memory shared issue - please comment

as a newbie, i am not quite sure whether memory shared is important, but from almost all the posts regarding memory, there are memory shared usage, but my server isn't using any memory shared. is this normal/ok?

according to top :

133 processes: 132 sleeping, 1 running, 0 zombie, 0 stopped
CPU states: 1.7% user, 0.9% system, 0.0% nice, 97.2% idle
Mem: 497240K av, 332204K used, 165036K free, 0K shrd, 7400K buff
Swap: 530104K av, 0K used, 530104K free 231752K cached

according to cat /proc/meminfo :

total: used: free: shared: buffers: cached:
Mem: 509173760 347185152 161988608 0 7581696 237514752
Swap: 542826496 0 542826496
MemTotal: 497240 kB
MemFree: 158192 kB
MemShared: 0 kB
Buffers: 7404 kB
Cached: 231948 kB
Active: ****80 kB
Inact_dirty: 105272 kB
Inact_clean: 0 kB
Inact_target: 5244 kB
HighTotal: 0 kB
HighFree: 0 kB
LowTotal: 497240 kB
LowFree: 158192 kB
SwapTotal: 530104 kB
SwapFree: 530104 kB

or is the memory shared disable? how can i enable it? help please

 

 

 

 

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