Source data set for data tables

The source data set must be a base VSAM KSDS, not an alternate index. However, updates made to the KSDS via an alternate index are reflected in a CICS®-maintained data table.

The VSAM definition of the KSDS supplies the values for maximum record length and key length.

For a user-maintained data table, the updates are not reflected in either the source data set or its alternate indexes. A user-maintained data table is entirely independent of its source data set after loading has completed.

Related concepts
Introduction to shared data tables
The concept of shared data tables
Description of data tables
Data table sharing environment
Data space for data tables
Global user exits for data tables
Benefits of shared data tables
Shared data table services and remote file access
How a data table is shared
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