Oracle-L: 9i RAC Scripts.// LONG

From: Jack van Zanen <JACK_at_QUANTSYSTEMS.NL>
Date: Wed, 01 Oct 2003 02:13:46 -0800
Message-ID: <F001.005D1AD5.20031001021346@fatcity.com>

Hi All,

I am trying to figure out what and why to monitor in a 9i RAC environment. Could any of you guys please comment on the following:

V$FALSE_PING is an Oracle9i Real Application Clusters view. This view displays buffers that may be getting false pings. That is, buffers pinged more than 10 times that are protected by the same lock as another buffer that pinged more than 10 times. Buffers identified as getting false pings can be remapped in "GC_FILES_TO_LOCKS" to reduce lock collisions.

Note:
Setting this parameter to any value other than the default will disable Cache Fusion processing in Oracle9i Real Application Clusters.

!!!!!Does this mean we should not temper with this???

I guess the number OF ROWS returned BY this query should be AS close to zero AS possible, Right?
>From the rows returned I guess the forced_reads/writes should be as close to zero as possible, Right ?

Select name
, partition_name
, kind
, file#
, block#
, status
, xnc
, forced_reads
, forced_writes

>From GV$FALSE_PING

V$CACHE_TRANSFER This is an Oracle9i Real Application Clusters view. The V$CACHE_TRANSFER view is identical to the V$CACHE view but only displays blocks that have been pinged at least once. This view contains information from the block header of each block in the SGA of the current instance as related to particular database objects.

select name
, partition_name
, kind
, file#
, block#
, status
, xnc
, forced_reads
, forced_writes

from gv$cache_transfer;

There are many views based on global cache etc.. That are not really clear to me what I can use to figure out cache fusion problems.

I did find in the documentation that information could be collected from v$sysstat about global cache/locks that can be used to calculate certain response times etc..

TIA Jack

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Author: Jack van Zanen
  INET: JACK_at_QUANTSYSTEMS.NL

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Received on Wed Oct 01 2003 - 05:13:46 CDT