The Purpose DBDGEN Utility in IMS DB Programs

The DBDGEN utility generates DBDs for a database based on the type of database being used.

DBDGEN Utility Control Statements

The DBD statement names the database being described and provides DL/I with information concerning database organization.

The DATASET statement is used only in non-DEDB DBDGEN input record structures. The DATASET statement defines a data set group within a database. One or more DATASET statements follow the DBD statement.

The AREA statement is used only in DEDB DBDGEN input record structures. The AREA statement defines an area within a database. One or more AREA statements follow the DBD statement.

The SEGM statement defines the segments of the specified database. The SEGM statement is used with the following statements:

  • FIELD
  • XDFLD
  • LCHILD
  • DFSMARSH
  • DFSMAP
  • DFSCASE

Each statement defines different aspects of a segment or the fields in a segment. The DBDGEN statement indicates the end of DBDGEN control statements. FINISH is an optional statement retained in the input stream for compatibility.

The END statement indicates to the z/OS® assembler that the end of the input statements has been reached. More on DBD-Database Description Utility.

Databases That Use DBDGEN utility

  • HSAM (including SHSAM)
  • GSAM
  • HISAM (including SHISAM)
  • HDAM
  • PHDAM
  • HIDAM
  • PHIDAM
  • MSDB
  • DEDB
  • Index
    • Primary HIDAM
    • Secondary
  • PSINDEX
  • Logical

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Author: Srini

Experienced software developer. Skills in Development, Coding, Testing and Debugging. Good Data analytic skills (Data Warehousing and BI). Also skills in Mainframe.