Oracle’s App Server Offerings: A High-Level Comparison
Ran across this post from the Dutch software and services company Yenlo that compares and contrasts Oracle’s major application server offerings. It would serve as a good starting point for deciding whether you truly need to pay the enormous licensing costs associated with a professional-grade application server platform, or if you were just wondering how to reconcile the continued existence of Oracle Application Server with WebLogic.
Source: yenlo.nl
Invalidating Toplink Session Cache To Avoid Stale Data
Toplink is a Java framework that maps objects to database tables. It is the reference implementation for the Java Persistence Architecture, or JPA. Developers use Toplink to manage data persistence (storage), queries, and transactions in an Oracle database. By default, Toplink makes use of a special cache called a Session Cache, maintained on the server, which is meant to speed up performance. Queried data is stored in the Session Cache and used in subsequent queries to reduce or eliminate calls to the database.
One problem with this approach is how to deal with “stale data”. In other words, what happens when data is changing in the database? How does the developer ensure that the cached data is current?
Source: blog.enkitec.com
