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Storage Technology (cont)

Persistent storage is
  • large, cheap, relatively slow, accessed in blocks
  • used for long-term storage of data
Computational storage is
  • small, expensive, fast, accessed by byte/word
  • used for all analysis of data
Access cost HDD:RAM ≅ 100000:1, e.g.
  • 100ms to read block containing two tuples
  • 1µs to compare fields in two tuples