RE: what is "kfk: async disk IO"?
- From: D'Hooge Freek <Freek.DHooge@xxxxxxxxx>
- To: "martin.a.berger@xxxxxxxxx" <martin.a.berger@xxxxxxxxx>, Oracle-L Freelists <oracle-l@xxxxxxxxxxxxx>
- Date: Tue, 7 Dec 2010 10:42:23 +0100
Martin,
The "kfk: async disk IO" seems to be linked to the io_submit system call.
You could check your number of async io processes.
But don't look at the number of occurrences to determine how "heavy" an event
is, look at the time spend. There is no relation between number of occurrences
and time spend.
Regards,
Freek D'Hooge
Uptime
Oracle Database Administrator
email: freek.dhooge@xxxxxxxxx
tel +32(0)3 451 23 82
http://www.uptime.be
disclaimer: www.uptime.be/disclaimer
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From: oracle-l-bounce@xxxxxxxxxxxxx [mailto:oracle-l-bounce@xxxxxxxxxxxxx] On
Behalf Of Martin Berger
Sent: dinsdag 7 december 2010 9:50
To: Oracle-L Freelists
Subject: what is "kfk: async disk IO"?
Hi,
can anyone please hint me to some information about
kfk: async disk IO ?
A little query on v$sessions gave me
USERNAME EVENT
COUNT(*)
------------------------------
-------------------------------------------------- ----------
APPS ges message buffer allocation
98
APPS CSS operation: action
2
APPS Streams AQ: waiting for messages in the queue
9
SYS SQL*Net message to client
1
APPS SQL*Net message from client
147
APPS kfk: async disk IO
1646
as kfk: async disk IO is the bigest contributor, I'd like to investigate a
little bit.
for the records: 11.2.0.1 - 2 node RAC - RedHat 5.4 Linux 64-bit. (yes, it's
EBS - but don't ask me the exact pach level, please - I assume 11.5.10???)
thnx
Martin
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