| SQL adaptation guide for IBM DB2 UDB 10.x / Database concepts | |
As with Informix®, an IBM® DB2® database server can handle more than one database entity. Informix servers have an ID (INFORMIXSERVER) and databases are identified by name. IBM DB2 instances are identified by the DB2INSTANCE environment variable and databases have to be cataloged as data sources (see IBM DB2 documentation for more details).