How do I Recatalog a VSAM dataset?

How do I Recatalog a VSAM dataset?

To recatalog a data set or VSAM object using the DEFINE RECATALOG command, the corresponding entries in the VVDS and VTOC must exist. This information is used to rebuild the BCS entries, along with information supplied in the command.

How do I restore VSAM files?

Restoring VSAM data sets

  1. Predefine the data set on the target volume, using the proper allocation and control interval sizes.
  2. Reissue the RECOVER command to request the restore.

How do I clone a VSAM file?

Easiest way to copy an existing VSAM file to a new VSAM file is by using FILE-AID. Go to FILE-AID —> then go to option 3 —> From there again go to option 3 , which is FILE-AID COPY Utility. At this panel u have to supply FROM dataset info , which is ur old existing VSAM dataset.

What is repro replace in VSAM?

When using REPRO, the REPLACE parameter lets you merge a backup copy into the damaged data set. You cannot use the REPLACE parameter with entry-sequenced data sets, because records are always added to the end of an entry-sequenced data set.

What is reuse in VSAM?

The REUSE parameter lets you treat a filled data set as if it were empty and load it again and again regardless of its previous contents. A reusable data set can be a KSDS, an ESDS, an LDS, or a RRDS that resides on one or more volumes.

How do I update VSAM?

Open the VSAM file in update mode ( rb+/r+b , wb+/w+b , or ab+/a+b specified as the required positional parameter of the fopen() function call and type=record ). If the file is not already positioned at the record you want to update, reposition to that record. Read in the record using fread() .

Can we rewrite sequential file in Cobol?

The REWRITE statement is not supported for line-sequential files. Must be the name of a logical record in a data division FD entry.

What is the significance of reuse parameter in Repro?

How are the AMS commands in idcams specified?

The IDCAMS functional commands with all the right parameters are specified in the SYSIN DD part of the JCL as illustrated above. It can be specified in-stream or in a data set. All functional commands and their parameters must start in or after the second column and cannot extend beyond the 72nd column.

What are the types of VSAM catalog?

In following image you can see the type of VSAM catalogs − Master catalog is itself a file which monitors and manages operations of VSAM. Their is only one master catalog in any system which contains entries about system datasets and VSAM datasets. VSAM and Non-VSAM datasets may have entry in master catalog but this is not a good practice.

How do I recatalog a data set or VSAM object?

To recatalog a data set or VSAM object using the DEFINE RECATALOG command, the corresponding entries in the VVDS and VTOC must exist. This information is used to rebuild the BCS entries, along with information supplied in the command.

How to copy data from sequential file to VSAM file?

The AMS REPRO command is used for initial loading of records into VSAM dataset. It is also used to copy data from one VSAM data set to another. We can use this command to copy data from sequential file to VSAM file.

What is a sub-allocated VSAM file?

A sub-allocated VSAM file shares the VSAM space with other sub-allocated files. It specifies that file should be sub-allocated within existing VSAM space. Sub-allocation is used for easier management and control of VSAM spaces.