Mainframe Tutorial
JCL Tutorial
Introduction JCL and JES JCL Statements Fields of JCL Statement JOB statement EXEC Statement and its Parameters JOBLIB and STPELIB DD Statement DD DSN parameter DD DISP(Disposition) Paramter DD DCB Parameter DD UNIT Parameter DD VOLUME Parameter DD SPACE Parameter DD SYSOUT Parameter SYSIN (*) – Input Stream Data DUMMY Parameter SYSUDUMP DD statement SYSABEND DD statement CONCATENATION OF DATASET TEMPORARY DATASET REFERBACK JCL Procedure JCL In-Stream Procedure JCL Cataloged Procedure JCL Symbolic Parameters JCL Overriding Parameters in Proc Utilities, an Overview IEBGENER IEBCOPY IEHPROGM IEBCOMPR IEFBR14 GDG GDG Characteristics GDG Advantages and Coding Rules Creating GDG base Creating,Deleting GDG Dataset(GDS) Altering GDG base Deleting GDG base Concatenating Generations of GDG SORT/MERGE Intro SORT FIELDS MERGE FIELDS INCLUDE Statement OMIT Statement SUM FIELDS OUTFIL Statement OUTREC Statement OUTREC FILEDS or OUTREC BUILD OUTREC OVERLAY OUTREC FINDREP OUTREC IF THEN clauses INREC statement Role of JCL in COBOL Program Lifecycle Example of Running COBOL Program using JCL COBOL Tutorial
COBOL Introduction Overview, History & Importance COBOL Features COBOL Simple Example Program
COBOL Coding Sheet COBOL Program Structure COBOL Character Set COBOL Word Data Names and Identifiers COBOL Literals COBOL Figurative Constants Introduction IDENTIFICATION DIVISION ENVIRONMENT DIVISION CONFIGURATION SECTION INPUT-OUTPUT SECTION DATA DIVISION Data-item (variable) Declaration COBOL LEVEL Number COBOL Data-name and FILLER COBOL PICTURE clause and Data types COBOL EDITING Code characters COBOL VALUE clause Internal Data Represenataion in Mainframe. BCD and Binary Packed Decimal and Zoned Decimal Floating point binary number COBOL USAGE Clause SYNCHRONIZED/SYNC clause and slack bytes JUSTIFIED/JUST clause REDEFINES clause RENAMES clause (Level 66 Item) LEVEL 77 Data Item CONDITION NAME (LEVEL 88 Item) SIGN Clause Nameless data description entry FILE SECTION WORKING-STORAGE SECTION LOCAL-STORAGE SECTION LINKAGE SECTION PROCEDURE DIVISION Structure COBOL Verbs MOVE Verb Group Move using MOVE Quilification of Data Name in MOVE MOVE CORRESPONDING Option MOVE Reference Modification or Substring Move De-Editing using MOVE Aithmatic Verbs - Overview ADD Verb SUBTRACT Verb MULTIPLY Verb DIVIDE Verb ROUNDED Option ON SIZE ERROR Option ADD CORRESPONDING & SUBTRACT CORRESPONDING COMPUTE Verb DISPLAY verb ACCEPT Verb CONDITIONAL Verb : IF Categories of COBOL statements INITIALIZE Verb STOP RUN EXIT PROGRAM GO BACK "EXIT" and "END PROGRAM" Control Statements Intro Selection Statements IF ELSE and Nested IF EVALUATE Statement Iteration Statements Simple PERFORM In-line PERFORM PERFORM THRU/THROUGH PERFORM TIMES PERFORM UNTIL PERFORM VARYING PERFORM WITH TEST BEFORE/AFTER PERFORM for Multi-dimensional arrays Jump Statements CONTINUE Statement NEXT SENTENCE GO TO ALTER Statement String Handling in COBOL INSPECT EXAMINE STRING UNSTRING ARRAY (or TABLE) Single Dimensional ARRAY OCCURS Clause Two Dimensional ARRAY SUBSCRIPT ARRAY INDEX and INDEXING SUBSCRIPT vs INDEX SET Verb Sequential search:"SEARCH" Binary search:"SEARCH ALL" SEARCH vs SEARCH ALL FIles processing Terminologies File Handling Steps Step 1: File Allocation Step 2: File Definition Step 3: OPENing file Step 4: Processing of File READ Statement WRITE Statement REWRITE Statement START Statement DELETE Statement Step 5: CLOSEing file File Error Handling FILE Status Codes COPY Verb for Copybook Sub-programming and Calls Static Call and Dynamic Call Nested Programs END PROGRAM Statement IS GLOBAL clause IS EXTERNAL Clause IS {COMMON / INITIAL} PROGRAM SORT MERGE COBOL Program Lifecycle Compiling & Running COBOL Program COBOL – Database Interface concepts Embedded SQL DB2 Application Programming Host variables DCLGEN SQLCA SQL Queries DB2 Cursors INTRINSIC functions LE and LE callable services COBOL Performance Tuning tips VSAM Tutorial
Introduction VSAM Overview VSAM Cluster Data Componenet, CI, CA Index Componenet VSAM Splits and Spanned records Data set organization techniques KSDS ESDS RRDS LDS Comparison of VSAM types AMS Overview IDCAMS Utility IDCAMS DEFINE CLUSTER Command Defining KSDS Defining ESDS Defining RRDS Defining LDS IDCAMS REPRO Command Loading KSDS Loading ESDS Loading RRDS IDCAMS PRINT Command IDCAMS ALTER Command IDCAMS DELETE Command IDCAMS LISTCAT Command IDCAMS EXPORT Command IDCAMS IMPORT Command IDCAMS MODAL Command Alternate Index Overview Defining Alternate Index Building Index Defining Path VSAM Status codes
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About usVSAM arranges records by index key, relative record number, or relative byte address. It is used for direct or sequential processing of fixed-length and variable length records on DASD.
VSAM supports four types of data set organization techniques:-
Each of them are covered in detail in upcoming articles
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