Hi Harvinder, First off, there is no pga_target parameter. I'll assume you're referring to pga_aggregate_target. With it set to 200MB and expecting 900 dedicated server processes connecting concurrently, that's about 233017 bytes per server process for pga memory. That's WAY too small. Assuming that you have 2GB RAM, and you're ok w/ the 600MB you've allocated to sga_target, well, perhaps you could try bumping pga_aggregate_target to 900MB. But, even there, you're only at 1MB per server process. Unless you have VERY MODEST memory usage requirements, that's not going to be enough. You need a box with more memory. Shared server (aka MTS) is not a panacea. Also, are you using raw devices? If you're on cooked filesystems, are you using direct I/O? If not, the OS will use memory to cache your datafiles in the filesystem layer, and consume memory there too. Bottom line, you need more memory.... -Mark -- Mark J. Bobak Senior Oracle Architect ProQuest Information & Learning Ours is the age that is proud of machines that can think and suspicious of men who try to. --H. Mumford Jones, 1892-1980 -----Original Message----- From: oracle-l-bounce@xxxxxxxxxxxxx [mailto:oracle-l-bounce@xxxxxxxxxxxxx] On Behalf Of Harvinder Singh Sent: Friday, August 25, 2006 4:24 PM To: ORACLE-L Subject: SGA/PGA question Hi, We have 10.1.0.3 installed on sun solaris 10 having 2GB RAM and 2GB swap file. In our system 4-5 application starts at same time and each requires about 180 connections to the database. So about 900~ processes can be connected at the same time and we have set the following parameters: Processes = 1000 Pga_target = 200MB SGA_TARGET = 600MB We are using the dedicated server model and getting following error frequently and also notice that physical RAM drops to 0 MB free: Ora-12500 (unable to start the dedicated process) Since this is just a development box, so to fix this issue we are planning to move to MTS model. Is there any other way to solve this issue, if we have to go to the MTS model what should be the value of PGA and SGA to be set? Thanks --Harvinder -- //www.freelists.org/webpage/oracle-l -- //www.freelists.org/webpage/oracle-l