Relational Database Management Systems
Relational databases, as implemented in relational database management systems, have become a predominant choice for the storage of information in new databases used for financial records, manufacturing and logistical information, personnel data and much more. Relational databases have often replaced legacy hierarchical databases and network databases because they are easier to understand and use, even though they are much less efficient. As computer power has increased, the inefficiencies of relational databases, which made them impractical in earlier times, have been outweighed by their ease of use. However, relational databases have been challenged by object databases, which were introduced in an attempt to address the object-relational impedance mismatch in relational database, and XML databases. The three leading commercial relational database vendors are Oracle, Microsoft, and IBM. The three leading open source implementations are MySQL, PostgreSQL, and SQLite. Amazon Relational Database Service is a database as a service offering MySQL and Oracle database engines.
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