in linux, file system also maintains its cache, which gives us a feeling that whole memory getting filled up. infact when some other program requests for memory, the memory occupied by filesystem is automatically freed up and given to that process. top - 12:39:21 up 3 days, 20:23, 23 users, load average: 0.78, 1.04, 1.00 Tasks: 266 total, 5 running, 261 sleeping, 0 stopped, 0 zombie Cpu(s): 75.5%us, 5.6%sy, 0.0%ni, 16.6%id, 2.3%wa, 0.0%hi, 0.0%si, 0.0%st Mem: 1035676k total, 995916k used, 39760k free, 85536k buffers Swap: 2096472k total, 144k used, 2096328k free, 416648k cached there are some kernel parameters which control the amt of memory that always needs to be kept free. can't get that param name from top of my head. you can google for it vasu -----Original Message----- From: ora-apps-dba-bounce@xxxxxxxxxxxxx [mailto:ora-apps-dba-bounce@xxxxxxxxxxxxx] On Behalf Of Kenan Öztürk Sent: Friday, May 18, 2007 7:39 PM To: ora-apps-dba@xxxxxxxxxxxxx Subject: memory usage Hi all, on RedHat A.S 3.0/4.0 I observer that free memory amount is really low. I know that if it is swapping then there's a problem otherwise it is normal. bu where this ram going? After rebooting system and starting ebs services, i observe that ram usage is increasing and only 10-50 mb free memory remains! Regards, Kenan _____ Now that's room service! Choose <http://travel.yahoo.com/hotelsearchpage;_ylc=X3oDMTFtaTIzNXVjBF9TAzk3NDA3NT g5BF9zAzI3MTk0ODEEcG9zAzIEc2VjA21haWx0YWdsaW5lBHNsawNxMS0wNw--> from over 150,000 hotels in 45,000 destinations on Yahoo! Travel to find your fit.