Object Locked But Can't Find Session / Process Blocking?

Sep 5, 2012

I am on database 10.2.0.5, windows x64.

A developer calls me and tells me there are locks on 3 tables, and the locks are not released. So I run this to see which objects are locked by which session

select vlo.object_id, vlo.session_id, vlo.oracle_username, vlo.process
  , DECODE(vlo.LOCKED_MODE, 0,'NONE', 1,'NULL', 2,'ROW SHARE', 3,'ROW EXCLUSIVE', 4,'SHARE', 5,'SHARE ROW EXCLUSIVE', 6,'EXCLUSIVE', NULL) LOCK_MODE
  , do.owner, do.object_name, do.object_type

[code]...

When I run the query later, I sometimes get another session, but the lock stays. It seems here, that I am catching the same SID on new sessions, but it is probably a different serial # than the original session locking the table rows.

I get nothing from
select * from dba_waiters;
select * from dba_blockers;

Now why are those 3 tables row locked on some rows and I can't find the session responsible? The developer tells me his application crashed and the rows are locked since. So far ( keep in mind I am not a locking expert) the only way I found to release the locks is a DB bounce, its a test DB so no biggy.

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