Re: RE: Question on SGA

Actually it's not ultimately bad. I'd say it's rather good instead. When you initiate a process and allocate memory to it, it's actually just mapped to virtual memory in modern operating systems, meaning that a process which hasn't actually touched the memory it has allocated (thus unused memory), is available to others. When you are continuously paging in and out, this is usually bad performance wise, but if an idle process is kicked out of memory to have additional file system caching for example, this is good.

(I'm not an expert on operating systems, thus was only able to explain it on very general level)
Tanel.

• Original Message ----- To: "Multiple recipients of list ORACLE-L" <ORACLE-L_at_fatcity.com> Sent: Monday, July 28, 2003 4:29 PM

> if you dont have enough memory, it will be taken from virtual memory which
is very bad.
>
> if there is enough memory, Oracle will reserve its space from that first.
> >
> > From: "Naveen Nahata" <naveen_nahata_at_mindtree.com>
> > Date: 2003/07/28 Mon AM 07:59:24 EDT
> > To: Multiple recipients of list ORACLE-L <ORACLE-L_at_fatcity.com>
> > Subject: RE: Question on SGA
> >
> > I'm expecting a lot of innovative answers for this question
> >
> > :-)
> >
> > > -----Original Message-----
> > > From: Senthil Kumar D [mailto:senthilkumard_at_summitworks.com]
> > > Sent: Monday, July 28, 2003 3:04 PM
> > > To: Multiple recipients of list ORACLE-L
> > > Subject: Question on SGA
> > >
> > >
> > > Hi Group,
> > >
> > > I have a doubt. From where the SGA will be taken. From the
> > > RAM or from the
> > > virtual memory?
> > >
> > > regards,
> > > Senthil
> > >
> > > --
> > > Please see the official ORACLE-L FAQ: http://www.orafaq.net
> > > --
> > > Author: Senthil Kumar D
> > > INET: senthilkumard_at_summitworks.com
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-- 
Please see the official ORACLE-L FAQ: http://www.orafaq.net
-- 
Author: Tanel Poder
  INET: tanel.poder.003_at_mail.ee

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