How can I tell how big my VSAM file is?
So the file size may be = (rec len x no. of records)/bytes per cylinder.
What is record size in VSAM?
The record length is a value from 1 to 32,767. f. In the Key length field, type the length of the primary key by which records in a KSDS file are retrieved. The key length is a value from 1 to 255 bytes.
What parameter values are mandatory for VSAM datasets?
When defining a VSAM volume data set (VVDS), the entryname for the cluster or the data component must be in the form SYS1….The CA area size assigned by VSAM is the smallest of:
- One cylinder.
- The primary space quantity.
- The secondary space quantity.
How do I Recatalog a VSAM dataset?
To successfully recatalog a data set or VSAM object, you generally must supply the entry’s name, volume, and any ownership, protection, or expiration attributes defined for the entry. Occasionally, you might need to specify the space attribute, and the data set organization.
What is repro replace in VSAM?
The REPRO command copies the contents of one data set to another. Load a VSAM data set to a VSAM data set, optionally replacing records that have the same primary key values as the input records. Copy a VSAM data set to a sequential data set.
How do you load a VSAM dataset with records?
REPRO command is used to load data 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. IDCAMS utility uses REPRO command to load the datasets.
What is the difference between VSAM file and flat file?
In VSAM files records are stored in control intervals where as in FLAT files records are stored in blocks. FLAT files are sequential read . VSAM files can sequential and random read. In VSAM acess is fast because of organization of records.
Which utility is used to catalog a dataset?
The IEHPROGM utility is used primarily to manage catalogs, rename data sets, and delete data sets. Most of the IEHPROGM functions are available through access method services (the IDCAMS utility), which is now the preferred utility for catalog and data set functions.
What is free space in VSAM?
FREESPACE. Freespace specifies the percentage of free space to reserve for the control intervals (CI) and control areas (CA) of the data component. The default value of this parameter is zero percentage.
What is the difference between replace and reuse?
Reuse and Replace are common to the Repro command. Replace controls the replacement of individual keyed records. Reuse controls the replacement of the entire dataset.
What is repro reuse?
When using REPRO, the REUSE attribute permits repeated backups to the same VSAM reusable target data set. To create a backup copy, define a data set, and use REPRO to copy the original reusable data set into the newly defined data set.
How to recatalog VSAM data sets and associations?
For SMS-managed data sets and all VSAM data sets and associations, BCS entries can be recataloged using the access method services DEFINE command with the RECATALOG option. If there is a BCS entry for the data set, first remove it using DELETE NOSCRATCH.
Can a BCS entry be recataloged in VSAM?
Data sets can only be recataloged into the catalog specified in the VVR/NVR unless they are pagespace, swapspace or SYS1 data sets. For SMS-managed data sets and all VSAM data sets and associations, BCS entries can be recataloged using the access method services DEFINE command with the RECATALOG option.
What is the function of a non VSAM catalog?
Non-VSAM datasets resides on both tape and direct access storage. Non-VSAM datasets may have entries in both master catalog and user catalogs. The main function of cataloging non-VSAM datasets is to retain unit and volume serial information.
When to use the repro command in VSAM?
• The REPRO command can be used to copy some or all of the records from a VSAM data set to either another VSAM data set or a sequential data set • The REPRO command can also be used to copy records from a sequential data set into a VSAM data set.