Large, Autonomy É Heterogeneity

Large, Autonomy É Heterogeneity

• Hardware platform . . . . .
• Operating system . . . . . .

• Programming language . . .
• Database system model . .
• Database system . . . . . . .
• Coverage . . . . . . . . . . . . .
  • Attributes
  • Scope
  • Data representation . . . . .
  • Data semantics . . . . . . . . .

  Hidden by operating system

  Choices are reducing: NT, UNIX, ...

  Fewer choices

  Irrelevant in remote access

  Relational and E-R common

  Standards, convergence

  Source dependent

  documented, additive

  undocumented, intersecting

  Conversion problems, nulls

  Requires knowledge

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