[WBEL-users] Oracle 9i/10g on WBEL with Large amounts of RAM

[Mickael Maddison]

Hello Jay,

Please send your machine to my home address.  I'll gladly check it out for you!

I don't use Oracle, but from my experience, the RH line of Linux, and probably most, like to keep the RAM in a sort of 'soft reserved' state.  If Oracle uses 10GB at one time, even when the actual current use drops down to say 6GB, the 4GB that's now "unused" is still storing the info that it had from before.  Anytime a process (including Oracle) should come to need the 'unused' RAM, it will be cleaned and made available to the process. So long as you don't start seeing your swap space filling up when it shouldn't, you should be ok.

I've got a couple servers w 2GB RAM in them that behave just like this.  They show almost all the 2GB as used but as you see below, only ~1.2GB is active at the moment.  My swap is showing only 24MB of use.

Mem:  2060880k av, 2027612k used,   33268k free,       0k shrd,  189544k buff
                   1283904k actv,  447572k in_d,   30396k in_c

Hope that is true and helps.
Mike

Monday, September 20, 2004, 12:20:19 PM, you wrote:

JKS>             I was wondering if anyone has experienced
JKS> anymemory problems when running Oracle on WBEL with large amounts
JKS> of RAM installed. I have 16 GB of RAM on my DB server, and seem
JKS> to have run into some sort ofmemory leak.  Before I open an itar
JKS> with Oracle, I would like to know if anyonehas experienced the
JKS> same behavior.  

JKS> When I start my DB, I will have around 14 GB of RAM
JKS> freewhen I cat /proc/meminfo.  After about 2 days of use this is
JKS> down to about 2GB.  When I shut down the DB the RAM does not get
JKS> released.  I have to rebootto release the RAM.  I am not sure if
JKS> it is an Oracle issue or an OS problem.

JKS> Any advice on tuning WBEL for such large amounts of RAM or
JKS> anyhelp tracking down memory leaks would be appreciated.  I have
JKS> followed theinstruction for installing ORACLE on linux from
JKS> http://www.puschitz.com/OracleOnLinux.shtml

JKS>  

JKS>  

JKS>  

JKS>  

JKS> Regards,

JKS>  

JKS> Jay Slay, TivoliSupport Specialist

JKS> Robins, AFBGA.

JKS>  

JKS>  







-- 
Best regards,
 Mickael                            mailto:mike@kamloopsbc.com