An access service is the client connection point for a DirectConnect server. It is the pairing of a service library with a set of specific values for the configuration properties.
A DB2 access service works with MainframeConnect for DB2 UDB to allow clients to access DB2 data.
Each access service is a specific set of configuration properties that:
Transforms SQL
Convert datatypes
Supports remote stored procedures (RPCs)
Transfers data between DB2 UDB and other servers accessible through Open Client
Supports Catalog Stored Procedures (CSPs) and system stored procedures
Supports RSPs and host-resident requests
For more information about the DirectConnect for z/OS DB2 UDB Access Service Library, see the Mainframe Connect DirectConnect for z/OS Option User’s Guide for DB2 Access Services.
Each TRS library contains a TRS that provides access to DB2 data and supports Open ServerConnect™ mainframe applications, defined to TRS as (RPCs).
The TRS access service routes requests from remote LAN-based clients to Open ServerConnect transactions. Optionally, it can also route requests to MainframeConnect™ for DB2 UDB and return results to the client.
Security can also be configured on a transaction or user basis.
There are two TRS service libraries:
TRSLU62 service library, which uses the LU 6.2 communications protocol to talk to Mainframe Connect or any Open ServerConnect application running in CICS
TRSTCP service library, which uses the Transmission Control Protocol/Internet Protocol (TCP/IP) communications protocol to talk to MainframeConnect for DB2 UDB 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.
An explanation of the TRS components of DirectConnect can be found in the DirectConnect Transaction Router Service User’s Guide.
The Administrative Service Library provides specific administrative services for all DirectConnect libraries, including writing to logs and allowing remote configuration of DirectConnect services (for example, through DirectConnect Manager).
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