NCL VSAM Techniques › Initialization and ACB Open Processing › Automatic Verification and Loading › For Entry-Sequence Data Sets (ESDS)

For Entry-Sequence Data Sets (ESDS)

For an ESDS a single record in the following format is loaded:

N28510 VSAM INITIAL LOAD PERFORMED AT hh.mm.ss
ON day-dd.mon.year

This initial load record remains in the ESDS and if necessary can be skipped during offline processing by using the IDCAMS utility to REPRO the data set specifying the SKIP=1 operand.

Note: This load process is performed only if the data set is classified by VSAM as being empty. This implies that the high-order RBA is 0. If data exists within the data set when it is opened, then the load process is bypassed.

In a z/OS environment, where output is sent directly to JES2 or JES3, no load processing is required and hence the N28510 message is not the first record in the file.

If the load fails, the data set is classified as unusable and is blocked from further processing until the problem is corrected. The SHOW UDB command can be used to determine the current status of a UDB and displays any error code detected during open processing. If necessary, the data set in a z/OS environment can be de-allocated using the DEALLOC command to assist in offline correction of problems.