Overview of Master and Access Files

The server processes a report request with the following steps:

  1. It locates the Master File for the Adabas file. The file name in the report request is the same as the z/OS PDS member name.
  2. It detects the SUFFIX attribute, ADBSINX, in the Master File. Since this value indicates that the data resides in an Adabas file, it passes control to the adapter.
  3. The adapter locates the corresponding Access File and uses the information contained in both the Master and Access Files to generate the Adabas direct calls required by the report request. It passes these direct calls to the Adabas DBMS.
  4. The adapter retrieves the data generated by the Adabas DBMS and returns control to the server. For some operations, the server may perform additional processing on the returned data.
  5. Beginning with Version 7 Release 7.4 of the server, the same adapter supports access to the database with different SVCs through different connections (see Connection Name in Connection Attributes for Adabas).

    The CREATE SYNONYM facility will place the FILENO, DBNO, and CONNECTION Access File attributes in parameterized form with default values that were provided when the synonym was created.

    These values can be changed later with a FOCEXEC by using a -SET command.For example:

    -SET &&ADA_CONNECTION=ADA814;  
    -SET &&ADA_DBNO=123;  
    -SET &&ADA_FILNO=1234; 

    Access and Master Files created in previous versions can be used without any changes, except in the case where legacy files are going to be used to access Adabas databases with different SVCs . In those cases, the new CONNECTION attribute has to be placed into the old Access File, as shown in example above and the value of &&ADA_CONNECTION must correspond to the Connection Name from the connection string in server profile.

    If CONNECTION is not found among the connection strings, the adapterwill issue error message FOC4515.


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