Defining a Read-Only Class

It is possible to define a persistent class whose objects can be opened but not saved or deleted. To do this, specify the READONLY parameter for the class as 1:

Parameter READONLY = 1;

This is only useful for cases where you have objects that are mapped to preexisting storage (such as existing globals or an external database). If you call the %Save() method on a read-only object, it will always return an error code.

Using Columnar Storage

Defining a Sharded Class