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Explanation of Thomas write rule

  •  It is timestamp-based concurrency control
  • It states that, if a more recent transaction has already written the value of an object, then a less recent transaction does not need perform its own write since it will eventually be overwritten by the more recent one.
  • Label each value with a write timestamp (WTS)
  • WTS indicates the timestamp of the last transaction to modify the value.
  • If the write timestamp of the object is greater than the time stamp of the transaction performing a write,, the write is discarded
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