db4o Developer Community

db4o open source object database, native to Java and .NET

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Welcome to the world's largest user community for object database technology!

Learn, contribute, and enjoy your exchange with more than 50,000 registered peers, who want to bring object oriented programming to the next level - the database - and leave the era of the object-relational mismatch, tedious O/R mappers and roll-your-own-databases behind them! Join the developer community now - it's fast, easy, and free.

In the Community

		Tips on indexing and query optim...
		This blog post shows some indexing basics and performance tips by Arne Claassen . Among other things Arne shows you which assemblies to include to make sure your native queries can be optimized. Thanks Arne!...

db4o Projects Spotlight

	Freenet project chooses db4o
	Freenet is free software which lets you publish and obtain information on the Internet without fear of censorship. To achieve this freedom, the network is entirely decentralized and publishers and consumers of information are anonymous. For db4o specific source code check the site on Google code

Product News

7.4 - Release Notes

Now is the time for the newer and better Stable version - 7.4 . As usual it is available in download center and recommended for …

New db4o library structure in db4o 7.7

The db4o core engine used to get built to one big fat .jar/.dll. From our users on low resource devices we constantly hear …

Changes in Db4o Configuration API

Hi. Recently we introduced some changes to our configuration APIs striving for simplicity. You can read more about these changes …

Fast Reflection for .Net

Hi, Recently we decided to evaluate how much impact (in performance) reflection represented in db4o. In .Net side we already knew …

Committed callbacks, pushed updates and read committed isolation revisited

Some time ago we presented Pushed Updates as a sample application for Committed Callbacks in this blog . Recently we put a similar …

Recent Activity

[Kudos] If you want objects, use db4o

I am looking for various embedded databases. Each database has good and bad sides. I even tried JDBM (ripped off from W3C Jigsaw and bit fixed inside - it is just few classes). All I need is very fast and embeddable engine (means, very small at footprint...

[Kudos] db4o seems like an ideal local, que...

I'm pretty happy with simplicity and performance of db4o so far. It seems like an ideal local, queryable persistence layer. The way it works does want to make me abstract my data model into simple data objects that are then converted into business entities....

Tips on indexing and query optimization

This blog post shows some indexing basics and performance tips by Arne Claassen . Among other things Arne shows you which assemblies to include to make sure your native queries can be optimized. Thanks Arne!...

db4o v7.4 working on Mono

Arne Claassen has been playing with db4o under Mono and came up with a DLL for db4o v7.4 that works beautifully across .NET and Mono from a single build. See his blog post here ....

[Kudos] db4o turned out pretty quick and si...

"I had wide number of choices how to implement the persistence - using a file, a regular sql database, embedded database like HSQLDB or H2. I really wanted something simple, no extra server administration, table creation or O/R mapping definition. I wanted...