1. MySQL

For a web based use MySQL is the top choice, as it is the most often the only DBMS available in virtual hosting accounts. It runs on several platforms. It allows users to download the server and client software as well as a MySQL ODBC diver and a bunch of other MySQL tools from this page. MySQL is simpler and smaller, and therefore generally faster than other databases servers.


2. PostgreSQL

PostgreSQL is an Open Source server-based database management system that runs well on UNIX based systems such as Linux. It is
much more robust, scalable, and standards compliant than MySQL, and it can handle multiple transactions easily. However, the Postgres Plus Standard Server supports the most popular environments, including Linux 32, Linux 64, Windows, and Mac OS X.


3. Firebird

This is an Open Source relational database offering many ANSI SQL-92 features that runs on Linux, Windows, and several Unix platforms. It features high SQL compliance, stored procedure and other advanced database features.


4. GNU SQL Server

SQL Server is a free portable multi-user relational database management system. GNU SQL Server supports the SQL89 dialect and some extensions from SQL92. It offers multiuser access and transaction based on predictive locks. The database system runs smoothly in UNIX OS and its working language is based on C.  Moreover, it also uses RPC, shared memory and message queues.


5. SAP MaxDB

It is one of the popular open source database management system developed and supported by SAP AG. It runs on Microsoft Windows, Linux and Unix, and for the other prominent hardware platforms. For those organizations undergoing SAP implementation MaxDB ensure that your database migration goes smoothly.


6. ScimoreDB

It is a free distributed RDBMS designed for high load OLTP and Terabyte OLAP warehouses. The server is build to take advantage of parallelization over multiple servers. It helps to achieve a near linear scalability for OLTP applications. It can support up to 512 PC’s in a single database cluster.


7. DXstore database system

This is a database management system designed for Linux, FreeBSD, and other operating systems. The database system is distributed in embeddable C or C++ library and shares with them the model of a database as a collection of key/value pairs. It has an entirely new design and implementation. Moreover its functionality has been extended.


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