Berkeley DB Java Edition

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Berkeley DB Java Edition is a high performance, transactional storage engine written entirely in Java.

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Berkeley DB Java Edition is a high performance, transactional storage engine written entirely in Java. Like the highly successful Berkeley DB product, Berkeley DB Java Edition executes in the address space of the application, without the overhead of client/server communication. Berkeley DB Java Edition stores data in the application's native format, so no runtime data translation is required.

Berkeley DB Java Edition supports full ACID transactions and recovery. It provides an easy-to-use, programmatic interface, allowing developers to store and retrieve information quickly, simply and reliably.

Berkeley DB Java Edition is designed to offer the same benefits of Enterprise Java Beans 3.0 (EJB3) persistence without the need to translate objects into tables.

Relational databases are the most sophisticated tool available to the developer for data storage and analysis. Most persisted object data is never analyzed using ad-hoc SQL queries; it is usually simply retrieved and reconstituted as Java objects. The overhead of using a sophisticated analytical storage engine is wasted on this basic task of object retrieval. The full analytical power of the relational model is not required to efficiently persist Java objects. In many cases, it is unnecessary overhead. In contrast, Berkeley DB Java Edition does not have the overhead of an ad-hoc query language like SQL, and so does not incur this penalty.

The result is faster storage, lower CPU and memory requirements, and a more efficient development process. Despite the lack of an ad-hoc query language, Berkeley DB Java Edition can access Java objects in an ad-hoc manner, and it does provide transactional data storage and indexed retrieval, as you would expect from any database. The difference is that it does this in a small, efficient, and easy-to-manage package. Using the Direct Persistence Layer (DPL), Java developers can quickly and easily persist and retrieve inter-related groups of Java objects with confidence, speed, and a fraction of the complexity and overhead of a comparable ORM solution.

Berkeley DB Java Edition was designed from the ground up in Java. It takes full advantage of the Java environment. The API provides a Java Collections-style interface, as well as a programmatic interface similar to the Berkeley DB API. The architecture of Berkeley DB Java Edition supports high performance and concurrency for both read-intensive and write-intensive workloads.

Berkeley DB Java Edition is different from all other Java databases available today. Berkeley DB Java Edition is not a relational engine built in Java. It is a Berkeley DB-style embedded store, with an interface designed for programmers, not DBAs. The architecture is based on a log-based, no-overwrite storage system, enabling high concurrency and speed while providing ACID transactions and record-level locking. Berkeley DB Java Edition efficiently caches most commonly used data in memory, without exceeding application-specified limits. In this way Berkeley DB Java Edition works with an application to use available JVM resources while providing access to very large data sets.

J2EE is a central part of many enterprise deployments of Java. Berkeley DB Java Edition fits into the J2EE architecture by implementing three key APIs within J2EE. At its core, Berkeley DB Java Edition is a transactional database. Within a J2EE application server, many different subsystems must coordinate and work together in a transactional manner. By implementing the Java Transaction API (JTA), Berkeley DB Java Edition functions as a managed transactional resource within the application server. Berkeley DB Java Edition also implements the J2EE Connector Architecture (JCA) to ease integration into application servers.

Finally, once integrated and performing transactional operations, most applications will require some ability to manage a service. Berkeley DB Java Edition exports information and services using the Java Management Extensions (JMX). In concert JTA, JCA and JMX allow Berkeley DB Java Edition to operate to its fullest and in a predictable manner in J2EE-based solutions.
Berkeley DB Java Edition provides robust storage services for any Java application requiring high performance, transactional integrity and recoverability.
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Last updated on January 13th, 2011

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