Grokking Database Fundamentals for Tech Interviews
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Multiversion Concurrency Control (MVCC)
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What is Multiversion Concurrency Control (MVCC)?

MVCC is a concurrency control mechanism used in databases to allow multiple transactions to operate on the same data simultaneously by maintaining multiple versions of data items. Instead of locking rows, MVCC creates a new version of a row whenever a write occurs, ensuring that:

  • Transactions can read consistent snapshots of the database.
  • Write operations do not block read operations.

How MVCC Works

  1. Data Versioning:

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