Dynamic Schema

• What happens when the database schema itself changes with time ?

  • Some comparisons become inexpressible
  • No problem with non-temporal OO GIS
  • Schema stored on classes, not object instances
  • No problem in principle: classes are objects
  • Schema evolution is a fact of life.

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24 hour x 365 days a year “up time” mean that the database must never go offline - but it must change to evolve and grow. Either a dynamic schema database, or some mechanism at the application/Corba level to move clients’ attachments to a new database with compatible interface at run-time which is running in mirror lock-step with the original...