1. Mar 25, 200291.3913 R McFadyen1 Persistent Objects http://www.mgm-edv.de/ejbsig/ejbtools_tabled.html Lists a number of EJB-related products, some of which provide object to relational mapping services CoCoBase TopLink enJin

2. Mar 25, 200291.3913 R McFadyen2 Persistent Objects enJin: the following is from: http://www.versant.com/products/enjin/whitepapers/WP_Benchmark-011022r4-W.pdf “With the increasing dominance of Enterprise Java Application Servers in e-business, a need has emerged... Studies of Application Server performance in typical deployment architectures have found that up to 61% of processing time for J2EE Application Server based applications can be due to the latency between the middle-tier application servers, and the back-end tier relational database1.

3. Mar 25, 200291.3913 R McFadyen3 Persistent Objects enJin: the following is from: http://www.versant.com/products/enjin/whitepapers/WP_Benchmark-011022r4-W.pdf “… This object-to-relational bottleneck is often referred to as an 'impedance mismatch', since in order to store data in an RDBMS, objects must be broken down into flat table structures, and to retrieve objects, they must be built up from these RDBMS 'flat' structures. This white paper examines the performance characteristics of a product that has been designed specifically to overcome this object-to- relational impedance mismatch, and which successfully improves both the response times and transaction throughput of applications deployed on J2EE application servers such as IBM's WebSphere.

4. Mar 25, 200291.3913 R McFadyen4 Persistent Objects High Level enJin Architecture from http://www.versant.com/products/enjin/whitepapers/WP_Benchmark-011022r4-W.pdf

5. Mar 25, 200291.3913 R McFadyen5 Persistent Objects TopLink a commercial product that provides object to relational mapping capability “In an enterprise Java environment, one of the most formidable challenges is storing business objects and components in a relational database (RDB). WebGain TopLink provides developers with the flexibility to map objects and Enterprise Java Beans to a relational database schema with minimal impact on ideal application design or database integrity. The result — developers focused on addressing business needs rather than building infrastructure. We’ll look briefly at http://www.webgain.com/products/toplink/whitepapers/addvalueover_ejb2.html