This book constitutes the thoroughly refereed post-conferenceproceedings of the 2nd International Conference on Object Databases, ICOODB 2009, held in Zurich, Switzerland, in July 2009.The 6 revised full papers presented together with 3 invited papers werecarefully reviewed and selected from the presentations at the researchtrack during two rounds of reviewing and improvement. These papersaddress a wide range of issues related to object databases, includingtopics such as applications, methodologies, design tools, frameworks andstandards as well as core object database technologies.