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

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Figure 44. Access to Various DB2 Databases from CICS 162 CICS for AIX as the Transaction Server CICS for AIX region CICKAR8 serves the Kangaroo Hotels Corporation within the Kangaroo Leisure Group. The main CICS application suites that run in this region are the Accommodation Booking System and the Guest Invoice System. The databases for these two applications reside in a separate RISC System/6000 system running an instance of DB2 for AIX server called DBKARB. This provides a dedicated database machine, which gives the required throughput for the busy applications that these databases serve. There are some local DB2 for AIX databases that CICKAR8 can access. The use of these local databases is very light, so their presence in the same machine as CICKAR8 does not cause any noticeable impact on the performance of CICKAR8. The Kangaroo Hotels Corporation is committed to providing a very high quality service to its hotel guests and patrons. It does not want to cause any frustration and anger among them due to data integrity problems with its IT systems. So, all the DB2 databases are XA enabled with two-phase commit. The single-phase commit optimization is not a viable option as updates are performed on other systems through the Encina PPC Gateway. CICS for AIX region CICKAR8 still uses a local Encina SFS as its file manager, not DB2 for AIX. The fact that nonrecoverable CICS resources are supported as recoverable resources on DB2 would require the rewriting of several existing CICS applications. This requires significant programming effort; hence it was
11.4 File Systems 11.5 Increased Availability decided not to use DB2 for AIX as the CICS queue or file manager. The decision may be reviewed in the future. Other DB2 databases reside on OS/2 and Windows NT platforms. They are for tour booking and function room reservation. CICS for AIX region CICKAR8 can access these databases in the same way as the remote DB2 for AIX databases, that is, through the X/Open XA interface and CAE. To provide comprehensive flight reservation services for hotel guests and other potential travelers, the CICKAR8 region needs to access the Airlines Reservation databases of Kangaroo Airlines that reside on the mainframe computers. This connection is achieved through two separate SNA connections to two MVS/ESA systems from the local RISC System/6000 system running CICKAR8. One connection is through an Encina PPC Gateway, and the other uses CAE and DDCS. The path through CAE and DDCS is the primary route for accessing the Airlines Reservation databases owned by the DB2 for MVS/ESA server DBHQ03. The authentication type of authentication = DCS has been defined for these databases; hence the user name and password are to be validated at the mainframe host. The path through the Encina PPC Gateway is an alternative route to get the same information. Because of the limitation of a maximum size of 32 KB for data passed in the COMMAREA, the use of this route is restricted to queries on Kangaroo Airlines flight schedules. The majority of TDJ′s enterprise data is held in DB2 databases. The potential for Encina SFS use is therefore limited. TDJ does use Encina SFS to manage accounting data shared by several CICS regions because an Encina SFS server is ideally suited to this sort of application. The Encina SFS server is in the same cell as the CICS regions that access it. Encina SFS servers are used widely by CICS regions such as CICKAR8 to manage CICS queues, although this decision is currently under review. Lion Insurance Limited has become a leading presence in the direct selling of insurance to the public. Customers call a toll-free number and can receive an insurance quotation for car, travel, or house. The customer phone calls are taken by a team of a dedicated sales personnel. During the course of the call, the customer′s details are taken, a quotation is prepared, and the premium calculated. The customer can then decide to accept the quotation or not. Being able to provide such a system calls for a highly available, quick-response quotation system. To improve the quality of service to the customer, staff other than the dedicated insurance sales team can access the insurance quotation system. Thus it is possible for a customer to receive an insurance quotation without having to be transferred to an insurance agent. Such quotations generate only a small volume of work. Lion Insurance Limited realizes that selling insurance is very competitive and that high availability of the quotation system is essential to its public image. Lion Insurance has developed a CICS service specifically to meet the need for a high availability, highly performing system. A 16-node RISC System/6000 SP Chapter 11. TDJ Enterprise International Limited 163
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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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