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McObject Unveils Object DB for Java, C#

By Edward J. Correia

March 1, 2006 — Check out what’s on McObject’s zero-dollar menu. The company in February unveiled Perst, a free object database for embedded systems that it says can be used as a transparent persistence engine for Java and C# applications in as little as 30KB of device memory.

McObject’s flagship is extremeDB, a small footprint, in-memory embedded database engine for high-performance and high-availability embedded applications for telecom, netcom, set-top boxes and other consumer devices.

Perst stores data directly in Java or C# objects, according to a company statement, and thereby avoids the performance hit that would otherwise come with an object-to-relational database or mapper. The tool supports the .NET Compact Framework and can be used to build packaged software for Windows systems and for mobile, embedded and industrial control devices running Windows CE.

According to the company, Perst supports master and slave replication, provides XML import/export utilities, garbage collection and hanging references detection, and automatic schema evolution. And when used with AspectJ and JAssist aspect-oriented programming tools, Perst “provides completely transparent persistence,” the company says.

Perst, which was developed in Russia and used there since 2003, is licensed for public, noncommercial use under the GPL. Source code can be freely modified. Source code is available now at www.mcobject.com/downloads.php. Commercial licenses also are available; pricing was not disclosed.

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