Re: buffer cache -> and an empty v_$BH

in versions of oracle prior to v8.x, the v$bh view was dependent on a fixed table called ext_to_objs, which contained a static copy of info on objects from the data dictionary. to refresh the ext_to_objs table, rerun the "catparr.sql" script, which is located in "$ORACLE_HOME/rdbms/admin" periodically...

>From v8.x onward, the ext_to_objs table is obsolete and v$bh (and dependent
views such as v$cache and v$ping) read directly from the data dictionary... ----- Original Message -----
To: "Multiple recipients of list ORACLE-L" <ORACLE-L_at_fatcity.com> Sent: Wednesday, June 12, 2002 1:08 AM

> With some changes (v_$bh instead of x_$bh, objd instead of obj) the '
> buffers distribution by objects ' script was worked BUT MY v_$bh IS EMPTY.
> Any idea why?
>
>
> -----Original Message-----
> To: Multiple recipients of list ORACLE-L <ORACLE-L_at_fatcity.com>
> Date: miercuri 12 iunie 2002 05:32
>
>
> First query does exactly this, but can be very slow, I mean very.
> Second query runs much faster, but care needs to be taken about CLUSTERs,
> all objects in cluster share the same data_object_id.
>
> Alex.
>
> -- buffers distribution by segments
> select
> count(*) buffers
> ,e.tablespace_name
> ,e.owner||'.'||e.segment_name||' ('||e.segment_type||')' segment
> from
> sys.x_$bh b
> ,sys.dba_extents e
> where b.file# = e.file_id
> and b.dbablk between e.block_id and e.block_id+e.blocks-1
> group by
> e.owner||'.'||e.segment_name||' ('||e.segment_type||')'
> ,e.tablespace_name
> order by 1 desc, 2, 3
> ;
> --
>
> -- buffers distribution by objects
> select
> count(*) buffers
> ,b.obj d_obj_id
> ,o.owner||'.'||o.object_name||' ('||object_type||')' object
> from
> sys.x_$bh b
> ,sys.dba_objects o
> where o.data_object_id = b.obj
> group by b.obj, o.owner||'.'||o.object_name||' ('||object_type||')'
> order by 1 desc, 2, 3
> ;
> --
>
>
>
>
> -----Original Message-----
> Sent: Tuesday, June 11, 2002 6:08 PM
> To: Multiple recipients of list ORACLE-L
>
>
>
> Hi Guys ,
> IS there any way I can find what is occupying how much of buffer cache .
> Like .. what table is taking most of space etc .
>
> Thanks ,
> Bp
>
> --
> Please see the official ORACLE-L FAQ: http://www.orafaq.com
> --
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> INET: Admin.ISISAFBX01.IS_at_mail.mfinante.gv.ro
>
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-- 
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-- 
Author: Tim Gorman
  INET: Tim_at_SageLogix.com

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