By IBM Redbooks, Bart Steegmans
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Extra resources for DB2 for Z/OS and Os/390: Ready for Java
This is very likely to change. In the future there may not be a need to have a complete DB2 system installed to be able to perform the required AR functionality to access the database server. Note that from a performance standpoint this is not the ideal configuration, as there is the additional overhead of having to route every SQL request over DRDA over (most likely) TCP/IP to a remote DB2 system. 3 Developing a Java application using JDBC Let us now look at how to develop a Java application that wants to talk to a database through JDBC.
So you may ask yourself, why is there a DB2 Connect Server in the figure, if it is not required? The reason is that DB2 Connect Server provides functionality that is not provided by the Type 4 driver. These functions include sysplex awareness and connection concentration. These functions can be very valuable in large installations. For a more detailed description of these features, please see Distributed Functions of DB2 for z/OS and OS/390, SG24-6952. 4 Type 2 connectivity from a non-z/OS platform As a Type 2 driver is normally a local driver, and in this configuration the DB2 for z/OS and OS/390 system is not local to the JDBC driver, you need something in the middle.
In most DB2 installations, different databases (and subsystems) are used to store the data in a development versus a production environment. For example, the test data is stored in a test subsystem called DB2T, while the production database is run in the production subsystem DB2P. In this case, when an application is migrated from test to production, the URL will have to be changed for all drivers when the DriverManager interface is used. A way to avoid this problem is to externalize all references to the driver and connection, and load it into the application at execution time.
DB2 for Z/OS and Os/390: Ready for Java by IBM Redbooks, Bart Steegmans