Magento Commerce is very robust system which make me happy with its complexness, but on the other hand this robustness implied bad performance. There are few but reliable tips for Magento Performance Enhancements before you should upgrade your server. You can tune Apache web server, PHP engine configuration and modules, MySQL server configuration, and at last you have to setup Magneto to use this tunes.
This Post is step by step generic tutorial how to install Magento Commerce.
First of all you should setup your Environment, but if you are installing Magento first time you should check if you fit Magento Commerce System Requirements. In short you need: any os running Apache, PHP, and MySQL. Required PHP modules are: PDO_MySQL, Simplexml, mcrypt, hash, GD, DOM, iconv, SOAP (optional).
If you have to migrate Magento database from one server to another, or from your local working station to server (etc.), you sure noticed that Magento store informations about base urls in database, so you have to change this data. To fix this you need migrate the database to new server, and then through PHPMyAdmin, or mysql console submit this commands to change new base url and base secure url.
Its quite simple. You just have to edit your local configuration file app/etc/local.xml too look like this:
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<config>
<global>
<cache>
<prefix>apc</prefix>
<!-- this prefix should be unique for each Magento using this server -->
<backend>apc</backend>
</cache>
<!-- ... another content of your local.xml -->
</global>
</config>
