object database


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object database

A database that is managed by an object-oriented database management system (ODBMS). Object databases are closely aligned with a particular object-oriented programming language and enable the data in the objects to be persistently stored without requiring conversion to a relational database (see O-R mapping). A fair amount of tedious code is eliminated, and the object data are stored much faster.

Complex Structures
Object databases are also suited for applications that are not necessarily based on an object model, but use a large number of in-memory indexes that are difficult to store in a relational database. Object databases may be used for real-time applications whereby they can extend memory beyond the operating system's own virtual memory limit.

Object Vs. Relational
Examples of object-oriented databases are ObjectStore (www.ignitetech.com) and Versant Object Database (www.versant.com). Relational databases have also added object-oriented features; for example, UniSQL was one of the first products to support both structures. See universal server, ODMG and object-oriented programming.


Structural Flexibility
While relational databases easily provide one-to-many and many-to-one relationships, object databases allow for many-to-many relationships. Information systems that require complex relationships can store their data in an object database with greater ease than a relational database.







Object Modeling
When information systems are modeled as objects, they can employ the powerful inheritance capability. Instead of building a table of employees with department and job information in separate tables, the type of employee is modeled. The employee class contains the data and the processing for all employees. Each subclass (manager, secretary, etc.) contains the data and processing unique to that person's job. Changes can be made globally or individually by modifying the class in question.
References in periodicals archive ?
com) provides db4o, the world's most popular object database, native to Java and .
ORG provides software developers and others with resources focusing on object database technology and the integration of object-oriented programming and databases," said Leon Guzenda, chief technology officer at Objectivity, Inc.
With more than 250,000 downloads and nearly 10,000 registered users in just one year since its open source launch, db4o has achieved one of the most successful product introductions of any object database in history.
The competitive upgrade program includes a free assessment to determine the scope of the migration project, as well as customized professional services offerings to rapidly convert applications from other object database products.
Its products enable corporate data caching and complex event processing, and its leading object database is renowned for performance and scalability.
is the leading provider of high performance object databases that manage and analyze complex information and relationships as well as very large volumes of data for mission-critical, real-time applications.
This distribution agreement extends the reach of Objectivity's federated object database into Canadian government projects focused on disparate data systems, security, surveillance and military data mining applications.