Classical DBMSs
Assumptions made in conventional DBMSs:
- data is sets of tuples; tuples are lists of atomic values
- data values can be compared precisely (via =, >, <, ...)
- filters can be described via boolean formulae
- SQL/PLpgSQL can handle all data manipulation
- transaction-based consistency is critical
- data stored on disk, processed in memory
- data transferred in blocks of many tuples
- disk ↔ memory cost is most expensive in system
- disks are connected to processors via fast local bus
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