16 Siebel 7.8 with IBM DB2 UDB V8.2 Handbook
The DB2 UDB client software is installed on the Siebel servers and is not
required on the Siebel Web clients.
Engine dispatchable units
The circles or sets of circles on the DB2 UDB server diagram shown in
Figure 2-3 on page 15 represent engine dispatchable units or EDUs. On
Windows platforms, EDUs are threads within a user process. On UNIX®
platforms, EDUs are processes. The listeners that the client application uses to
connect to DB2 UDB are specialized EDU processes.
db2agents are by far the most common type of EDU. db2agents perform most of
the SQL work required by applications. Other EDU types include loggers and
deadlock detectors.
The connection with the application is managed by the Coordinator ...