db4o Developer Community

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• Benchmark
• BTree
• Contributing
• Development
• Harmony
• I/O
• Java
• Lazy Queries
• Memory
• Modularity
• Paircast
• Poleposition
• Query
• TypeHandler

• Continous Performance Integration Testing

  Performance matters! Whenever we do a user survey, performance gets the most votes as the single most important point to improve db4o. As a first step for our 2008 performance initiative ( probably going to be dubbed "TenX" ) we have integrated continous Read More... Posted Thursday, February 07, 2008 1:56 AM by Carl Rosenberger | 2 Comments Filed under: Performance, Poleposition, Paircast

• New TypeHandler interface: Prerequisite for more extensibility and performance

  One of the key advantages of db4o is that it simply stores any object with just one line of code: objectContainer.store(myObject); ...but how ? In the past the magic to make this possible was hidden deep down in db4o core. The TypeHandler4 interface in Read More... Posted Saturday, February 02, 2008 8:22 PM by Carl Rosenberger | 2 Comments Filed under: Performance, TypeHandler, Contributing, Modularity

• I/O Benchmarking and Simulation of Slower I/O Behaviour

  I/O access times play a crucial role in the overall performance of a database. That is why we introduce two tools to measure the actual I/O performance of a system as seen by db4o simulate the behaviour of a slower system on a faster one All the code Read More... Posted Saturday, January 26, 2008 12:53 AM by czimmerli | 2 Comments Filed under: Java, Development, Performance, Benchmark, I/O

• Lazy Queries

  How do you write a fast program? Easy: It should only do what is absolutely necessary with the smallest number of steps possible. Isn't that ultimate laziness? Lazy == Fast ! With this idea in mind we were looking for ways to do less work in our query Read More... Posted Friday, November 10, 2006 8:59 AM by Carl Rosenberger | 11 Comments Filed under: Query, Performance, Lazy Queries

• db4o runs successfully on Apache Harmony!

  I tried to make db4o run on Apache Harmony[1], which is an open source J2SE implementation under Apache License V2. After 2 days struggling, fixing some bugs in Harmony, db4o runs successfully on Apache Harmony now! All the test cases (except sun jre Read More... Posted Wednesday, October 11, 2006 8:39 AM by Andrew Zhang | 1 Comments Filed under: Java, Performance, Harmony

• New BTree Field Index Processor

  Wooohooo! Our new BTree Field Index Query Processor is now available from our SVN for testing! This big step forward will be released as "Development Build 5.7" in the coming week. We have been using the Poleposition benchmark to check our progress. The Read More... Posted Monday, September 18, 2006 2:29 AM by Carl Rosenberger | 3 Comments Filed under: Query, Development, Memory, BTree, Performance