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

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4.4 Sample Network Configurations 4.4.1 TCP/IP CICS Clients can access CICS for AIX servers in your network in numerous ways. In this section we discuss some of these network configurations. Two communication protocols, APPC and TCP/IP, are applicable for connections with the CICS for AIX servers. If you are already using a particular protocol, you may want to continue with that protocol alone. The Table 3 on page 42 shows the four communication methods available for connections to the CICS for AIX server. As none of the CICS Clients supports communication at synchronization level 2, the Encina PPC TCP/IP and Encina PPC Gateway methods are irrelevant in our discussion. The CICS family TCP/IP and local SNA methods are applicable for the connections between CICS Clients and the CICS for AIX server. If you have to connect different types of networks, for example, token-ring and Ethernet networks, you probably want to use TCP/IP. Indeed, TCP/IP is assuming ever greater importance and use in Internet communication. Also TCP/IP is the default communication protocol with the AIX operating system. You do not have to install an additional product as is the case with APPC. Using TCP/IP, all clients on a LAN can connect to the CICS for AIX server. Figure 18 shows CICS Clients communicating with a CICS for AIX server through TCP/IP. Figure 18. CICS Clients on a LAN Communicating over TCP/IP 58 CICS for AIX as the Transaction Server
4.4.2 APPC Using APPC, CICS Client for OS/2, CICS Client for Windows, CICS Client for DOS, and CICS Client for Macintosh can connect to the CICS for AIX server. This communication is commonly achieved through a LAN and a workstation acting as a SNA gateway. However, for the CICS Client for OS/2 and CICS Client for Windows it is also possible to communicate directly with a CICS for AIX server without the need for a gateway workstation (see Figure 19). Examples include CM/2 for the CICS Client for OS/2, and IBM APPC Networking Services for Windows for the CICS Client for Windows. A supported SNA product, for example, SNA Server for AIX, must be installed on the same machine as the CICS for AIX region if local SNA support (see Table 3 on page 42) is used. Figure 19. CICS Clients Communicating over APPC For scenarios using APPC through a LAN and a SNA gateway, see CICS Clients Unmasked, SG24-2534-01. 4.5 Planning Considerations for CICS Clients In deciding which CICS Client to use, you may believe that the answer is predetermined because your decision largely depends on the existing hardware and operating system on the desktop of the end user. This probably holds true in some cases, but not in all. The assumption that the end user does not have the budget to acquire a newer, better desktop computer and possibly a different operating system is not always correct. The connection to the CICS for AIX server from the desktop machine through the appropriate CICS Clients enables the end user to run the mission-critical OLTP applications while able to operating existing workstation-based applications. You, as a planner. have to review the functions provided by each type of CICS Clients, cross-check them with the needs of the proposed CICS system or application, and then select the best CICS Client. Getting the functions that are needed for users to do their jobs correctly and efficiently will save you more in the long term than simply not paying for the upgrade of the desktop machines now. Higher efficiency and productivity gains cover the outlay of the capital investment in most cases. For example, a CICS Client for AIX ECI application is the only CICS Client that CICS Systems Manager for AIX supports for workload balancing. The Workload Client code integrates and works well with CICS Client Chapter 4. Using CICS Clients 59
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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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Page 30 and 31: Figure 5. OLTP Market Segmentation
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Page 36 and 37: 2.2.1 CICS Clients V1.1.0 A Transac
Page 38 and 39: 2.2.4 CICS Internet Gateway for AIX
Page 40 and 41: 3.1 Services CICS for AIX is a very
Page 42 and 43: 3.1.2 CICS API 24 CICS for AIX as t
Page 44 and 45: 3.1.3.1 Terminal Users and CICS Reg
Page 46 and 47: 3.2 Implementation 3.2.1 Components
Page 48 and 49: 3.2.2 Processes 3.2.1.3 Application
Page 50 and 51: 3.3.1 DCE RPC 3.3.2 TCP/IP 32 CICS
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Page 56 and 57: Figure 12. Interconnection Using TC
Page 58 and 59: 3.4.3 Configuration 3.4.4 Managing
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Page 62 and 63: 3.4.8 Data Location 44 CICS for AIX
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Page 66 and 67: 3.5 Summary 48 CICS for AIX as the
Page 68 and 69: Figure 13. Application Server Model
Page 70 and 71: 4.2.1 CICS External Call Interface
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Page 82 and 83: 4.5.5 CICS Client for AIX CICS Clie
Page 86 and 87: 4.6 Summary 68 CICS for AIX as the
Page 88 and 89: 5.1.1 DCE Threads 5.1.2 Remote Proc
Page 90 and 91: The GDS is based on the CCITT X.500
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Page 104 and 105: 7.1 X/Open XA Interface 7.1.1 X/Ope
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7.5 Summary 108 CICS for AIX as the
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110 CICS for AIX as the Transaction
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8.2 Workload Management 112 CICS fo
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8.4.2 System Management Application
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Figure 36. The CICS SM GUI 8.4.6 Di
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Figure 37. CICS SM Component Distri
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Figure 38. Combining Resources 122
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8.5.2 The Reference System 124 CICS
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8.6 Planning Considerations for CIC
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9.1 Some Terminology 9.2 Services 1
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Figure 41. CICS Internet Gateway fo
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9.3.3 Data Integrity The Web was or
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9.3.5 High Availability The drawbac
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or employee records, eavesdropping
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• Type, size, and quantity of rec
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10.3.3 Writing ECI and EPI Applicat
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The ANIMATOR debugging tool enables
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10.8 Summary 154 CICS for AIX as th
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11.1 The Big Picture 158 CICS for A
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11.2 User Access 160 CICS for AIX a
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Figure 44. Access to Various DB2 Da
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takes place over TCP/IP or SNA comm
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provide greater protection in the u
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How Customers Can Get ITSO Redbooks
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design. The process of composing a
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A year later ISC gave SQL formal in
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designing efficient applications 15
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IBML ® Printed in U.S.A. SG24-4752
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