Upgrade Guide for DB2 UDB for z/OS > Database and UI Upgrade Planning > Planning Your Upgrade >

Source and Target Database Planning

For recovery purposes, in-place mainframe-centric upgrades are not supported on the z/OS host. A target database is built for the new release and data is unloaded from the existing source database and migrated to the upgraded database.

During the planning process, you must decide whether the source and target databases are to be in different DB2 subsystems or in the same subsystem. If they are located in one DB2 subsystem, the databases must have different tableowner names and database prefixes. If the target and source databases are in different DB2 subsystems, one or two database prefixes and tableowner names can be used.

If you want to keep both source and target databases, you must plan for additional disk space. Verify that you have enough space on the z/OS host to allow for the unloading of datasets. Typically, you need at least 200 cylinders of space.

DB2 DSNZPARM Settings For the Target Database

For Siebel Business Applications to run correctly and efficiently, ensure that the DSNZPARM parameters for your target database are set correctly. For a list of the Siebel required and recommended DSNZPARM parameter settings for DB2 for z/OS v7 and DB2 for z/OS v8, see Implementing Siebel Business Applications on DB2 UDB for z/OS.