How to find memory taken by Oracle processes using top command

I wanted to know how to find the memory taken by Oracle processes using top command. The output of the top command is as follows as an example:
Mem: 16436072k total, 16215708k used, 220364k free, 395128k buffers
Swap: 25165816k total, 1168288k used, 23997528k free, 13366520k cached
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
27281 oraprod 15 0 6705m 1.3g 1.3g S 0.0 8.6 61:44.71 oracle
27383 oraprod 15 0 6702m 1.2g 1.2g S 0.0 7.7 2:22.75 oracle
5199 oraprod 16 0 6745m 1.1g 1.0g S 0.0 6.8 2:51.23 oracle
The different Oracle processes could be Oracle database, Oracle listener, Oracle enterprise manager etc.
I hope, my question is clear as to how to find the memory taken by a process using top command.
Please revert with the reply to my query.
Regards

a short and correct answer would be: you can't.
As oracle uses a fair amount of shared memory, and that shared memory is attached to most of the oracle processes, the same memory appears a number of times.
you should rephrase your question / what is it you want to achieve?
you can ask oracle how much memory is assigned to it, v$sga, v$sgastat, v$process (for PGA). moreover, you as DBA are the one who configured that.
you can look at major an minor faults per process to see what is causing the paging (if you have any).
you can also look at the /proc/pid/statm pseudofilesystem for your oracle pids.

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How to find memory taken by a process using top command

I wanted to know how to find the memory taken by a process using top command. The output of the top command is as follows as an example:
Mem: 13333364k total, 13238904k used, 94460k free, 623640k buffers
Swap: 25165816k total, 112k used, 25165704k free, 4572904k cached
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
16514 applmgr 25 0 2197m 1.7g 10m S 0.3 13.0 15:20.67 java
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30431 crestelo 25 0 2043m 1.4g 161m S 50.9 11.0 79:02.73 java
30869 crestelo 25 0 2860m 1.2g 9292 S 0.0 9.6 7:11.18 java
16655 applmgr 23 0 1934m 1.1g 10m S 0.3 8.9 2:17.49 java
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I hope, my question is clear as to how to find the memory taken by a process using top command.
Please revert with the reply to my query.
Regards

Have you tried "man top" to see the documentation for the top command?
How about the following: http://lmgtfy.com/?q=show+memory+with+top+command
The 5th column (VIRT) shows the amount of RAM + swap
The 6th column (RES) shows RAM
The 7th column (SHR) shows memory shared between processes

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APPLSYS.FND_CONC_PROG_ANNOTATIONS 272 0 0
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AZ.AZ_SELECTION_SET_ENTITIES_B 48 0 0
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AZ.AZ_SELECTION_SET_ENTITIES_B|FILTERING_PARAMETE 48 0 0
ECX.ECX_DTDS|PAYLOAD 205 0 0
ECX.ECX_FILES|PAYLOAD 91 0 0
IBC.IBC_ATTRIBUTE_BUNDLES|ATTRIBUTE_BUNDLE_DATA 41 0 0
JTF.JTF_HEADER_DTD|HEADER_DTD 1 0 0
JTF.JTF_MESSAGE_OBJECTS|BUS_OBJ_DTD 41 0 0
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JTF.JTY_TRANS_USG_PGM_SQL|BATCH_DEA_SQL 1 0 0
JTF.JTY_TRANS_USG_PGM_SQL|BATCH_INCR_SQL 5 0 0
JTF.JTY_TRANS_USG_PGM_SQL|BATCH_TOTAL_SQL 6 0 0
JTF.JTY_TRANS_USG_PGM_SQL|INCR_REASSIGN_SQL 5 0 0
JTF.JTY_TRANS_USG_PGM_SQL|REAL_TIME_INSERT 6 0 0
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OKC.OKC_REPORT_SQL_TL|HELP_TEXT 2 0 0
OKC.OKC_REPORT_XSL_TL|HELP_TEXT 2 0 0
OKC.OKC_REPORT_XSL_TL|XSL_TEXT 3 0 0
XDP.XDP_PROC_BODY|PROC_BODY 10 0 0
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