I am little confused about this issue to. I am working on Oracle 9.2.0.3 on Solaris 9 (64 bits) platform. I did not set sga_max_size parameter and I see it set. I am not sure what it means and what kind of problem it will cause me.
I have pga_aggregate_target is set for 512MB and it seems it is not counted in this count. I know it is a separate space in the memory. Since this is a new system for me, I am little concerned that Oracle does not chock on me. --- Kirtikumar Deshpande <[EMAIL PROTECTED]> wrote: > It does not work as advertised, in AIX either... I played with this > in AIX 5L. > > > - Kirti > > > --- "Hately, Mike (LogicaCMG)" <[EMAIL PROTECTED]> wrote: > > Stephen, > > > > The documentation is pretty wooly regarding this issue but the way > it seems > > to be intended to work is this: > > At startup Oracle will allocate an SGA sized as specified in the > > sga_max_size parameter. This is to ensure that the system has > enough memory > > accomodate what you see as a maximum requirement for the SGA. > > After it's allocated this and started the database it should > deallocate any > > memory it holds over and above that required to store the > components of the > > SGA. In some platforms/versions this deallocation doesn't occur. > Solaris for > > example behaves like this unless you move to version 8. > > It's possible that your version of Tru64 has a similar limitation > or that > > you're seeing a bug. > > To my mind though, Oracle Support's claim that this is expected > behaviour is > > a bit of a cop out. This is certainly not the way it was supposed > to work. > > The concept guide states the following: > > > > "The SGA can grow in response to a database administrator > statement, up to > > an operating system specified maximum and the SGA_MAX_SIZE > specification." > > > > and > > > > "Oracle can start instances underconfigured and allow the instance > to use > > more memory by growing the SGA components, up to a maximum of > SGA_MAX_SIZE" > > > > Both of these statements imply that the unused memory is supposed > to be > > released back to the operating system. > > The way that this feature operates on your system it allows you to > juggle > > storage backwards and forwards between caches which is still useful > but not > > 'what it says on the box'. > > > > I'd ask Oracle under what cirtcumstances this is normal behaviour. > It's not > > the way the software is intended to work so maybe it's a platform > > limitation. > > > > In order to give you a better idea of what Oracle thinks it's SGA > is using > > you can query the following views : > > > > - V$SGA_CURRENT_RESIZE_OPS: > > Information about SGA resize operations that are currently in > progress. > > An operation can be a grow or a shrink of a dynamic SGA > component. > > > > - V$SGA_RESIZE_OPS: > > Information about the last 100 completed SGA resize operations. > > This does not include any operations currently in progress. > > > > - V$SGA_DYNAMIC_COMPONENTS: Information about the dynamic > components in > > SGA. > > This view summarizes information based on all completed SGA > resize > > operations since startup. > > > > - V$SGA_DYNAMIC_FREE_MEMORY: > > Information about the amount of SGA memory available for future > dynamic > > SGA resize operations. > > > > > > Hope this helps, > > Mike Hately > > > > > > __________________________________ > Do you Yahoo!? > Yahoo! SiteBuilder - Free, easy-to-use web site design software > http://sitebuilder.yahoo.com > -- > Please see the official ORACLE-L FAQ: http://www.orafaq.net > -- > Author: Kirtikumar Deshpande > INET: [EMAIL PROTECTED] > > 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: [EMAIL PROTECTED] (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). ===== Mohammed Shakir CompuSoft, Inc. 11 Heather Way East Brunswick, NJ 08816-2825 (732) 672-0464 (Cell) (732) 257-6001 (Home) __________________________________ Do you Yahoo!? Yahoo! SiteBuilder - Free, easy-to-use web site design software http://sitebuilder.yahoo.com -- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: Mohammed Shakir INET: [EMAIL PROTECTED] 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: [EMAIL PROTECTED] (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).
