Utility Functions › VSAM Utility › Data Set Information – VSAM Linear Data Set › Field Descriptions

Field Descriptions

Data Set Definition:

Share options

Cross-Region – The first of the two numbers displayed that indicates how the file can be shared among regions within the same system or within multiple systems using GRS. The meaning of each value is:

1. The data set can be opened for read processing by an unlimited number of users, but the data set can be accessed by only one user when that user is doing read and write processing.
2. The data set can be opened by only one user at a time for read and write processing, but any number of users can also be accessing for read processing.
3. The data set can be fully shared by any number of users.
4. The data set can be fully shared by any number of users. VSAM immediately updates the data set for PUTs and refreshes all input buffers for GETs.

Cross-System – The second of the two numbers that indicates how the file can be shared among systems. The meaning of each value is:

The data set can be fully shared by any number of users.

The data set can be fully shared by any number of users. VSAM immediately updates the data set for PUTs and refreshes all input buffers for GETs.

Buffer space

Contains the minimum buffer space to be allocated when this VSAM file is accessed.

SMS Information:

Storage Class

When the VSAM file is SMS managed this field displays its SMS Storage Class.

Data Class

When the VSAM file is SMS managed this field displays its SMS Data Class.

Management Class

When the VSAM file is SMS managed this field displays its SMS Management Class.

Activity Dates:

Creation date

Date in CCYY/MM/DD format when the VSAM file was allocated.

Expiration date

If an expiration date was specified to the VSAM allocation, this is the date in CCYY/MM/DD after which the VSAM cluster can be deleted.

Component Allocation:

Control Interval size

The size of the control interval.

Allocation unit

'TRKS' or 'CYLS' to indicate whether the primary and secondary allocations are allocated in tracks or cylinders.

Primary allocation

The number of tracks or cylinders, depending on the allocation units, in the primary allocation of each volume.

Secondary allocation

The number of tracks or cylinders, depending on the allocation units, in each secondary allocation of each volume.

Extents Used

Total number of extents used for VSAM file component.

Allocation Parameters:

Specifies whether the VSAM file was allocated with various parameters that effect the functioning of the VSAM file.

Load restartable

Indicates whether the VSAM file was allocated with the RECOVERY parameter causing the data component to be preformatted previous to the initial load, or the SPEED parameter which does not. The use of the RECOVERY parameter causes the initial load to take longer, but loads that do not complete successfully can be restarted.

Write check

Indicates whether the VSAM file was allocated with the WRITECHECK parameter which requests each write to the VSAM file to be validated by a read without data transfer.

Erase on delete

Indicates whether the VSAM file was allocated with the ERASE parameter which causes all components of the file to be overwritten with binary zeros when the VSAM file is deleted from the catalog.

Reuse option

Indicates whether the VSAM file was allocated with the REUSE parameter that specifies the cluster can be opened again and again as a reusable cluster.