Re: Time to read 6000 (block size 2k) blocks
- From: J.Velikanovs@xxxxxxxx
- To: oracle-l@xxxxxxxxxxxxx
- Date: Fri, 6 Aug 2004 17:22:07 +0300
UUUUUps!!!
!(21.86/6126)*1000 = 45,7ms/pio.!
Forget that I have told you. It is complicit rubbish.
I don?t know how I got 45,7.
The correct is 3,56 ms.
And it is looks definitely better then 45 ms.
Do not rush to sysadm ;) You need to look on the different optimization
area.
Please excuse my fault.
It is seems late Friday syndrome
Jurijs
+371 9268222 (+2 GMT)
============================================
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J.Velikanovs@xxxxxxxx
Sent by: oracle-l-bounce@xxxxxxxxxxxxx
06.08.2004 17:08
Please respond to oracle-l
To: oracle-l@xxxxxxxxxxxxx
cc:
Subject: Re: Time to read 6000 (block size 2k) blocks
(21.86/6126)*1000 = 45,7ms/pio.
By my experience everything what is below 20ms in general is OK.
High end need to be quicker ~10ms.
We have HP EVA solution implemented.
The response time is 5 ms, even in high load situations (There 12 CPU, RAC
configuration).
.
In your case 45 ms can be the problem.
I would discuss this with system administrators or supplier
representatives.
.
PS Do not forget about throughput of channels 180Mbit/s, 320Mbit/s,
1Gbit/s. Check sum of IO stream volumes.
Jurijs
+371 9268222 (+2 GMT)
============================================
Thank you for teaching me.
http://otn.oracle.com/ocm/jvelikanovs.html
jaysingh1@xxxxxxxxxxxxx
Sent by: oracle-l-bounce@xxxxxxxxxxxxx
06.08.2004 16:48
Please respond to oracle-l
To: oracle-l@xxxxxxxxxxxxx
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Subject: Time to read 6000 (block size 2k) blocks
Hi All,
The question may be wispy.
We have 14 CPU sun box,8i 2 node OPS. Not under heavy load.
In our case it is taking 21.86 sec for 6126 blocks (from disk)
db file sequential read 6126 0.29 21.86
Approximately how long it should take to read 6000 blocks?
call count cpu elapsed disk query current rows
------- ------ -------- ---------- ---------- ---------- ----------
----------
Parse 1 0.01 0.01 0 0 0 0
Execute 1 0.00 0.00 0 0 0 0
Fetch 2 11.39 41.98 6126 18805 0 1
------- ------ -------- ---------- ---------- ---------- ----------
----------
total 4 11.40 41.99 6126 18805 0 1
db file sequential read 6126 0.29 21.86
Thanks
Sami
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