| Class | IRequestExpired | A RequestExpired exception is raised if the current request has |
| Interface | ISQLBase | An extension of ISQLObject that provides an ID. |
| Interface | IDatabasePolicy | Implement database policy based on the request. |
| Class | MasterUnavailable | A master (writable replica) database was requested but not available. |
| Class | DisallowedStore | A request was made to access a Store that has been disabled |
| Interface | IStoreSelector | Get a Storm store with a desired flavor. |
| Interface | IStore | A storm.store.Store. |
| Interface | IMasterStore | A writeable Storm Stores. |
| Interface | ISlaveStore | A read-only Storm Store. |
| Interface | IDBObject | A Storm database object. |
| Interface | IMasterObject | A Storm database object associated with its master Store. |