Re: "Bad" object ids in x$bh?

You should be joining the obj column
to the dataobj# column of obj$.
(that's data_object_id in dba_objects
rather than object_id). Unfortunately it is a non-indexed join, so can be a little inefficient.

This is also going to give you some funny numbers because logical objects (obj#) can share the same physical object (dataobj#), for example tables in a cluster,

Other reasons why the obj# and dataobj#
may differ are - truncation or moving of tables, and probably some of the maintenance operations on partitioned tables.

Some of the other funny numbers ca. 2^32 will be rollback segments, some will be internally generated temporary tables from temp table transformations.

Regards

Jonathan Lewis
http://www.jlcomp.demon.co.uk

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• Original Message ----- To: "Multiple recipients of list ORACLE-L" <ORACLE-L_at_fatcity.com> Sent: Monday, December 01, 2003 9:29 PM

>
> Anybody know what the blocks in x$bh are that don't map to rows in
> DBA_OBJECTS? I have 172 objects in x$bh that I can't account for.
>
> SQL> SELECT count(obj), count(object_id)
> 2 FROM (SELECT DISTINCT bh.obj, ob.object_id
> 3 FROM sys.x_$bh bh,
> 4 dba_objects ob
> 5 WHERE bh.obj = ob.object_id(+));
>
> COUNT(OBJ) COUNT(OBJECT_ID)
> ---------- ----------------
> 2243 2071
>
>
>
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-- 
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