Database is an organized collection of data for one or more multiple uses. One way of classifying databases involves the type of content, for example: bibliographic, full-text, numeric, image. Other classification methods start from examining database models or database architectures: see below. Software organizes the data in a database according to a database model. As of 2010[update] the relational model occurs most commonly. Other models such as the hierarchical model and the network model use a more explicit representation of relationships.

Contents
Architecture
Database management systems
Types
Models
Storage Structures
Indexing
Transactions and concurrency
Replication
Security
Locking
Applications
Databases in new media

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