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分类: Oracle

2012-12-21 09:21:49

Problem Description: We are receiving the below warning during db startup:
WARNING: kqlclo() has detected the following :
Non-existent object 37336 NOT deleted because an object
of the same name exists already.
Object name: PUBLIC.USER$

This is caused by the SMON trying to cleanup the SYS.OJB$.
SMON cleans all dropped objects which have a SYS.OBJ$.TYPE#=10.
This can happen very often when you create an object that have the same name as a public synonym.

When SMON is trying to remove non-existent objects and fails because there are duplicates,
multiple nonexistent objects with same name.
This query will returned many objects with same name under SYS schema:

select o.name,u.user# from user$ u, obj$ o where u.user# (+)=o.owner# and o.type#=10
and not exists (select p_obj# from dependency$ where p_obj# = o.obj#);

To cleanup this message:

Take a full backup of the database - this is crucial. If anything goes wrong during this procedure,
your only option would be to restore from backup, so make sure you have a good backup before proceeding.
We suggest a COLD backup. If you plan to use a HOT backup, you will have to restore point in time if any problem happens

Normally DML against dictionary objects is unsupported,
but in this case we know exactly what the type of corruption,
also you are instructing to do this under guidance from Support.

Data dictionary patching must be done by an experienced DBA.
This solution is unsupported.
It means that if there were problems after applying this solution, a database backup must be restored.

1. Set event 10052 at parameter file to disable cleanup of OBJ$ by SMON

EVENT="10052 trace name context forever, level 65535"

2. Startup database in restricted mode

3. Delete from OBJ$, COMMIT

SQL> delete from obj$ where (name,owner#) in ( select o.name,u.user# from user$ u, obj$ o
where u.user# (+)=o.owner# and o.type#=10 and not exists (select p_obj# from
dependency$ where p_obj# = o.obj#) );

SQL> commit;

SQL> Shutdown abort.

4. remove event 10052 from init.ora

5. Restart the database and monitor for the message in the ALERT LOG file oracle官网
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