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Android-Ready, Object-Oriented Perst Embedded Database Brings Rich Development Tools to Google’s Mobile Platform

January 2, 2008 — McObject® announced that Perst™, its all-Java object-oriented, open source embedded database, has been verified as compatible with the Android mobile device platform backed by Google (NASDAQ:GOOG) and the Open Handset Alliance.

McObject is offering the Android-ready Perst, as well as TestIndex, a demo application showing Perst and Android’s bundled SQLite database performing the same tasks side by side. Both are available as free downloads, with complete source code, from

With Perst, users of Android-based phones will benefit from responsive, richly-featured embedded software made possible by a database system that delivers high performance and a small footprint, and by the efficiency that results from true Java developer-oriented features.

Perst stores data directly in Java objects. This eliminates the need for data-packing or unpacking code to map between the application’s data model and the database’s data model, as is required by relational and object-relational databases. The Perst API is flexible, easy-to-use and very fast compared to alternative commercial Java OODBMSs.

Perst is a very compact embedded database, with a core consisting of only five thousand lines of code. This small footprint imposes little demand on system resources. Moreover, Perst does not require administration. Perst supports transactions with the ACID (Atomic, Consistent, Isolated and Durable) properties, and expands developers’ coding efficiency by making Java objects as easy to use as possible.

For example, for access to objects, Perst implements specialized collection classes optimized for different data layouts and access patterns, including: – Classic B-Tree implementation; – R-tree indexes for spatially-oriented applications such as GIS and navigation; – Main-memory database containers, based on T-Tree indexes, optimized for real-time memory-only access; – Patricia Trie index, which speeds searches in networking and telephony applications; – TimeSeries class to efficiently deal with small fixed-size objects; – Specialized versions of collections for thick indices (indices with many duplicates), and bit indices (keys with a restricted number of possible values).

In addition to its core functionality, Perst provides optional features such as garbage collection, detection of hanging references, automatic schema evolution, XML import/export utilities, master-slave replication support (with the option to run read-only queries on slave nodes), an SQL subset to filter elements of any collection, and integration with the AspectJ and JAssist AOP tools.

“Google states that the success of applications on Android will be measured by outstanding end-user experiences. Features that delight end-users increasingly involve storing, searching and retrieving complex data,” Steve Graves, McObject co-founder and CEO, said.

“The Perst database performs these tasks seamlessly by fully leveraging Java’s object-orientation – the user’s commands are performed quickly, and queries return results without waiting. With source code available for free download, Perst should be a strong candidate for any Android application that benefits from an embedded database,” Graves said.

Perst is part of McObject’s family of powerful small footprint, high performance embedded database software products. McObject’s eXtremeDB in-memory embedded database is used widely in devices including MP3 players, WiMAX base stations, digital TVs, telecom/network communications equipment and military/aerospace technology. Perst is available for both Java SE- and Java ME-based devices; CA’s Wily Technology credits Perst with delivering a shortened development cycle and a ten-fold performance improvement within its real-time Java application.


About McObject
Founded by embedded database and real-time systems experts, McObject offers proven data management technology that makes real-time systems smarter, more reliable and more cost-effective to develop and maintain. McObject counts among its customers industry leaders such as DaimlerChrysler, GigaSpaces, Siemens, Phillips, EADS, JVC, Tyco Thermal Controls, F5 Networks, CA, Motorola and Boeing. McObject, based in Issaquah, WA, is committed to providing innovative technology and first-rate services to customers and partners. The company can be reached at +1-425-888-8505, or visit

McObject is a registered trademark of McObject LLC. All other company or product names mentioned herein are trademarks or registered trademarks of their respective owners.