Understanding 2PC: What Does Two-Phase Commit Mean?

Learn what 2PC (Two-Phase Commit) means and how it ensures data integrity in distributed systems.

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2PC stands for Two-Phase Commit. It's a protocol used in distributed systems to ensure all participating databases agree on a transaction, guaranteeing consistency. It operates in two phases: the prepare phase, where resources prepare but do not commit, and the commit phase, where all resources finalize the transaction upon agreement. This ensures that either all changes are committed or none are, maintaining data integrity across systems.

FAQs & Answers

  1. What is the purpose of the Two-Phase Commit protocol? The Two-Phase Commit protocol ensures that all participating databases agree on a transaction, maintaining data integrity.
  2. How does the prepare phase work in 2PC? In the prepare phase of 2PC, resources prepare to commit but do not finalize any changes until agreement is reached.
  3. What happens if a participant fails during the Two-Phase Commit? If a participant fails during 2PC, the transaction may be rolled back to maintain consistency across all databases involved.

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