Application requester
The z/TPF application requester (z/TPFAR) supports
IBM's Distributed
Relational Database Architecture (DRDA)
strategy for database distribution using the remote unit of work method
of distributed access. DRDA is
a relational database connection architecture, consisting of protocols
for communications between an application and a remote database, and
for communications between databases.
Distributed access
involves working with data that is located on remote systems. A relational
database is a database in which the data is organized and accessed
according to relations. Structured Query Language (SQL) is a programming
language used to define relational data, access relational data, and
control access to relational data resources.
z/TPFAR permits you to share data between any DRDA- compliant database servers, such as a Db2® relational database and a z/TPF application using the SQL interface. The component of Db2 that allows the z/TPFAR connection is known as an application server (AS). For more information about the concept of an application server, see Access to remote data or the Distributed Relational Database Architecture Reference. An LU 6.2 conversation or a TCP/IP connection is used to connect a Db2 subsystem with z/TPFAR. By using z/TPFAR, a z/TPF application can directly access and update the information residing on the remote Db2 subsystem.