ORA-12039

Error: ORA-12039: unable to use local rollback segment "string"

Causa: A local rollback segment was specified in the CREATE MATERIALIZED VIEW command, but automatic refresh parameters were not specified. Therefore a refresh group was not created to automatically refresh the materialized view and the local rollback segment can't be registered for future use.

Acción: Either supply the automatic refresh parameters so that a refresh group will be created or do not specify a local rollback segment.