hi, may I know what is the main function of the MySQL database in the CMS server and what information does it store?
It's a database server. It stores all the data the CMS gathers from you (eg your layouts - except your file-based media items -, users and permissions, authentication etc).
The CMS can't function without it.
Hi Alex, thanks for your response. Is there a need to install the mysql database server on a separate server protected by a firewall for security purpose?
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Typically you'd have the database on the same server as the CMS, but it can be remote if you wish. You'd typically only separate it if you needed additional performance.