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Database are applications which store information in tables. Most of the modern applications and content management systems like wordpress, drupal , blogs and forums. The most popular web database applications are Mysql, oracle and Microsoft's SQL server. Mysql is most inexpensive and reliable option. Database applications are heavy on server. They limit the performance of servers. Webhosting companies take extra care in giving access to mysql access. Many free web hosts provide mysql but most of the time their service is unreliable due to bad performace of servers. Most of the time the cause is due to heavily abused Mysql. Due to these performance issues, mysql and webserver (like apache or Microsoft server ) are installed on seperate box or machines for scalability and performance. Website with very huge traffice use Microsoft sql server or oracle which are generally robust.