MySQL General Architecture

MySQL operates in a networked environment using a client/server architecture. In other words, a central program acts as a server, and various client programs connect to the server to make requests. A MySQL installation has the following major components: MySQL Server, Client programs and MySQL non client utilities.

MySQL Server

MySQL Server, or mysqld, is the database server program. The server manages access to the actual database (schema) on disk and in memory. MySQL Server is multi-threaded and supports many simultaneous client connections. Clients can connect via several connection protocols. For managing database contents, the MySQL server features a modular architecture that supports multiple storage engines that handle different types of tables (for example, it supports both transactional and non-transactional tables).

Keep in mind the difference between a server and a host. The server is software (the MySQL server program mysqld). Server characteristics include its version number, whether certain features are included or excluded, and so forth. The host is the physical machine on which the server program runs. Host characteristics include its hardware configuration, the operating system running on the machine, its network addresses, and so forth.

Client Programs

These are programs that are used for communicating with the server to manipulate the databases that are managed by the server. MySQL AB provides several client programs. The following list describes a few of them:

MySQL Query Browser and MySQL Administrator are graphical interfaces to the server.

mysql is a command-line program that acts as a text-based front end for the server. It's used for issuing queries and viewing the results interactively from a terminal window.

Other command-line clients include mysql import for importing data files, mysqldump for making backups, mysql admin for server administration, and mysqlcheck for checking the integrity of the database files.

MySQL Client/Server Model

MySQL runs on many varieties of Windows, Unix, and Linux, but client/server communication is not limited to environments where all computers run the same operating system. Client programs can connect to a server running on the same host or a different host, and the client and server host need not have the same operating system. For example, client programs can be used on Windows to connect to a server that is running on Linux. Most of the concepts discussed here apply universally to any system on which MySQL runs. Platformspecific

information is so indicated. Unless otherwise specified, “Unix” as used here includes Linux and

other Unix-like operating systems.

PHP INTRODUCTION

PHP (recursive acronym for PHP: Hypertext Preprocessor ) is a widely-used open source general-purpose scripting language that is especially suited for web development and can be embedded into HTML. PHP stands for P HP: H ypertext P reprocessor PHP is a server-side scripting language, like ASP PHP scripts are executed on the server PHP supports many databases (MySQL, Informix, Oracle, Sybase, Solid, PostgreSQL, Generic ODBC, etc.) PHP is an open source software PHP is free to download and use Why PHP? PHP runs on different platforms (Windows, Linux, Unix, etc.) PHP is compatible with almost all servers used today (Apache, IIS, etc.) PHP is FREE to download from the official PHP resource: www.php.net PHP is easy to learn and runs efficiently on the server side What can PHP do? Anything. PHP is mainly focused on server-side scripting, so you can...

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PHP was originally designed to be used in conjunction with a web server, and in the case of the LAMP architecture, the Apache Web Server. PHP applications are designed embedding PHP scripts within a web page along with its HTML. Unlike standard HTML pages which are sent directly from the web server to the end user, PHP files are first interpreted by the PHP application which then converts the PHP script into another form for display. This process eliminates the end user from being able to see the original PHP script that was embedded in the HTML and provides true interaction in HTML files. This process is similar to proprietary applications such as ASP and Coldfusion; however, PHP is Open Source and cross- platform. PHP Tags PHP scripts are distinguished from the HTML scripts by using delimiting characters ...

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