If you aren't experiencing performance problems, the best thing to do
is nothing.
>From the docs ( Designing and Tuning for Performance )
To determine whether your system is experiencing latch contention, begin
by determining whether there is LRU latch contention for any individual
latch.
SELECT CHILD#, SLEEPS / GETS RATIO
FROM V$LATCH_CHILDREN
WHERE NAME = 'cache buffers lru chain';
The miss ratio for each LRU latch should be less than 3%. A ratio above 3%
for any particular latch is indicative of LRU latch contention and should
be addressed.
You can determine the buffer pool to which the latch is associated as
follows:
SELECT NAME
FROM V$BUFFER_POOL
WHERE lo_setid <= child_latch_number
AND hi_setid >= child_latch_number;
Jared
Hamid Alavi <[EMAIL PROTECTED]>
Sent by: [EMAIL PROTECTED]
07/03/2002 08:58 AM
Please respond to ORACLE-L
To: Multiple recipients of list ORACLE-L <[EMAIL PROTECTED]>
cc:
Subject: db_block_lru_latches
List,
I have a question regarding db_block_lru_latches, I have read in some
book(can't remember) which the best number for this parameter is (number
of
CPU)*6 or db_block_buffers/50.
But these two result is diffrent,anybody have any idea what's the best
configuration for this parameter.
In my configuration it has been set to 1 as default and I have two CPU so
it
means it should be 6*2 = 12?is it right?
Thanks allot for your recommendation.
Hamid Alavi
Office 818 737-0526
Cell 818 402-1987
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