Testing › Overriding Subschemas (Release 10.2)

Overriding Subschemas (Release 10.2)

You can override the program-specified subschema to access a test database that exists in a multiple-database environment. This allows you to perform testing without disrupting the production environment.

The procedures for overriding subschemas differ in the batch and the online environment.

Database Name Table

A database to be accessed by an application program with navigational DML must have one or more subschemas defined for it. The central version maintains this association in the database name table created prior to Release 12.0 where an entry exists for each database that can be accessed under that central version. A database name table entry includes the following information:

• The name of the database
• The names of the subschemas that map to the database
• For each subschema that maps to the database, the name of an equivalent subschema that provides the same database perspective (that is, the same record definitions) but maps to different page ranges (that is, different data)