Residing on the DirectConnect server, a service library is a set of configuration properties that describes how its access services will function. The following service libraries reside on the DirectConnect server:
Transaction Router Service Library
DB2 Access Service Library
Administrative Service Library
Each TRS library contains a TRS that provides access to DB2 data and supports Open ServerConnect mainframe applications, defined to TRS as remote procedure calls (RPCs).
There are two TRS libraries:
TRSLU62 service library (TRS Service C) which uses the LU 6.2 communications protocol to talk to Mainframe Connect or to any Open ServerConnect application running in CICS.
TRSTCP service library (TRS Service D) which uses the Transmission Control Protocol/Internet Protocol (TCP/IP) communications protocol to talk to MainframeConnect or any Open ServerConnect application running in CICS.
Having multiple instances of a TRS library on a server results in different physical copies of the shared library files that constitute the TRS component.
For an explanation of the TRS components of DirectConnect, see the DirectConnect Transaction Router Service User’s Guide.
The DB2 access service library contains DB2 access services (Service A and Service B) that interface with MainframeConnect for DB2 to allow clients to access DB2 data in a DB2 UDB database.
Each DB2 access service is a specific set of configuration properties that perform the following:
Transform SQL
Convert datatypes
Support RPCs
Transfer data between DB2 UDB and other servers accessible through Open Client
Support catalog stored procedures (CSPs) and system stored procedures
Support RSPs and host-resident requests
The Administrative service library provides specific administrative services for all DirectConnect libraries, including logging, tracing, and allowing remote configuration of DirectConnect access services (for example, through DirectConnect Manager).
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