Multi-version Concurrency Control or MVCC is a technique to enhance database performance by handling concurrency in PostgreSQL databases. It prevents the locking of databases. MVCC reduces the delay time that users face while logging into their accounts and comes into action when someone else is accessing the contents of the account.
Inconsistency occurs when numerous transactions attempt to access the same data. To preserve data consistency, concurrency control is necessary.
Let’s take an example of an ATM machine. If concurrency is not applied in this case, different users won’t be able to access their accounts and draw money at the same time. Whereas if concurrency control is enabled, then multiple users can do so easily.