CA Scheduler data sets are: Index (IXX), Data (ACH), and History (HST). These data sets are stored in CA Datacom (DBID=430).
The data sets percentage of utilization is found in the CA Scheduler started task log. Example:
CACM335I SCHD CA-DATACOM AREA ACH IS 05% FULL
CACM335I SCHD CA-DATACOM AREA HST IS 04% FULL
CACM335I SCHD CA-DATACOM AREA IXX IS 05% FULL
When a data set % utilization reaches the threshold set on the CAIJGEN command (WARNPCT=nn), message CACM335E is issued (instead of CACM335I), and is highlighted.
The following technical document explains how to expand the CA Scheduler data sets:
Procedures to expand the CA Scheduler Job Manageme - CA Knowledge