unique across time and space: uuids

Mon Mar 31 202522 views

Questions to answer in this blog:

  • what are uuids? They are unique identifiers.

    • They can be used in software systems to uniquely identify entitites.
    • 36 string characters and 128 bits
    • There are 5 versions of UUID + 1 common unofficial one
      • Version of UUID

  • What is the uuid algorithm? Don't know this. LEARN

  • Who made them?

  • Why does the uuid algorithm work?

  • What are some alternatives unique identifiers?

  • What is the algorithm to generate uuids?

  • Can I show this in pseudocode?

UUID format time-low "-" time-mid "-" time-high-and-version "-" (clock-seq-and-reserved + clock-seq-low) "-" node

time-low = 32 bits = 4hexOctets time-mid = 16bits = 2hexOctets time-high-and-version = 16bits = 2hexOctets clock-seq-and-reserved = 8bits = hexOctet clock-seq-low = 8bits = hexOctet node = 48bits = 6hexOctet

hexOctet = hexDigit + hexDigit

RFC 4122