Figure 3 shows how Text Extender is integrated into the DB2 partitioned database environment.
Figure 3. Integration of Text Extender into the DB2 partitioned database environment
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Each database partition server, known as a node, can be assigned to a separate machine, or they can be located on a single machine. Database partition servers located on separate machines are known as physical nodes. Those located on a single machine are known as logical nodes. Text Extender supports both configurations.
A nodegroup is a named subset of one or more database partitions servers. If a Text Extender-enabled table is assigned to a multipartition nodegroup, the text indexes that are created by Text Extender are located on the same node as each corresponding table partition. This ensures that data does not have to be moved between nodes during indexing.
A Text Extender server runs on every partition of a nodegroup and manages the indexed rows of the corresponding partition. You interact with Text Extender through one database partition. Each database partition can be used to issue Text Extender requests. The requests are routed to all the involved database partitions.