Tham khảo tài liệu 'tự học html và css trong 1 giờ - part 70', công nghệ thông tin, đồ họa - thiết kế - flash phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 666 lesson 22 Content Management Systems and Publishing Platforms The most common relational database offered by web hosting providers is MySQL an open source database that s freely available. There are many other popular relational databases too including Oracle Microsoft SQL Server and PostgreSQL another free database . For web applications however MySQL is the leader. All the applications I m going to discuss in particular work with MySQL. If you want to read more about it the manual is available online at http doc . Deploying Applications All the applications discussed in this lesson run on a web server. When it comes to hosted applications you don t need to worry about the web server. That s the job of the application provider. In cases where you are installing your own applications it s up to you to make sure your web server environment will work with your application. For example all the applications I m going to discuss in detail are written in PHP. If you are planning on deploying to a server running Microsoft Internet Information Services without PHP support you won t get these applications to run. Before you download and attempt to install an application check its requirements to make sure the server on which you plan to deploy the application meets them. If you lease server space from a web hosting provider you may need to check with it before installing your software to make sure it s compatible with their environment. For example in addition to big requirements such as PHP or MySQL some software packages also require particular libraries or supplemental software packages to function properly. You might need to ask to find out whether your hosting provider has all the software you need running in its environment. In some cases a hosting provider will actually install the software you need if you explain what you re trying to do. There s another issue you might run into depending on what kind of access you have to your server. Generally .