Full details of platforms are available in the current SDM Technical Specification. Supported versions and configurations are available in the current SDM Technical Specification. Performance details are available in the current SDM Technical Specification. Much of the power and flexibility of the SDM stems from the extended relational data model. Unlike most spatial data processing systems, SDM allows considerable variation in schema for a database, so that the database design can be moulded to the application.
Database size has minimal effect on retrieval times.
This includes data security, data integrity, concurrency and locking, transaction recovery, journalling, backup and restoration. Assurance of rigorous geometric and referential integrity for spatial data types.