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

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1.5 OLTP Market 10 CICS for AIX as the Transaction Server Figure 4. A Distributed OLTP System At this point we expect you may be a bit confused about the OLTP complex and distributed OLTP. You may think that they are the same. We would like to clarify this. Distributed OLTP is a subset of the OLTP complex. In the simplest case, the OLTP complex consists of one distributed OLTP; then they are the same. Within an enterprise, a number of discrete OLTP systems that are distributed in functions and data can exist along the boundaries of the business units they serve. In the end these separate systems have to operate as one total system for the whole enterprise. We refer to this total system as the OLTP complex. The OLTP market is huge in both financial and technological terms. No serious players in the IT industry would ignore this market. To analyze this market in a logical way, we can broadly categorize the enterprises using OLTP into four quadrants based on a segmentation model (see Figure 5 on page 12). The OLTP market can be segmented according to the motives behind the deployment of the OLTP system by the enterprise. In the first quadrant, the enterprises mainly move their existing OLTP applications from their current host systems to the alternative platforms as a way of reducing the operational costs and the first step toward the readiness for a highly distributed, open, OLTP system configuration. The enterprises can be regarded as straightforward downsizers.
In the second quadrant, the enterprises purchase the readymade OLTP application solutions relevant to their industries as the means of assisting and supporting their business reengineering processes. As these are new OLTP applications most likely ready for a distributed open environment, it would be appropriate to implement them on the alternative server platforms. It is a direct replacement approach. The new configurations replace the existing OLTP applications and the associated host systems. In the third quadrant, the enterprises implement the three-tier client/server OLTP applications both to access host data and to interconnect existing OLTP applications running on different platforms. The three-tier client/server model is the same concept as the application server model. The resultant configuration is the distributed OLTP system. In the fourth quadrant, the enterprises target the ultimate goal of implementing enterprisewide client/server OLTP systems. The current host systems participate as distributed servers in the enterprisewide distributed networks interconnecting multivendor server computers and client computers. All of these computers work together to provide the full-function, enterprisewide OLTP system serving all eligible end users of the enterprise. As you can see in Figure 5 on page 12, the specific needs of the enterprise in each quadrant are quite different. Therefore the comprehensive OLTP solutions provided by the vendors must be highly flexible and meet most, if not all, of the enterprise requirements listed in Table 1 on page 9. Chapter 1. Introduction 11
Page 1: Addressing OLTP Solutions with CICS
Page 4 and 5: Take Note! Before using this inform
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Page 8 and 9: 9.4 Security Issues on the Internet
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Page 14 and 15: xii CICS for AIX as the Transaction
Page 16 and 17: The Team That Wrote This Redbook xi
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Page 20 and 21: 2 CICS for AIX as the Transaction S
Page 22 and 23: 1.2 Complex OLTP Business Environme
Page 24 and 25: Figure 2. OLTP Complex for XYZ Insu
Page 26 and 27: By using common application program
Page 30 and 31: Figure 5. OLTP Market Segmentation
Page 32 and 33: 14 CICS for AIX as the Transaction
Page 34 and 35: 2.1 IBM Software Servers 2.1.1 Lotu
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
Page 52 and 53: Figure 9. Interconnection Using Enc
Page 54 and 55: connect to a PPC Gateway server mac
Page 56 and 57: Figure 12. Interconnection Using TC
Page 58 and 59: 3.4.3 Configuration 3.4.4 Managing
Page 60 and 61: 3.4.6 Intersystem Communication CIC
Page 62 and 63: 3.4.8 Data Location 44 CICS for AIX
Page 64 and 65: 3.4.11 Operations plan to cope with
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
Page 72 and 73: By means of mapping files, you can
Page 74 and 75: 4.3 Versions 56 CICS for AIX as the
Page 76 and 77: 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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66 CICS for AIX as the Transaction
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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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emote DRDA database. Information ab
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As the COMMAREA has an allowable ma
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7.5 Summary 108 CICS for AIX as the
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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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