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a)How do you monitor Unix system?
With monitoring tools, or adequate unix commands: top, sar, iostat, vmstat etc...
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(b)How do you know every thing is working fine?
? By looking at the logs?
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(c)How do you know if there are any bottle necks?
by monitoring the system...
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(d)How do you know if any process is hanging and draining the resources?
top ?
I let others continue and complete!
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(e)If the application is driven by exchange feeds, how do you know if the feeds are all set up correctly?
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(f)Are you aware of any performance monitoring tools?
---------- Post updated at 16:30 ---------- Previous update was at 16:27 ----------
About performance monitoring tools, plenty exist from free to $$$$$ all depends on what you are looking for and how much $$$/time you can spare