memory usage

From: rvaede <rvaedex23_at_gmail.com>
Date: Thu, 1 Mar 2012 05:56:49 -0800 (PST)
Message-ID: <b99930ec-3477-48ef-b5cd-0a25bcbcc654_at_m2g2000vbc.googlegroups.com>

I have a server Redhat 4 and running Oracle 11 thats slow and consumming a lot of memory and its constant. Server has 16 GB of RAM.
I am a linux administrator so I am not familiar with the Oracle config files.
I also noticed that the cached is consumming about 9 GB. Would you have any advise on how to tackle this.

top - 08:48:27 up 33 days, 22:45, 1 user, load average: 0.22, 0.31, 0.43
Tasks: 109 total, 1 running, 108 sleeping, 0 stopped, 0 zombie Cpu(s): 0.2%us, 0.2%sy, 1.9%ni, 97.7%id, 0.0%wa, 0.0%hi, 0.1%si, 0.0%st
Mem: 16435720k total, 15975740k used, 459980k free, 171268k buffers
Swap: 8193140k total, 116k used, 8193024k free, 9881732k cached

  PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
12893 oracle 18 0 2804m 984m 5448 S 4.7 6.1 171:21.72 java
32023 oracle 18 0 3594m 1.5g 5504 S 3.0 9.7 100:39.68 java
 1181 oracle 18 0 755m 301m 12m S 0.3 1.9 4:31.23 java

 1557 root      10  -5     0    0    0 S
0.3              0.0   3:26.96 kjournald
11364 oracle    15   0 1569m 175m 3820 S    0.3            1.1
32:50.70 java
32579 oracle    21   0 3358m 1.2g 5264 S      0.3             7.9

57:14.52 java Received on Thu Mar 01 2012 - 07:56:49 CST