Dealing With Heterogeneity

• Hardware platform . . . . .

• Operating system . . . . . .

• Programming language . .

• Database system model . .

• Database system . . . . . . .

• Coverage . . . . . . . . . . . . . .

  • Attributes
  • Scope

• Data representation . . . . .

Hidden by operating system

Choices are reducing: POSIX

Fewer choices

Irrelevant in remote access

Relational and E-R common

Standards, convergence

Source dependent

documented, additive

undocumented, intersecting

Conversion problems, nulls

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