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Asked: 2024-10-13T09:30:13+05:30 In:

what is the use of ovrdbf in as400?

Why do we use the OVRDBF (Override with Database File) command in AS400 applications? How does it work to override database file attributes in a CL or RPG program? What are the important parameters used in the OVRDBF command and provide examples of how the OVRDBF command is used in different situations such as using another file in place of some file etc.

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  1. Admin

    There are various uses of ovrdbf. Some of them are as follows:

    1. OVRDBF command can override the local file with a DDM file so that the program uses a remote rather than a local one.
    2. Using this command, you can change a physical file’s attribute.
    3. To access the file with a different name.
    4. To override a specific file member in case of a multimember file.
    5. To override a file to point to the file in a specific library.
    6. To override some of the parameters in the program, For example:
      • Position: It is used to specify the starting position for reading the records in the file. Possible values are *NONE, *START, *END, *RRN, *KEYB, *KEYBE, *KEY, *KEYAE, *KEYA.
      • OVRSCOPE: It is used to specify the scope of the override. Possible values are *ACTGRPDFN, *CALLVL, *JOB.
      • SHARE: It is used to specify whether the open data path would be shared with other programs in the job. Possible values are *NO, *YES.
      • OPNSCOPE: It is used to specify the scope of the open operation. Possible values are *ACTGRPDFN, *JOB.

    For example, the OVRDBF command can be written as:

    OVRDBF FILE(PF1)
TOFILE(TESTLIB/PF1) 
MBR(MBR1) 
OVRSCOPE(*CALLLVL)
SHARE(*NO) 
OPNSCOPE(*JOB)