RE: reading the SGA from my own program
- From: "Powell, Mark D" <mark.powell@xxxxxxx>
- To: "Oracle Discussion List" <oracle-l@xxxxxxxxxxxxx>
- Date: Mon, 21 Aug 2006 13:01:30 -0400
The primary point of directly reading shared memory is that by doing so
you bypass Oracle. So when the entire instance hangs and will not grant
new connections you can go around the problem and see what is happening
(or not happening as the case may be). You also avoid the latching
overhead required for accessing the shared memory structures via Oracle.
True, you may see some inconsistent data, but you will see it.
HTH -- Mark D Powell --
________________________________
From: oracle-l-bounce@xxxxxxxxxxxxx
[mailto:oracle-l-bounce@xxxxxxxxxxxxx] On Behalf Of Allen, Brandon
Sent: Monday, August 21, 2006 12:25 PM
To: tanel.poder.003@xxxxxxx; anjo.kolk@xxxxxxxxxxx;
jeremiah@xxxxxxxxxxx
Cc: Oracle Discussion List
Subject: RE: reading the SGA from my own program
Please forgive my ignorance, but what is the point of this
direct SGA access anyway? Why not just query v$session_event and/or
v$session_wait, or the underlying x$ tables?
Thanks,
Brandon
________________________________
From: oracle-l-bounce@xxxxxxxxxxxxx
[mailto:oracle-l-bounce@xxxxxxxxxxxxx] On Behalf Of Tanel Poder
Sent: Saturday, August 19, 2006 2:30 AM
To: anjo.kolk@xxxxxxxxxxx
Cc: jeremiah@xxxxxxxxxxx; 'Oracle Discussion List'
Subject: RE: reading the SGA from my own program
Also, if all you're interested in is the current wait state of a
session, then there's no real fundamental need to map those SHM segments
which do not contain the data you're interested in (as far as I
understand).
Tanel.
. . .
________________________________
From: oracle-l-bounce@xxxxxxxxxxxxx
[mailto: oracle-l-bounce@xxxxxxxxxxxxx
<mailto:oracle-l-bounce@xxxxxxxxxxxxx> ] On Behalf Of Jeremiah Wilton
Sent: Saturday, August 19, 2006 05:14
To: 'Oracle Discussion List'
Subject: reading the SGA from my own
program
I am trying to play around with reading the SGA
using my own program, as popularized by Kyle Hailey and Miladin
Modrakovic's papers and presentations. I am confused about where to
find x$ksusecst (session wait) and other items in the fixed area.
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