Allowed Changes to Data Set Aggregate Items details the changes that can be made to data set aggregate items. An asterisk (*) refers to the explanatory note following the table.

Explanatory Note

The aggregate item can be initialized by performing a garbage collection on the target structure of the aggregate item. Assume the original DASDL description looks as follows:

D DATASET
 (D1   REAL;
  D2   ALPHA(10);
 );

And assume the new DASDL description looks as follows:

AG1 AGGREGATE (10) COUNT D2 NEQ "abcde";
AG2 AGGREGATE (S10) SUM (D1);
D DATASET
 (D1   REAL;
  D2   ALPHA (10);
 );

Then the following syntax initializes the aggregate items:

GENERATE <database name>;
GENERATE D CHECKAGGREGATE;