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

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Figure 28. Switching Access among DB2 for AIX Databases 7.4 Planning Considerations for DB2 Family Access In this section we explain how each DB2 family product can be accessed by a CICS for AIX application and discuss any planning considerations relevant to each product. 7.4.1 Accessing a DB2 for AIX Database 98 CICS for AIX as the Transaction Server In this section we look at how DB2 for AIX databases can be accessed by a CICS application running in a CICS for AIX region. We restrict our discussion to XA-enabled databases only. There are two possible configurations for CICS for AIX to DB2 for AIX communication: local and remote. 7.4.1.1 Local Configuration This is the simplest configuration for an application in a CICS for AIX region to access DB2 databases. Both the CICS for AIX region and the DB2 for AIX server reside in the same RISC System/6000 machine. IBM DB2 Server for AIX must be installed on the local machine, and an instance of a DB2 for AIX server has to be created on that machine.
At CICS startup time, each CICS application server process (cicsas) establishes the XA connection using the XA open string obtained from the XAD stanza file entry. See CICS on Open Systems Administration Reference, SC33-1563-01 for more details. It is important to define the XAD stanza file entry correctly, particularly the path location of the switch load file and the XA open string. If the cicsas cannot connect to the database because either the database is not active or because the XAD stanza file entries are incorrect, the CICS for AIX region will abend at startup. Figure 29 shows the local implementation of a DB2 for AIX database being accessed from a CICS for AIX region. Figure 29. CICS Access to Local DB2 for AIX Database As DB2 for AIX uses a database name in the XA open string, you have to create the database before region startup. Switch Load File: CICS for AIX provides two versions of the switch load file: cics1pcdb2 for single-phase commit and cicszadb2 for two-phase commit. Select the version that is appropriate for your configuration. Regardless of whether the DB2 for AIX databases are accessed using a local or remote configuration, the entries in the XAD stanza file for the databases will be the same; that is, there are no location-specific parameter considerations. We do not recommend that you create your own version of the switch load file. CICS for AIX Region Environment Setup: In the /var/cics_regions/ region directory, the environment file is used to set environment variables on region startup. The environment variable for DB2 for AIX is DB2INSTANCE. This variable specifies the instance name of the DB2 server to which CICS is to refer. As there is only one DB2INSTANCE variable, a CICS for AIX region can only connect to the databases of that instance. Shared Object: You have to create a DB2 for AIX shared object code. As its name suggests, the shared code is loaded into memory once in the shared library segment and shared by all processes that reference it. The CICS for AIX COBOL run-time environment, CICS for AIX C transactions, and the switch load file must reference the DB2 for AIX shared object at run time. See DB2 for AIX Chapter 7. Interactions with the DB2 Family of Products 99
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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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Page 68 and 69: Figure 13. Application Server Model
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Page 78 and 79: 4.5.1 CICS Client for OS/2 60 CICS
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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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