YFOSBAPP

Database
A database is information organized in such a way that a computer program can quickly select pieces of data. You can think of it as an electronic filing system. A database is an organized collection of data. It is the collection of schemas, tables, queries, reports, views and other objects.

Data Integration
Data integration involves combining data residing in different sources and providing users with a unified view of these data. This process becomes significant in a variety of situations, which include both commercial (when two similar companies need to merge their databases) and scientific (combining research results from different bioinformatics repositories, for example) domains. Data integration appears with increasing frequency as the volume and the need to share existing data explodes. It has become the focus of extensive theoretical work, and numerous open problems remain

Existing DBMSs provide various functions that allow management of a database and its data which can be classified into four main functional groups:  Data definition – Creation, modification and removal of definitions that define the organization of the data.
 Update – Insertion, modification, and deletion of the actual data.
 Retrieval – Providing information in a form directly usable or for further processing by other applications. The retrieved data may be made available in a form basically the same as it is stored in the database or in a new form obtained by altering or combining existing data from the database.
 Administration – Registering and monitoring users, enforcing data security, monitoring performance, maintaining data integrity, dealing with concurrency control, and recovering information that has been corrupted by some event such as an unexpected system failure.

Types of Database
 Operational Databases -