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

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Figure 30. CICS Access to Remote DB2 for AIX Databases The remote configuration is the most commonly chosen method for production because it provides a dedicated database machine. The DB2 for AIX server is not competing with the CICS for AIX region for system resources such as processor cycles and memory. This can lead to improved performance of the CICS for AIX region when compared with the local configuration (depending on how constrained the local configuration is). The planning items for for the local configuration are also applicable to a remote configuration. 7.4.2 Accessing a DB2 for OS/2 or DB2 for Windows NT Database 102 CICS for AIX as the Transaction Server Figure 31 shows a configuration in which a CICS for AIX region accesses one of the Intel-based versions of DB2, DB2 for OS/2, or DB2 for Windows NT. The CICS for AIX region resides in the local RISC System/6000 machine where the DB2 Client for AIX was configured after CAE was installed. DB2 Server for OS/2 or DB2 Server for Windows NT must be installed on the remote database Intel-based machine, and an instance of the DB2 server must be created there. Figure 31. CICS for AIX Access to Remote DB2 for OS/2 or DB2 for Windows NT Database A shared object, an XAD entry, and the switch load file are required on the local (CICS for AIX region) machine. The DB2INSTANCE environment variable must be set to the DB2 instance name, and it must be present on both the local and the remote machines.
7.4.3 Accessing a DB2 for MVS/ESA Database through DDCS CICS for AIX can access enterprise data stored in DB2 for MVS/ESA databases through the use of DDCS for AIX. The DB2 for MVS/ESA database server is the DRDA application server; it is the only means of connecting the DB2 for AIX client to the DB2 for MVS/ESA server. The network protocol over which the connection occurs is restricted to SNA LU 6.2, and DDCS must be used. DDCS can be installed in a separate machine that sits between the local RISC System/6000 machine containing CICS for AIX and the DB2 for AIX client. For simplicity, we illustrate DDCS installed in the local machine. DRDA is the foundation of IBM′s distributed database solution. It is a set of protocols that enable transparent connectivity between RDBMSs on different platforms and at different geographical locations. DRDA coordinates communication between systems by defining what must be exchanged and how it must be exchanged. For more details on DRDA, see the DRDA Planning for Distributed Relational Databases, SC26-4650-00. A CICS for AIX application issues an SQL call, using CAE running in the local RISC System/6000 machine. The CAE then uses the services of DDCS to carry the SQL request directly to the distributed data facility (DDF), a component of DB2 for MVS/ESA. The DDF passes on the SQL request to the DB2 for MVS/ESA database server for processing. Figure 32 shows the products involved when an application running in a CICS for AIX region accesses DB2 for MVS/ESA databases using DDCS for AIX over an SNA connection. Figure 32. CICS for AIX Access to Remote DB2 for MVS/ESA Database Using DDCS 7.4.3.1 Planning Considerations A DRDA database located on an MVS/ESA host that is to be accessed using DDCS must be identified by an XAD entry with a unique XA open string. DDCS is XA-compliant and comes with an LU 6.2 syncpoint manager; therefore it can participate in a two-phase commit process, with CICS for AIX as the coordinator. Configuring DDCS requires detailed knowledge of SNA in addition to knowledge of DB2. Two sets of complex SNA-related definitions with matching attributes on both of the connecting machines must be created. It is very important to ensure that the connection is configured correctly to ensure the proper operation of the Chapter 7. Interactions with the DB2 Family of Products 103
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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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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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