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10.8 Summary 154 CICS for AIX as the Transaction Server CICS user files (files defined within the File Definitions (FD) stanza) can be managed on either a DB2 Version 2 (CICS for AIX only) database or an Encina SFS. Either file manager can permit data to be shared between two or more regions and between regions and non-CICS applications such as batch processing programs. When designing systems to exploit these facilities, you will have to consider the networking costs of transferring data between the file manager and its client, and the benefits of distributing the processing and disk access load between several machines. CICS attempts to minimize network traffic by avoiding unnecessary interactions with the file manager. For example, at the end of a transaction CICS will retain an SFS open file descriptor for possible reuse where a region uses SFS for file access services. Such open file descriptors are released when the file is closed, either by an explicit EXEC CICS SET FILE CLOSED request or when CICS is shut down. In developing applications for a CICS environment it is important that you understand the facilities that are available and the way in which CICS processes work so that you can work with the CICS architecture and not against it. In this chapter we discuss the key issues that you have to consider. There are multiple ways in which to code applications. The style most suitable for your applications will depend on what those applications will do. CICS provides tools to assist in the development and debugging of applications. Those applications can be written in multiple languages. The availability of the CICS ECI and EPI programming interfaces greatly improves your ability to extend client-server systems. You are no longer bound by the constraints of a 3270 data stream and BMS maps. GUIs as a front end to a CICS client are now possible, providing a very modern user interface.
Part 3. The Implementation Having identified the problem, that is, how to develop and manage OLTP systems, and the solution, IBM Transaction Server for AIX, we now look at a sample environment to discover how IBM Transaction Server for AIX can help facilitate complex OLTP. © Copyright IBM Corp. 1996 155
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Addressing OLTP Solutions with CICS
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Take Note! Before using this inform
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iv CICS for AIX as the Transaction
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9.4 Security Issues on the Internet
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viii CICS for AIX as the Transactio
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x CICS for AIX as the Transaction S
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xii CICS for AIX as the Transaction
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The Team That Wrote This Redbook xi
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xvi CICS for AIX as the Transaction
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2 CICS for AIX as the Transaction S
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1.2 Complex OLTP Business Environme
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Figure 2. OLTP Complex for XYZ Insu
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By using common application program
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1.5 OLTP Market 10 CICS for AIX as
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Figure 5. OLTP Market Segmentation
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14 CICS for AIX as the Transaction
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2.1 IBM Software Servers 2.1.1 Lotu
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2.2.1 CICS Clients V1.1.0 A Transac
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2.2.4 CICS Internet Gateway for AIX
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3.1 Services CICS for AIX is a very
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3.1.2 CICS API 24 CICS for AIX as t
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3.1.3.1 Terminal Users and CICS Reg
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3.2 Implementation 3.2.1 Components
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3.2.2 Processes 3.2.1.3 Application
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3.3.1 DCE RPC 3.3.2 TCP/IP 32 CICS
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Figure 9. Interconnection Using Enc
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connect to a PPC Gateway server mac
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Figure 12. Interconnection Using TC
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3.4.3 Configuration 3.4.4 Managing
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3.4.6 Intersystem Communication CIC
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3.4.8 Data Location 44 CICS for AIX
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3.4.11 Operations plan to cope with
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3.5 Summary 48 CICS for AIX as the
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Figure 13. Application Server Model
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4.2.1 CICS External Call Interface
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By means of mapping files, you can
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4.3 Versions 56 CICS for AIX as the
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4.4 Sample Network Configurations 4
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4.5.1 CICS Client for OS/2 60 CICS
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4.5.2 CICS Client for DOS 62 CICS f
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4.5.5 CICS Client for AIX CICS Clie
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4.6 Summary 68 CICS for AIX as the
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5.1.1 DCE Threads 5.1.2 Remote Proc
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The GDS is based on the CCITT X.500
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egion or server it is looking for.
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6.1.2 Encina Toolkit Server Core 6.
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is also necessary to use native AIX
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7.1 X/Open XA Interface 7.1.1 X/Ope
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Communication between the transacti
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7.2.2 Single-Phase and Two-Phase co
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Figure 28. Switching Access among D
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Figure 30. CICS Access to Remote DB
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