Previous topic |
Next topic |
Contents |
Contact z/OS |
Library |
PDF
Tape-to-Disk Update—Direct Data Set z/OS DFSMS Using Data Sets SC23-6855-00 |
|
The example in Figure 1 is similar to that in Figure 1, but involves updating a record rather than adding one. Figure 1. Updating a Direct Data Set
There is no check for dummy records. The existing direct data set contains 25 000 records whose 5-byte keys range from 00 001 to 25 000. Each data record is 100 bytes long. The first 30 characters are to be updated. Each input tape record consists of a 5-byte key and a 30-byte data area. Notice that only data is brought into virtual storage for updating. When you are updating variable-length records, you should use the same length to read and write a record. |
Copyright IBM Corporation 1990, 2014
|