Jonathan Lewis wrote:
>
> "Mladen Gogala" <gogala_at_sbcglobal.net> wrote in message
> news:pan.2006.03.04.03.21.40.53245_at_sbcglobal.net...
> >
> > Solaris has a perversion called "intimate shared memory, which
> > allows processes to share page table as well as the page contents.
> > From Oracle 7.3 all the way to 8i there was a parameter called
> > "use_intimately_shared_memory", which was supposed to be set to true
> > on Solaris. That parameter would enable Oracle to use XXX-shared
> > memory and gain some performance. Another thing with which many
> > vendors were toying was the post-wait pseudo device, which was
> > faster then the semaphore operations. It was originally developed
> > by SGI but I've seen it on AIX and Solaris as well.
> > I do believe that Oracle was using classic shmget,shmat and similar
> > calls wherever available and would switch to specialized libraries,
> > based on parameters. Of course, I never worked for Oracle and I've
> > never seen the source code, so I don't really know.
> >
> > --
> > http://www.mgogala.com
> >
>
> Talking of intimate shared memory.
>
> Your earlier comment about Solaris being the one Unix
> platform that doesn't allocate the entire memory on startup
> is, I believe, only true if you have MPT enabled ISM
>
> --
> Regards
>
> Jonathan Lewis
> http://www.oracle.com/technology/community/oracle_ace/ace1.html#lewis
>
> The Co-operative Oracle Users' FAQ
> http://www.jlcomp.demon.co.uk/faq/ind_faq.html
>
> Cost Based Oracle: Fundamentals
> http://www.jlcomp.demon.co.uk/cbo_book/ind_book.html
some useful information in metalink notes 151222.1, 317257.1 and
268884.1
--
Connor McDonald
Co-author: "Mastering Oracle PL/SQL - Practical Solutions"
Co-author: "Oracle Insight - Tales of the OakTable"
web: http://www.oracledba.co.uk
web: http://www.oaktable.net
email: connor_mcdonald_at_yahoo.com
"Semper in excremento, sole profundum qui variat."
------------------------------------------------------------
Received on Fri Mar 10 2006 - 21:01:58 CST
