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Home -> Community -> Mailing Lists -> Oracle-L -> Re: Direct SGA Access
Direct SGA AccessDo we need permission from Oracle to attach? I am sure that many tools and features today are used in a way they were never intended ;-) and we do that also without their explicit permission.
It's not that difficult as long as you know what you are looking for. And it does vary, depending on platform, oracle release, 32bit, 64bit, and SGA size ( >2gb, or < 2gb)
-----Original Message-----
From: Cary Millsap [mailto:cary.millsap_at_hotsos.com]
Sent: Friday, April 11, 2003 3:04 PM
To: Multiple recipients of list ORACLE-L
Subject: RE: Direct SGA Access
Just an observation: In this context, there is no such thing as a "vendor with an intimate relationship with Oracle." Anyone who attaches to your SGA does so without Oracle Corporation's explicit permission.
...Well, except for the Oracle Enterprise Manager development group. But even some of those guys figured out how to map the SGA without help from Oracle Corporation (that is, they did it before they ever went to work for Oracle Corp).
Cary Millsap
Hotsos Enterprises, Ltd.
http://www.hotsos.com
Upcoming events:
-----Original Message-----
From: root_at_fatcity.com [mailto:root_at_fatcity.com] On Behalf Of Goulet, Dick
Sent: Friday, April 11, 2003 2:02 PM
To: Multiple recipients of list ORACLE-L
Subject: RE: Direct SGA Access
Mladen,
Thanks for taking the words almost out of my mouth. I may be a bit old fashioned, but I believe that the manufacturer of my truck put a red line on the Tach for a purpose. Will the engine blow up beyond that point, maybe not but your treading in waters your not meant to tread. The same goes for messing around in the SGA in my book. I have not seen an API or map of the SGA published by Oracle. Therefore if your messing around your on your own. If the DB is hung out to dry as one respondent stated, and Yes that has happen to me, then that's what you pay OTS for. I know they have methods and what not that will take you into those waters, but let them navigate for you & then tell you what happen. OH Yes, It';s fast, well if your needs are for sub second data from the SGA I think your problem is most likely elsewhere and even getting what you want is not going to make any difference. And if you really do want to get data from the SGA, go find a vendor with am intimate relationship with Oracle and but their product.
BTW: My basic reason for saying this is that I once tried to use C to extract VMS from a VAX. Well that worked pretty good, now I wonder can I?? Answer was, Yes you can. Ever see how fast a VAX 11-780 can shutdown corrupting every file on the disk drives?? Answer: DAMN FAST.
Dick Goulet
Senior Oracle DBA
Oracle Certified 8i DBA
-----Original Message-----
From: Gogala, Mladen [mailto:MGogala_at_oxhp.com]
Sent: Friday, April 11, 2003 12:19 PM
To: Multiple recipients of list ORACLE-L
Subject: RE: Direct SGA Access
The other solution would be to redefine a second. I am still inclined to consider a bigger box
before trying to shmat an SGA of a database.
-----Original Message-----
From: Cary Millsap [mailto:cary.millsap_at_hotsos.com]
Sent: Friday, April 11, 2003 11:54 AM
To: Multiple recipients of list ORACLE-L
Subject: RE: Direct SGA Access
Dick,
To answer your question about motive, the reason someone might want to is that unless you can poll the V$ structures 100 times per second, you miss important event occurrences. It's impossible to do this with SQL. Not difficult. Impossible.
One test that'll be documented in my book in a few months is a query upon a 50-row V$SESSION fixed view. Our 800MHz Linux server can only do about 65 queries/second. And that's just one of about 30 fixed views that would need to be queried. And that's just with 50 sessions going (not the hundreds that most people have).
Cary Millsap
Hotsos Enterprises, Ltd.
http://www.hotsos.com
Upcoming events:
-----Original Message-----
From: root_at_fatcity.com [mailto:root_at_fatcity.com] On Behalf Of Goulet, Dick
Sent: Thursday, April 10, 2003 4:59 PM
To: Multiple recipients of list ORACLE-L
Subject: RE: Direct SGA Access
Raj,
Why are you trying to access the SGA? There are plenty of dynamic performance views to extract data from & messing with the SGA may cause your DB to crash.
Dick Goulet
Senior Oracle DBA
Oracle Certified 8i DBA
-----Original Message-----
From: Jamadagni, Rajendra [mailto:Rajendra.Jamadagni_at_espn.com]
Sent: Thursday, April 10, 2003 5:39 PM
To: Multiple recipients of list ORACLE-L
Subject: Direct SGA Access
Has anyone been able to make direct SGA access work for 64 bit databases? My C knowledge is as good as my lisp knowledge, i.e. just about zero.
I tried playing with the xksuse.c, but all it does is dumps core ...
If anyone has done this successfully, could you please let me know what needs to be changed in the code?
Thanks in advance
Raj
-- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: Anjo Kolk INET: Anjo_at_oraperf.com Fat City Network Services -- 858-538-5051 http://www.fatcity.com San Diego, California -- Mailing list and web hosting services --------------------------------------------------------------------- To REMOVE yourself from this mailing list, send an E-Mail message to: ListGuru_at_fatcity.com (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).Received on Fri Apr 11 2003 - 19:48:38 CDT
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