Query on Linux 'top' command for oracle user

This is the output of 'top' command in one of my linux server hosting One 
Oracle instance with 600MB SGA and 400MB PGA. One one instance is up in 
this server.
top - 14:36:37 up 4:26, 3 users, load average: 0.05, 0.11, 0.28
Tasks: 124 total, 1 running, 123 sleeping, 0 stopped, 0 zombie
Cpu(s): 0.2% us, 0.1% sy, 0.0% ni, 66.6% id, 33.1% wa, 0.0% hi, 0.0% si
Mem: 12299332k total, 2569836k used, 9729496k free, 61288k buffers
Swap: 20972816k total, 0k used, 20972816k free, 2274852k cached

PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
6345 oracle 16 0 37132 1752 1172 S 0.0 0.0 0:00.08 sshd
6346 oracle 16 0 54004 1536 1208 S 0.0 0.0 0:00.02 bash
6423 oracle 16 0 45376 10m 6228 S 0.0 0.1 0:00.25 tnslsnr
6471 oracle 16 0 740m 17m 13m S 0.0 0.1 0:00.02 oracle
6473 oracle 16 0 739m 15m 12m S 0.0 0.1 0:00.01 oracle
6475 oracle 16 0 739m 32m 29m S 0.0 0.3 0:00.07 oracle
6477 oracle 16 0 742m 50m 44m S 0.0 0.4 0:00.27 oracle
6479 oracle 16 0 754m 23m 19m S 0.0 0.2 0:00.43 oracle
6481 oracle 16 0 739m 24m 20m S 0.0 0.2 0:00.61 oracle
6483 oracle 16 0 740m 88m 83m S 0.0 0.7 0:00.71 oracle
6485 oracle 16 0 739m 22m 19m S 0.0 0.2 0:00.01 oracle
6487 oracle 16 0 740m 30m 25m S 0.0 0.3 0:00.15 oracle
6489 oracle 16 0 741m 55m 48m S 0.0 0.5 0:00.29 oracle
6491 oracle 16 0 739m 24m 20m S 0.0 0.2 0:00.01 oracle
6493 oracle 16 0 739m 15m 11m S 0.0 0.1 0:00.01 oracle
6495 oracle 16 0 739m 14m 11m S 0.0 0.1 0:00.00 oracle
6622 oracle 16 0 739m 16m 13m S 0.0 0.1 0:00.00 oracle
6626 oracle 16 0 740m 79m 74m S 0.0 0.7 0:01.95 oracle
6636 oracle 16 0 740m 28m 23m S 0.0 0.2 0:00.06 oracle
6638 oracle 16 0 739m 16m 12m S 0.0 0.1 0:00.01 oracle
6846 oracle 16 0 739m 19m 16m S 0.0 0.2 0:00.02 oracle
6848 oracle 16 0 739m 24m 21m S 0.0 0.2 0:00.04 oracle
6850 oracle 16 0 739m 19m 16m S 0.0 0.2 0:00.02 oracle
6852 oracle 16 0 739m 19m 16m S 0.0 0.2 0:00.01 oracle
6854 oracle 16 0 739m 30m 26m S 0.0 0.3 0:00.12 oracle
6856 oracle 15 0 739m 28m 24m S 0.0 0.2 0:00.18 oracle
6858 oracle 15 0 740m 40m 35m S 0.0 0.3 0:06.39 oracle
6862 oracle 16 0 739m 32m 28m S 0.0 0.3 0:02.25 oracle
6864 oracle 16 0 739m 19m 16m S 0.0 0.2 0:00.02 oracle
6866 oracle 16 0 739m 19m 16m S 0.0 0.2 0:00.03 oracle
6868 oracle 16 0 739m 19m 16m S 0.0 0.2 0:00.02 oracle
7480 oracle 15 0 37264 1668 1092 S 0.0 0.0 0:00.15 sshd
7481 oracle 15 0 54004 1528 1196 S 0.0 0.0 0:00.05 bash
10333 oracle 16 0 739m 20m 16m S 0.0 0.2 0:00.00 oracle
10337 oracle 15 0 6168 1080 768 R 0.0 0.0 0:00.00 top

Total RAM as seen from top command is 12G.
2569836 - Total RAM which is being used currently . 

How can I see the total RAM used by all Oracle Processes running in this 
server. The server is Linux X86 64 Bit. Can I sum up the values under 
'VIRT' column of 'top' command to see the total RAM used ?

Is there a way to see the total *RAM and CPU u*sed by Oracle from top ?
'VIRT' is the virtual memory - In what way is this related to the figure 
above, which is the physical memory (RAM) ?

Thanks in Advance
SSN

Thank You,

Kind Regards,
Sreejith Nair






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