Data set Open and Close activities
This report block of the Statistics trace report indicates whether enough data sets are allowed to be concurrently open.
DSETS CLOSED-THRESH.REACHED field value should be
close to zero. I not, use the ZPARM DSMAX to allow more open data sets. A
reasonable figure is 8 000 - 10 000.
Set the CLOSERULE parameter of the CREATE TABLESPACE, CREATE INDEX, ALTER TABLESPACE, and ALTER INDEX commands to YES for table spaces and indexes that are used mainly by batch applications, and to NO for those that are used mainly online.