Modifying Function Options › Identifying Standard Function Options › Distributed File I/O Control

Distributed File I/O Control

This option specifies the kind of I/O control to generate for the function. This enables you to use DRDA to access files on multiple remote relational databases (RDBs). This option only applies if the function is generated using SQL or DDL for the Generation Mode.

Note: SQL access can be used in Generation Mode even if the access paths are generated using DDS.

• If S is specified (Synon Control), DRDA is used. The function is driven by the configuration entries (RDBs) of the function’s default Retrieval access path. The table of the distributed files is created by executing the YCVTDSTFIL command. The configuration entries are added/modified using the YWRKDSTFIL command.

  Note: Synon Control is not applicable for Print files and Execute External functions. When Synon Control is specified for these two functions, User Control is used.

• If U is specified, (User Control), DRDA is used. The function contains distributed functionality/ capabilities but is not automatically driven by the configuration table entries. The initial relational database that the application is connected to are the current relational database unless overridden by action diagram logic that modifies the PGM context field *Next relational database.

  This field can be used within Synon Control to override the default processing.

• If N is specified, do not generate any distributed functionality for this function. This is equivalent to *NONE for the YDSTFIO model value.
• If M is specified, use the value of the YDSTFIO model value to determine the type of distribution I/O control access. Valid model values for YDSTFIO are *NONE, *USER, and *SYNON.

For more information on DRDA, see Generating and Implementing Applications in the chapter "Distributed Relational Database Architecture."