Jonathan,
WILLING IMMEDIATE
IMMEDIATE IMMEDIATE
NAME GETS MISSES TO WAIT % GETS
MISSES REQUEST % SLEEPS
=============== =========== ========= =========== ===========
=========== =========== =========
redo copy 11448 0 0 599170378
405208 .0676281764 0
redo allocation 6809468 247548 3.635350074 597056922
17812410 2.983368812 11018
Thanks.
-----Original Message-----
Jonathan Lewis
Sent: Friday, January 09, 2004 3:35 PM
To: Multiple recipients of list ORACLE-L
One interpretation of increased red latch contention
and log buffer space waits is that more work is being
done more quickly - so the log writer can't keep up.
This could mean:
a) the log writer has slowed down
b) the database writer(s) have speeded up, so there
is less time lost on write complete waits, free space
waits, and (side effect) buffer busy waits.
So the symptoms could be positive or negative, and
we don't have enough relevant information to say
which. Depending on the nature of the application,
and the number and duration of sync waits, you could
address the log buffer space waits by increasing the
size of the log buffer.
Are the redo latch waits allocation latch or copy latch ?
Regards
Jonathan Lewis
http://www.jlcomp.demon.co.uk
The educated person is not the person
who can answer the questions, but the
person who can question the answers -- T. Schick Jr
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----- Original Message -----
Now, the Sr DBA here is screaming about the performance since I made the
change, in particular, he says he's seeing high redo latch contention
and redo log buffer waits which he says validates his contention that we
need to get back to
using DBWR_IO_SLAVES.
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