Distributed Databases
A distributed database (DDB) is
- collection of multiple logically-related databases
- distributed over a network (generally a WAN)
A distributed database management system (DDBMS) is
- software that manages a distributed database
- providing access that hides complexity of distribution
A DDBMS may involve
- instances of a single DBMS (e.g. ≥1 PostgreSQL servers)
- a layer over multiple different DBMSs (e.g. Oracle+PostgreSQL+DB2)
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