ILE RPG input/output operations

 

Be aware of these restrictions when accessing remote VSAM data sets.

• Records can be read or added by relative record number only when the remote VSAM data set is an RRDS. Random processing by relative record number can be used only when processing a VSAM RRDS.

• A request to delete a record in an ESDS does not work because ESDS is never delete-capable.

• The processing method cannot use the update or output specification in column 15 when the remote VSAM data set is a VSAM path. Instead, all add, update, or delete record requests must be made by using the base data set of the VSAM path. However, if the base data set of the VSAM path is a VSAM ESDS, the DELETE does not work.

• The READP operation code cannot be used to read the previous record in a VSAM path.

• Because VSAM KSDS does not allow duplicate keys, a request to add a record that duplicates the key of an existing record in a KSDS does not work.

• When accessing a KSDS, an update request that changes the key value of the record does not work.

• For ILE RPG programming language, *HIVAL can be used to obtain the last record of a remote KSDS. However, *HIVAL does not work when accessing a VSAM path.

 

Parent topic:

ILE RPG considerations