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When I do "top", I only see that mysqld is using 70% of Memory. Nothing else.

Why is it being used up?

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need more info here chief, maybe some details on whats running or mysql config? –  Jakub Dec 16 '09 at 21:58

3 Answers 3

Linux takes advantage of all the memory available to it.

If there is memory that is not being specifically used by applications, the OS will use it for cacheing to speed up other processes.

No use letting useful resources sit there unused :)

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+1 - RAM that is un-utilised (esp. in a server) is going to waste –  Mark Henderson Dec 16 '09 at 20:54
    
Funny how everybody is complaining about Windows doing the same. –  grawity Dec 17 '09 at 15:56

Mysql (and any other SGBD) are trying to load the most data possible in memory because it is some much quicker to get data from RAM than an hard drive.

This is a normal behavior on Linux (probably most unix, and maybe windows ?) systems behave like this. The more you have in memory, quicker the software runs.

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SGBD == DBMS, just in case anyone (like me) was wondering - save you googling it :) –  Mark Henderson Dec 17 '09 at 1:29
    
Yes, sorry.. SGBD is, at least, the french one.. My bad.. –  Vincent Demeester Dec 17 '09 at 7:32

Use "free -m" to get a clearer picture of what your memory is being used for.

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