PPT Slide

State of OODBMSs (con’t)

• major problem -- lack of agreement
  • ODMG “standard” dating to 1993

• no support of view facility

• schema evolution not simple
  • tight coupling <> OODB and application language

• emergence of ODBC <> apps and relational DBs
  • reduce impedance mismatch
  • reduce need for OODBs

• typical commercial products (GemStone, ObjectStore)
  • queries => selections from instances of collection types
  • result of query can also be queried

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