The internal key of an instance is the text value of a reserved property @baseclass.pzInsKey. This property is defined in the ultimate base class and so is available in every class. This value is also known as the handle.
For rule instances, the date and
time that the rule was first saved is a portion of the internal
key. As a result, the pzInsKey property has no
value until the new rule instance is saved and committed.
When a database administrator creates a new table in the
PegaRULES database, it is important to include a database
constraint that identifies the pzInsKey column as
the primary key of the table.