What is a database or database management system DBMS?

Basically a simple computer file or card index containing related data is a database. In such a system the items data will be laid out as a table with related data items forming a row (called a 'tuple') Place , measurement 1, measurement 2, measurement 3 site1, 10, 5, 9 site2, 15, 17, 3 site3, 4, 7, 16 would be an example of such a simple database table/file If you have more than one type of information from site 1, 2, 3 etc then you would logically put these into separate files/tables but you may then want to link them together to do use the information as a whole A database is a set of tables containing data where there are connections between the data stored in one table and data stored in other tables A Database Management System (DBMS) is a computer application capable of storing a database and linking the information in the tables together to form new tables A true DBMS should implement a set of mathematical rules (called relational calculus), defining a relational model for databases, which if implemented by the application properly will guarantee that queries asked about the data comprising the database yield valid results It should be noted that the relational model is currently the only model for a DBMS with a mathematical proof that it will work. There are alternate database management systems offered for sale that do NOT implement the relational model and therefore when used may not return valid results - (would you want to trust your business to them?).

A database management system is a series of programs used to create and maintain a database. Oracle and Sybase are names of database management systems.

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