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RE: A VLDB contest

Luca Canali

2006-08-30

Replies:
Hi Kevin,

From my largest DB:

POOL      NAME                   BYTES
------------ -------------------------- ----------
shared pool ASM extent pointer array   185352360

I imagine this memory is strictly related to X$KFFXP, correct me if I am
wrong.

Thanks,
L.

PS:
From the same DB:

SQL> select sum(TOTAL_MB) from v$asm_diskgroup_stat;

SUM(TOTAL_MB)
-------------
  24398576

Does this mean that Oracle is using on average 9 bytes per extent ?
________________________________

From: oracle-l-bounce@(protected)
[mailto:oracle-l-bounce@(protected)
Sent: Wednesday, August 30, 2006 1:39 AM
To: Bobak, Mark; ORACLE-L
Subject: RE: A VLDB contest


Right, the ASM instance gives the pointer array info to the
consumer instances where it is cached in the shared pool.

I've not seen one iota of discussion on this list about how
Oracle maps a data block to an extent within an ASM diskgroup.
Must not be an interesting topic?

It is indeed using these pointers. Such mapping is never free. Volume
managers have always had to do that--but have always stored
such mappings in kernel memory. No FUD intended here. I just
wanted to get people curious about the topic.




________________________________

 From: Bobak, Mark [mailto:Mark.Bobak@(protected)]
 Sent: Tuesday, August 29, 2006 4:30 PM
 To: kevinc@(protected)
 Subject: RE: A VLDB contest
 
 
 I don't have an 'ASM extent pointer array' at all in my ASM
instance....
 
  1 select * from v$sgastat
  2 where name like '%ASM%'
  3* order by bytes
 SQL> /
 
 POOL      NAME                   BYTES
 ------------ -------------------------- ----------
 shared pool ASM rollback operations       2592
 shared pool ASM map operations          3360
 shared pool ASM db client             11840
 shared pool ASM buffer object          37288
 shared pool ASM file                75328
 
 
 
 In my database instance that relies on ASM, however.....
 
 
  1  select * from v$sgastat
  2  where name like '%ASM%'
  3* order by bytes
 SQL> /
 
 POOL      NAME                   BYTES
 ------------ -------------------------- ----------
 shared pool ASM rollback operations       2592
 shared pool ASM map operations         16856
 shared pool ASM file                19200
 large pool  ASM map operations hashta    393216
 shared pool ASM extent pointer array    9527624
 
 
 -Mark
   

 --
 Mark J. Bobak
 Senior Oracle Architect
 ProQuest Information & Learning

 Ours is the age that is proud of machines that can think and
suspicious of men who try to. --H. Mumford Jones, 1892-1980

 

________________________________

 From: oracle-l-bounce@(protected)
[mailto:oracle-l-bounce@(protected)
 Sent: Tuesday, August 29, 2006 7:24 PM
 To: ORACLE-L
 Subject: A VLDB contest
 
 


 Does anyone actually have ASM "put to the test" as they say?
Anyone
 have huge ASM extent pointer array areas within their shared
pool? Anyone
 have "ORA-4031-creeping syndrome" ?

 For instance:
       select * from v$sgastat;
 POOL      NAME                   BYTES
 ------------ -------------------------- ----------
  shared pool ASM extent pointer array 287097144

 Anyone see 1GB or more?



 Kevin Closson
 Chief Architect, Oracle Database Solutions
 PolyServe, Inc
 kevinc@(protected)
 http://www.polyserve.com/oracle_consolidation.php
<http://www.polyserve.com/oracle_consolidation.php>
 http://www.polyserve.com/oracle_rac_clusters.php
<http://www.polyserve.com/oracle_rac_clusters.php>


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