What is MVCC (Multi-Version Concurrency Control) in PostgreSQL and how does it work?
MVCC in PostgreSQL is a critical feature that helps manage concurrency control in database operations. It allows multiple transactions to operate concurrently without causing consistency issues.
How MVCC Works:
MVCC creates multiple versions of each row to maintain a consistent view for each transaction. When a transaction updates a row, a new version of the row is created with a timestamp. Other transactions continue to access the old version until the new version is committed.
Significance of MVCC:
MVCC ensures that reading transactions are never blocked by writing transactions and vice versa, leading to better performance and scalability in PostgreSQL databases.
Key Takeaway:
Understanding MVCC in PostgreSQL is essential for optimizing database performance and maintaining data consistency in a multi-user environment.
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