-delete 

You can use this option to delete statistics for one or more tablespaces or for a particular table.

Input syntax: -delete <tablespace(s)>|<table>

You can also delete statistics that are not required by the cost-based optimizer, or that are harmful (pooled and cluster tables, tables with Active = n or R in DBSTATC ).

Input syntax: -delete HARMFUL

-checkopt

Support for the Cost-Based Optimizer

SAPDBA: DB Optimizer Control

CCMS Support for the Cost-Based Optimizer