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InComputer Science, in the field ofdatabases,non-lock concurrency control is aconcurrency control method used inrelational databases without usinglocking.

There are several non-lock concurrency control methods, which involve the use of timestamps on transaction to determine transaction priority:

• Optimistic concurrency control
  • Timestamp-based concurrency control^[1]
  • Validation-based concurrency control
  • Multiversion concurrency control
    • Snapshot isolation

• Concurrency pattern
• InterBase
• Lock-free and wait-free algorithms

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