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InfoQ Homepage News Perst Embedded Database Releases Version 3.0

Perst Embedded Database Releases Version 3.0

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McObject® has released Perst™ version 3.0, a major upgrade of its open source, object-oriented embedded database system.  Persist is dual licensed (commerical and GPL), allowing it to be used freely in non-commercial applications.

Persist is describes itself as:

Being ideal for Java applications requiring a modest footprint and fast, multi-platform data management. Typical uses include packaged software, mobile and embedded applications, Web services and industrial systems. With a run-time code footprint of between 30K and 300K, Perst fits well within the resource constraints of many embedded systems.

Persist also reduces some of the complexities of working with object-oriented databases:

Perst’s fundamental achievement lies in making persistent Java objects as efficient and easy to use as possible. In most cases, Perst automatically loads the persistent objects without explicit programmer command. When used with aspect-oriented tools such as AspectJ and JAssist, Perst provides completely transparent persistence.

Unlike many other object-oriented databases, Perst requires no dedicated compiler, byte code processor or specialized Java run-time environment, yet provides a high degree of application transparency. The Perst API is convenient, flexible and easy to use. Perst requires no end-user administration, and along with its simplicity, Perst ensures integrity via transactions that adhere to the “ACID” properties (Atomicity, Consistency, Isolation and Durability) with very fast recovery.

The new version of the database includes:

  • Better documentation, including a MSDN-like API guide for .NET users, 38 page introduction, and tutorial with code examples that range from the basics of creating, opening and storing object to advanced topics such as schema evolution and database replication
  • Improved full-text search engine with greater efficiency and smaller footprint
  • Powerful on-the-fly compression for Persist Lite, the Java ME version, that reduces the stored data size by three to five times on average
  • Support for .NET Language Integrated Query (LINQ)

Persist can be downloaded from, the full press release as well Java and .NET version can be downloaded from the McObject's web site.

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Community comments

  • License

    by Thomas Mueller,

    Your message is awaiting moderation. Thank you for participating in the discussion.

    I don't like the license terms: The GPL version is only for non-commercial use.

  • Re: License

    by Ian Phillips,

    Your message is awaiting moderation. Thank you for participating in the discussion.

    allowing it to be used freely in non-commercial applications

    Well, that's not really true now is it. The 2 licenses that are available are commercial and GPL, if it's encumbered by the GPL then it's most definitely not available to be used freely.

    Note that this isn't an attack on the GPL, which is a fine license, it just irks me when people equate the terms of the GPL with free usage. Oh, and another inaccuracy springs to mind: the GPL explicitly allows commercial usage, albeit under fairly onerous terms, so that part of the intro is wrong as well.

  • Re: License

    by Ian Phillips,

    Your message is awaiting moderation. Thank you for participating in the discussion.

    Oops! That was meant to be a reply to the original article, not to your comment Thomas.

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