January 2005
Beginner to intermediate
928 pages
22h 14m
English
book
Understanding DB2®: Learning Visually with Examples
by Raul F. Chong, Clara Liu, Sylvia F. Qi, Dwaine R. Snow
Content preview from Understanding DB2®: Learning Visually with Examples
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2.4. Federation
Database federated support in DB2 allows tables from multiple databases to be presented as local tables to a DB2 server. The databases may be local or remote; they can also belong to different RDBMSs. While Chapter 1 briefly introduced federated support, this section provides an overview of how federation is implemented.
First of all, make sure that your server allows federated support: The database manager parameter FEDERATED must be set to YES.
DB2 uses NICKNAME, SERVER, WRAPPER, and USER MAPPING objects to implement federation. Let's consider the example illustrated in Figure 2.7.
Figure 2.7. An overview of a federation environment
The DB2 user db2user connects to the database db2db. He then issues the ...
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