Guide to database servers

Solutions:the most important SQL-based

 * MySQL - best for fast query-based systems
 * PostgreSQL
 * Firebird
 * Ingres - more for transaction based systems

Solutions:lite included SQL-based

 * adodb - abstraction database for litesql, mysql and tens of other databases....
 * SQLite

Solutions:XML based or related

 * eXist

Solutions:true relational

 * dbappbuilder