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 35,000 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

		New Performance Contest - help u...
		We invite you to participate in the db4o performance contest which will give away 6000 USD in prizes! Basically participants will provide patches to the db4o core that impact on performance and then these modifications will be judged by the community...

db4o Projects Spotlight

	Maven support for db4o
	This project will provide a public db4o repository for simplifying the usage of db4o inside Maven based projects. For more information see: http://projects.db4o.com/Maven

Product News

db4o-7.4 Development Release

The following Jira tasks and bugs were resolved for db4o-7.4 development release: DRS-98 - NullPointerException in replicate …

flushFileBuffers(false) and the C in ACID

The short story: Configuration.flushFileBuffers(false) is no more. If you still want to configure the behaviour that used to be …

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 …

Sharpen your Java app now: Java to C# converter released as free software

As of today, db4objects releases its Eclipse based Java to C# source code conversion tool "sharpen" as free software. sharpen is …

From Transparent Activation To Transparent Persistence

Activation has been discussed in depth (no pun intended) before . Transparent Activation is db4o's ability to defer loading an …

Recent Activity

Newsletter #43: db4o Announces its First Pe...

db4o 7.4 Development Release is available for immediate download ! A R T I C L E S db4o Announces its First Performance Contest - Win $6000 in prizes! · As part of our commitment to improving db4o's performance we're organizing this hands-on contest where...

New Performance Contest - help us make db4o...

We invite you to participate in the db4o performance contest which will give away 6000 USD in prizes! Basically participants will provide patches to the db4o core that impact on performance and then these modifications will be judged by the community...

db4o-7.4 Development Release

The following Jira tasks and bugs were resolved for db4o-7.4 development release: DRS-98 - NullPointerException in replicate method DRS-97 - Ensure dRS.NET can gracefully handle delegates in untyped fields and arrays DRS-95 - dRS.NET fails with arrays/untyped...

flushFileBuffers(false) and the C in ACID

The short story: Configuration.flushFileBuffers(false) is no more. If you still want to configure the behaviour that used to be available in db4o 6.1, you can do so by setting up IoAdapters as follows: RandomAccessFileAdapter randomAccessFileAdapter =...

Committed callbacks, pushed updates and rea...

Some time ago we presented Pushed Updates as a sample application for Committed Callbacks in this blog . Recently we put a similar mechanism in a slightly different context. Since we encountered some perceived ambiguity concerning db4o transaction semantics,...