Persistence Software Explained

Type:	Public
Industry:	Software
Founded:	in San Mateo, California, United States
Fate:	Acquired by Progress Software

Persistence Software was an American software company that operated from 1991 to 2004. Persistence developed software for object-relational mapping. The company was founded in 1991 by Derek Henninger, Christopher Keene and Richard Jensen in San Mateo, California, working with Stanford Professors Gio Wiederhold and Arthur M Keller, who was the Chief Technical Advisor. In 1999, Persistence Software went public on NASDAQ under the ticker symbol PRSW. In 2004, Progress Software bought Persistence for $16 million.^{[1] [2]}

History

Persistence Software started life as a spinoff from Lighthouse Design. As the original NeXTSTEP computer shipped with a relational database and Objective-C, Lighthouse engineers had created a simple mapping utility called Exploder to store objects in a relational database.

The Persistence team worked with Stanford Professors to extend the object-relational mapping technology by adding the concepts of mapping related objects.^[3]

Persistence created a series of products that integrated object-to-relational mapping, caching, and cache synchronization with automated cache management.^{[4] [5]} The products were marketed under the names PowerTier, EdgExtend, and DirectAlert.^[6]

Sun Microsystems licensed the Persistence technology in 1998 which was later incorporated into the Enterprise JavaBeans standard.^[7]

External links

• PowerTier overview from ServerWatch.
• PowerTier 6 product review from Java Developer's Journal

Notes and References

1. Web site: September 2004 . Progress Software buys Persistence . Progress Software.
2. Web site: September 2004 . Progress Software To Buy Persistence . Information Week.
3. Web site: August 1995. Agarwal, Shailesh . Keene, Christopher . Keller, Arthur M. . [ftp://db.stanford.edu/pub/keller/1995/high-perf.pdf Architecting Object Applications for High Performance with Relational Databases ]. Stanford University.
4. Web site: May 1993. Jensen, Richard . Agarwal, Shailesh . Keller, Arthur M. . Reflections on Object-Relational Applications . SIGMOD.
5. Web site: October 1995. Turner, Paul . Keller, Arthur M. . Reflections on Object-Relational Applications . OOPSLA Workshop on Object and Relational Databases.
6. Web site: August 2004 . Persistence Software Company Overview . Bloomberg BusinessWeek.
7. Web site: August 1995 . Persistence Software and Sun Microsystems Sign Technology Licensing Agreement . Business Wire.