Comment

by:basilisk14
ID: 6255993
Could you please clarify about how I would go about doing these things?  I am not the DBA, but I could let him know the solution if it is more specific.  Thanks.
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Author Comment

by:basilisk14
ID: 6256004
Could you please clarify about how I would go about doing these things?  I am not the DBA, but I could let him know the solution if it is more specific.  Thanks.
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Accepted Solution

by:
vanmeerendonk earned 50 total points
ID: 6258508
sorry, it was midnight when You asked me.
Well, with
select s.sid
,substr (s.osuser, 1, 10) username, substr (o.object_name, 1, 20) object
,      l.lmode, s.process, substr(s.program, 1, 25) program
from   v$lock l, all_objects o, v$session s
where  o.object_id = l.id1
and    s.sid       = l.sid
and l.type = 'TM'
 
you can look at the locks. With
ALTER SYSTEM KILL SESSION '<SID>,<SERIAL#>'
you kill the session.

But with all of the above you have to have the appropriate grants! I think it's better for you to identify the lock and inform the DBA (he really should know what to do)

As a developer there's nothing more to do that identify and wait.

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Author Comment

by:basilisk14
ID: 6260057
When I run the query I get "table or view does not exist".  Do you know why that might be?
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Author Comment

by:basilisk14
ID: 6275300
Sorry for the delay...thanks.
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