"Could not allocate space for object 'dbo.Event'" Exception during Content Platform Engine Upgrade

Symptom

CPE upgrade fails with the following exception:

2015-03-04T11:11:59.137 A82D95F9 ENG FNRCD0009E - ERROR ObjectStoreUpgrade(OS1) Asynchronous Event Task: encountered an exception. com.filenet.api.exception.EngineRuntimeException: FNRCD0009E: DB_ERROR: The database access failed with the following error: ErrorCode 1,105, Message 'Could not allocate space for object 'dbo.Event' in database 'db1' because the 'PRIMARY' filegroup is full. Create disk space by deleting unneeded files, dropping objects in the filegroup, adding additional files to the filegroup, or setting autogrowth on for existing files in the filegroup.' ObjectStore: "UCB", SQL: ""INSERT INTO dbo.Event (object_id, object_class_id, security_id, epoch_id, home_id, creator, create_date, modify_user, modify_date, source_object_id, source_object_class_id, status, serialized_source_object, query_text, version_series_id, lifecycle_change, element_name, audit_level, initiating_user, sequence_number, serialized_orig_object) SELECT object_id, object_class_id, security_id, epoch_id, home_id, creator, create_date, modify_user, modify_date, source_object_id, source_object_class_id, status, serialized_source_object, query_text, version_series_id, lifecycle_change, element_name, audit_level, initiating_user, sequence_number, serialized_orig_object FROM dbo.LegacyEvent WHERE object_id = ?"