Separate entrynames can be defined for the cluster, its data component, and its index component. If no name is specified for the data or index component, a name is generated. When the cluster, data component, and index component are individually named, each can be addressed. The name for a VSAM dataset can include up to 44 alphanumeric characters.
A kilobyte or megabyte allocation resolves to either tracks or cylinders; record allocation resolves to tracks. If RECORDS are selected, the amount of space allocated is the minimum number of tracks that are required to contain the given number of records. Regardless of the allocation type, The CA control area size will be calculated based on the smaller of the two allocation quantities primary or secondary in the DEFINE command but not based on the allocation type. A CA is never greater than a single-cylinder, it might be less that is, some number of tracks , depending on the allocation amount and type used.
Secondary — Allocates an amount of space each time the cluster extends, as a secondary extent. Volumes are always allocated in the order specified. If there is not enough space on the volume, the allocation is not successful. I should do all this copy within a single step. Could you please provide sample JCL to achieve this. Back to top. Posted: Wed May 13, pm. Thanks frank. Hi, I ask the question, what is the big deal about a single step job when there are no savings,?
If copy 2 or copy 3 fail, you will need to rerun the entire job amd depending on the size of the files you are copying it could be a significant amount of time lost. Hi Gerry! The only big deal is, that there is a possibility to do it. Hi Umeysan, capisco, I learned that in Italy.
The actual optimum blocksize is picked by the system. Other valid options are. The default if the SDB parm is not specified is usually to copy the input blocksize. In this case, is edited and copied. The logical record length of the output data set is less than that of the input data set. It contains text in —byte records. The record delimiter is not stated here.
FIRSTGRP, which appears in the first eight positions of an input record, is defined as being the last record in the first group of records. The data in positions 80 through of each input record are moved into positions 60 through 80 of each corresponding output record. This example implies that the data in positions 60 through 79 of the input records in the first record group are no longer required; thus, the logical record length is shortened by 20 bytes. The data in the remaining positions within each input record are transferred directly to the output records, as specified in the second FIELD parameter.
The data in positions 90 through of each input record are moved into positions 70 through 80 of the output records. This example implies that the data in positions 70 through 89 of the input records from group 2 are no longer required; thus, the logical record length is shortened by 20 bytes.
It can also be used to compress a PDS in batch. The next example shows an entire PDS being copied to another. In the example, all the DCB except space comes from the input file. If the following input statements are used, instead of copying the whole PDS, the job will just copy the four selected members. You need to alter the file name from 'changeme' to your file, and change the space units in STEP2 to suit your needs. If you are really brave, you add a final step which deletes the changeme.
0コメント