Check Metalink. You will find all sorts of docs on /3G I am surprised to hear it didn't work on the test system. Watch out for hyperthreading on cpus. This affects alot of hidden parameters. I had to take off the auto sga and decrease my sga target quite a bit. No not applicable on 64 bit Windows. I did have issues with /PAE switch and performance. --- Shamless self promotion.... You might want to check out my article on turning my windows woes into wow article on Metalink. I had alot of Windows issues I needed to work through. I am working with Orakill now to kill session vs using alter session kill. I found on windows killing sessions didn't always work and orakill does. I will add my orakill info to my article next week hopefully. Kathy Richard Saints <saints.richard@xxxxxxxxx> wrote: Hello to you all, I'm planning to activate the /3GB flag on a Windows server running Oracle Database, in order to extend the memory that can be used by Oracle. The server has the following characteristics: HP Proliant DL380 2 x Pentium Xeon 3,2 GHz 4 GB of RAM HP Smart Array SCSI controller 2x36GB SCSI RAID 1 internal discs with 2 logical drives: C drive for OS D drive for Logs 4x146 GB SCSI RAID 5 internal discs with 1 logical drive: F drive for data Paging size on C drive (2048-4096) SO: Windows 2000 Advanced Server SP4 The Oracle SGA Target is 1336 MB I would like to know if there is any special care that I should take, before I activate this flag on boot.ini. I read the Oracle Documentation, but I didn't found any particular aspect. I'm asking this because I had a bad experience with a test server where with the /3G flag was activated and the Oracle instance didn't startup. I still haven't figured out why. Thanks for all your attention. Best Regards, Ricardo. --------------------------------- Boardwalk for $500? In 2007? Ha! Play Monopoly Here and Now (it's updated for today's economy) at Yahoo! Games.