By default, Db2 assigns values to certain attributes of Db2 objects. When CDL is generated by comparing a DDL file to another data structure, Compare uses those system defaults if the attributes are not included in the DDL. In a production environment, however, these defaults might not be acceptable. When you evaluate the CDL statements, you should be aware of situations in which you have modified your system to use values other than Db2 defaults and situations in which Compare used a default value. To make or suppress changes to the data structures, you can apply the change rules or apply suppress-type change rules in an outbound migrate profile.