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My my.cnf file has three sections (mysqld, mysqld_safe, mysql).  It seems that they represent different modes which MySQL runs in.  Is this correct?  I read that some recommend running in safe mode.  Should I be if it is being used to support PHP?  I typically start MySQL as "service mysqld start" when running Centos. How should I be starting it if I want it in safe mode.
 

They are not really modes. The options in the configuration file are divide into various groups. Each of mysql's programs has a set of groups it will look at for options.

 

mysqld is the actual executable for the mysql server. [mysqld] is it's unique group.

mysqld_safe is a wrapper script that adds a little bit of extra safety by restarting the server if it crashes and some error logging. It will look at the [mysqld_safe] group for it's options.

mysql refers to the mysql client application, not the server. It will look for options in the [mysql] group.

 

If you installed mysql using your system's package manager, it's probably already setup the service to start using whatever method is appropriate. I wouldn't worry about ensuring it uses mysqld_safe vs mysqld. All you need to look into is configuring mysql's options (ie memory limits, connections, etc.) so that it runs well for your environment

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Thanks Kicken,

 

I haven't been able to find any documentation explaining the "big picture" behinds the my.cnf file.  Yes, there is documentation about the individual settings, but I haven't seen anything describing these "groups and options".

 

Could you point me in a good direction to read up on them?

 

Thank you

Thanks QuickOldCar,

 

Wasn't really looking to optimize my.cnf, but just better understand how it is organized.

 

I would have expected http://dev.mysql.com/doc/refman/5.5/en/option-files.html to describe it, but it doesn't really do so.

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