IMS Database Application Development
 (IMB DB and HALDB)

Duration:   5 days

Participants:   Application programmers and developers who will be developing IMS DB applications using COBOL, mainframe Assembler, or PL/I.

Objectives:   Upon successful completion of this course you will be able to: -  Code and run batch and BMP programs that efficiently access and update IMS data-bases using CALL statements, program linkage, PCB masks, parameter passing, and status code analysis. -  Choose appropriate functions—GU, GN, GNP, GHU, GHN, GHNP, ISRT, REPL, DLET--and SSAs (Segment Search Arguments) to access or update data in the most efficient manner. -  Describe how the different database access methods, such as HDAM and HALDB (PHDAM, PHIDAM, PSINDEX), impact the usage of the functions (GU, GN, etc.) -  Extract relevant database information from DBDGENs and PSBGENs, to use when coding your IMS application programs. -  Explain how BTS (Batch Terminal Simulator) is used in the testing and debugging phases of development. -  Test commands and perform ad hoc database processing using DLT0. -  Debug common IMS application program abends. -  Implement IMS checkpoint/restart in your application programs.

Overview:   -  This in-depth course teaches the developer how to code and run IMS batch and BMP application programs that access and update IMS databases. Programming differences for the various IMS database access methods are included, from HDAM to HALDB differences. Developers should first attend our one-day IMS Fundamentals course to learn IMS concepts, terminology, and architecture. -  Subsequent courses are "IMS DC Application Programming" and "IMS MFS".

Prerequisites:   -  COBOL, mainframe Assembler, or PL/I programming experience; working knowledge of TSO and JCL and MVS basics. -  Attendance in the IMS Fundamentals course is required.

Format:   Lecture and hands-on computer workshops, using TSO, BMP, COBOL, and individual student IMS DBs. Alternatively, this course can also present mainframe Assembler, and PL/I examples, if developers prefer those languages to COBOL.

Topic Outline:   -  IMS Databases (DBs and HALDBs)         Physical data structures and access methods         HIDAM – Hierarchical Indexed Direct Access Method         HISAM – Hierarchical Indexed Sequential Access Method         HDAM – Hierarchical Direct Access Method         HSAM – Hierarchical Sequential Access Method         SI – Secondary index         SHIDAM – Simple Hierarchical Indexed Direct Access Method         SHDAM – Simple Hierarchical Indexed Sequential Access Method         HALDB (the newer partitioned DBs)         PHDAM - Partitioned HDAM         PHIDAM - Partitioned HIDAM         PSINDEX - Partitioned secondary index         Benefits of each access method         Database control blocks (physical and logical)              DBDGEN, PSBGEN              \Interpreting DBDGENs and PSBGENs -  Program Source Code         Sample Code—COBOL, HLASM (mainframe Assembler), PL/I         PCB mask         Access and update functions              Get Unique, Get Next, Get Next in Parent              Get Hold functions              Insert, Replace, Delete         SSAs         CALLs to DL/I – to access data in databases         SSAs (omitted, unqualified, qualified)         Status codes checking         Coding source programs              IMS program linkage                           COBOL, HLASM (mainframe Assembler), PL/I              Entry statement              Establishing PCB mask addressability              Use of key feedback area              Defining DL/I variables              CALL statement format              Debugging/testing routine         Boolean SSAs         Missing upper level SSAs in Get Unique         Insert logic for initial load              Impact of DB type on insert logic              Impact of HALDB on insert logic         Command codes              First, Last, Parent, Path,              No Replace, Concatenated Key,              Variable Place Holder -  Processing Environments         Batch Processing         BMP (Batch Message Processing)         Testing with BTS -  DLT0         Using DLT0 to test CALL statements, prior to coding in program         DLT0 for testing and small production jobs         Status statement         Call statement         Compare statement         Comments statement         DLT0 Data statement -  Debugging IMS Programs -  Application Program Design and Performance Considerations -  Impact of HALDB on Application Programs         New status codes regarding availability of partitions         Different rules for loading data into HALDBs         Different rules for accessing secondary indexes (PSINDEX         Impact on logical children         Impact on testing environment         Partition management         Efficiencies for processing HALDB -  Additional IMS Features         Secondary indexing              SIs vs PSINDEXs. Impact of HALDB         Multiple positioning         Checkpoint/restart              In Batch programs              In BMP (Batch Message Processing) programs              Considerations for online databases         Field-level sensitivity         Variable-length segments              Compression              Key compression              Data compression         System service calls -  Data Security, Reliability and Support         Image copy backups         Dynamic log         System log         Change accumulation         Forward and backward database recovery         Roll-out         IRLM, DBRC, DBCTL, XRF         Commit/rollback         Checkpoint/restart         IMS support utilities         Database Reorganization         Security -  Release 9 Enhancements for the Web (Optional)         Overview of how IMS is used in Web-based applications         Highlights of SOA (Service Oriented Architecture) and IMS, Java, JDBC,                 XML, SOAP, ODBC -  Highlights of Release 10 Web Support (Optional)

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