But it is an advanced full transaction database based on Java technology, which supports various open standards, triggers and stored programs. Java DB can be used in client-server mode or directly embedded into Java applications. In these cases, Java DB can run on the same Java Virtual Machine (JVM), so there is no need to purchase, download, install or manage this database separately from the application. Sun will provide support services for customers who choose to adopt Java DB in production. Javad: Programmers who have newly installed JDK 6 in the database of Java 6 may find that JDK 6 has added a directory named Javadb in addition to traditional directories such as B in and jre. This is a new member of Java 6: Java DB. This is an open source database management system (DBMS) implemented in pure Java, which originated from the Derby project under the name of Apache Software Foundation (ASF). Its size is only 3MB, which is pocket compared with G's database. However, this does not prevent Derby from being fully functional and supporting the features required by almost all database applications. More importantly, relying on ASF's strong community strength, Derby has been supported by big companies including IBM and Sun, as well as outstanding programmers all over the world. No wonder Sun Company chose its version 10.2.2 to be included in JDK 6 as an embedded database. This is like injecting a brand-new vitality into JDK: Java programmers can program a safe, easy-to-use, standard and free database without spending a lot of energy to install and configure the database.