Addressing OLTP Solutions with CICS: The Transaction Server ... - Ibm

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takes place over TCP/IP or SNA communications links. Figure 46 on page 166 illustrates the systems and connections. Most of the processing associated with a loan application is performed on the agent′s own processor. The people applying for the loan are invariably clients of the agent, and so the data relating to the client is held on the agent′s system. Once the agent′s system has performed basic checking, a CICS DPL is made to an application in CICSUP9 to get final approval for the loan. Lion Credit Union staff and the agents are also authorized to provide insurance quotations on behalf of Lion Insurance Limited. Quotation requests are transaction routed to the RISC System/6000 SP system on which the insurance application runs. Figure 46. Communicating with Other Members of CICS Family Products 11.7 Internet Access 166 CICS for AIX as the Transaction Server TDJ, like many corporations, is looking for opportunities to expand its customer base and has recognized the commercial potential of the Internet. Accordingly, TDJ has decided to update its existing applications such as the Accommodation Booking and Guest Invoice Systems with the accessibility and GUI of the Internet. TDJ has just installed the CICS Client for AIX and CICS Internet Gateway in its Web server (RISC System/6000 Model C10 running Internet Connection Server for AIX) so that customers worldwide can access the TDJ Accommodation Booking System using their own Web browsers across the Internet. Figure 47 on page 167 shows the configuration that services incoming work from the Internet.
Figure 47. Accessing CICS Applications from the Internet TDJ has also given some internal CICS applications with no Internet connection, such as the Accounting Control System, a much improved user interface by utilizing the Web browser as an alternative to the 3270 interface. The Web browsers can access any CICS region through the CICS Client running in same machine as the Web server. 11.8 Region Location and Security There are many CICS regions and thousands of clients in TDJ′s network. Security and resource management are important issues for TDJ. Accordingly TDJ has chosen to implement DCE CDS and security. DCE CDS dynamically manages the resolution of CICS regions and SFS server locations. DCE security services are used to authenticate CICS users. CICS internal security is then used additionally to control access to particular CICS resources such as transactions or files. The DCE servers are located on one node of the 8-node RISC System/6000 SP machine that TDJ owns (see Figure 48 on page 168). Availability is an important issue for TDJ. It does not want systems to be unavailable or inaccessible. Therefore it replicated its DCE CDS server. The replicated DCE CDS server is located on the 16-node RISC System/6000 SP. A separate machine was chosen, rather than another node on the 8-node RISC System/6000 SP machine, to Chapter 11. TDJ Enterprise International Limited 167
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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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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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emote DRDA database. Information ab
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As the COMMAREA has an allowable ma
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8.2 Workload Management 112 CICS fo
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