Blocking Considerations
The fields of the input/output specific feedback in the INFDS and in most
cases the fields of the device specific feedback information section of the
INFDS, are not updated for each operation to the file in which the records
are blocked and unblocked. The feedback information is updated only when a
block of records is transferred between an RPG program and the operating system.
However, if you are doing blocked input on a data base file, the relative
record number and the key value in the data base feedback section of the INFDS
are updated:
- On every input/output operation, if the file is not affected by the presence of a POST operation in the program.
- Only after a POST for the file, if file is affected by a POST operation in the program.
You can obtain valid updated feedback information by using the CL command OVRDBF (Override with Database File) with SEQONLY(*NO) specified. If you use a file override command, the ILE RPG compiler does not block or unblock the records in the file.
For more information on blocking and unblocking of records in RPG see Rational Development Studio for i: ILE RPG Programmer's Guide.