Memory used by oracle

[Kory V. Wheatley]

What does "top" show?  Would "free" command be more accurate?
Yong Huang wrote:
>> [root at abcserver ~]# free -m
>>              total       used       free     shared    buffers     cached
>> Mem:          8988       8906         82          0        102       5411
>> -/+ buffers/cache:       3392       5596
>> Swap:         3999       1577       2422
>>     
> ...
>   
>> ... from the free
>> command I get that the system is using around 5Gb (Mem used - Mem cached +
>> swap used). What am I doing wrong in here?
>>     
>
> 8906-3392+1577 = 7091 MB. Where did you get 5GB?
>
> Yong Huang
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