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A database is a collection of information, usually in the digital form that is organized so that it can easily be accessed, managed, and updated. A database can be thought of as an electronic filing system. Oracle and SQL Server are popular commercial relational databases. MySQL is a very popular open source relational database.
Aggregations of data records or files, such as sales transactions, product catalogs and inventories, and customer profiles are typically contained in computer databases. Typically, a database manager provides users the capabilities of controlling read/write access, specifying report generation, and analyzing usage.
A relational database represents a collection of records, each of which contains one or more fields (i.e., pieces of data) about some entity (i.e., object), such as a person, work of art, recipe, chemical, or sequence of DNA.
Some of the most widely used types of databases are:
- Active Database – It is a database that includes an event-driven architecture (often in the form of ECA rules) which can respond to conditions both inside and outside the database. Security monitoring, alerting, authorization is some of its uses.
- Data Warehouse – It is used for reporting. The data stored in the warehouse is uploaded from the operational systems. The data may pass through an operational data store for additional operations before it is used in the DW for reporting.
- Graph Database – A graph database is a kind of NoSQL database that uses graph structures with nodes, edges, and properties to represent and store information. General graph databases that can store any graph are distinct from specialized graph databases such as triplestores and network databases.
- Operational Database – These databases store detailed data about the operations of an organization. They are used by almost all the organizations in the world. They are typically organized by subject matter, process relatively high volumes of updates using transactions.
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You can find more valuable information about Relational Database Management Systems (RDBMS and DBMS).