Lee,
Are you sure you're specifying the right process? When I use truss -p on
my DBWR, it gives exactly what you need. In the following test, I used
truss (strace on my Linux machine) to show what DBWR did in response to
a "create table test as select * from dual; drop table test;" executed
in another session:
09:25:31 $ ps -ef | grep dbw
oracle 1133 1 0 Oct09 ? 00:00:01 ora_dbw0_V901
cvm 12013 11962 0 09:29 pts/0 00:00:00 grep dbw
09:25:32 $ strace -p 1133 -e trace=write,pwrite
--- SIGALRM (Alarm clock) ---
..
--- SIGALRM (Alarm clock) ---
pwrite(17, "[EMAIL PROTECTED]"...,
4096, 12234752) = 4096
--- SIGALRM (Alarm clock) ---
..
--- SIGALRM (Alarm clock) ---
09:27:09 $
By doing a "man pwrite", I can see the explanation of the pwrite return
value of 4096:
RETURN VALUE
On success, the number of bytes read or written is
returned (zero indicates that nothing was written, in the
case of pwrite, or end of file, in the case of pread), or
-1 on error, in which case errno is set to indicate the
error.
Therefore, my DBWR is writing 4,096 bytes at a time.
Cary Millsap
Hotsos Enterprises, Ltd.
http://www.hotsos.com
Upcoming events:
- Performance Diagnosis 101: 10/28 Phoenix, 11/19 Sydney
- SQL Optimization 101: 12/8-12 Dallas
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- Visit www.hotsos.com for schedule details...
-----Original Message-----
Robertson Lee - lerobe
Sent: Tuesday, October 21, 2003 9:34 AM
To: Multiple recipients of list ORACLE-L
Hi,
Oracle 9.2.0.3
AIX 5L
Is there a way of finding the block sizes that are being written from
the
database. We are experiencing write waits now, after solving our read
issues.
We have looked at truss -p on AIX and it doesn`t seem to show this.
Regards
Lee
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