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mysql version 5 maximum memory on linux 64 bit

Posted on 2010-11-23
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Last Modified: 2012-05-10
Hi

Are there any upper limits on how much memory mysqlcan use on 64 bit linux. I want to give it as much as possible!

Thanks
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Question by:andieje
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Expert Comment

by:wolfgang_93
ID: 34200877
Should you use the InnoDB engine for your tables -- a highly recommended
feature to ensure ACID compliance, robustness etc. -- you will want to set certain
configuration parameters in your my.cnf file to take advantage of the high speed
RAM memory which is 1000 times faster than disk -- to achieve a high hit-cache
ratio.

A rule of thumb I use is to take amount of RAM for the server, subtract 1
gig for operating system, subtract 1 or 2 gig for other stuff in MySQL and
other applications on the server. So if RAM is 8 gig, I would make sure
to have a line like this in my my.cnf config file:

#
# Set buffer pool size to 50-80% of your computer's memory
innodb_buffer_pool_size=5G

There of course other config parameters that could be bumped up to get
better performance, but this is by far the most significant one for tables
set up for InnoDB.

After changing any config parameters in my.cnf file, you should reboot
the server to ensure the changes are applied.
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Author Comment

by:andieje
ID: 34201333
so there isn;t an upper limit then?
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Accepted Solution

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wolfgang_93 earned 500 total points
ID: 34201377
There was an upper limit for 32 bit of 2 gig or so because of the limitations of
32 bit. For 64 bit, the memory limit is not an issue. Use as much as is available
on the server and that makes sense in the context of what you are running
on the server.
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Author Closing Comment

by:andieje
ID: 34201396
thanks a lot
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