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
Next public appearance2:
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____UK___February
The Co-operative Oracle Users' FAQ
http://www.jlcomp.demon.co.uk/faq/ind_faq.html
----- 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.
--
Please see the official ORACLE-L FAQ: http://www.orafaq.net
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Author: Jonathan Lewis
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