PPT Slide

What About Object-Oriented DBMSs?

• OOPL + DBMS = OO-DBMS
  • Commonly based on C++ or Smalltalk
  • Persistence, collections, queries, versions, ...

• Lots of interesting and useful research results
  • O-O data models and query languages
  • O-O query processing, system architecture, performance
  • Various products (O2, Objectstore, Versant, Objectivity, ...)

• No widespread commercial acceptance
  • Many differences across systems (despite ODMG-93)
  • Never really caught up to RDBMS techology
    • Schema compilation, evolution painful
    • Missing many of the relational "goodies"
    • Single-language focus, lack of (relational) tools

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