What is the core idea of MVCC (Multi-Version Concurrency Control)?

Problem Statement

Explanation

MVCC keeps past versions long enough to serve a snapshot consistent with each transaction’s view. Readers do not wait for writers and vice versa in common cases. Engines must vacuum or purge dead versions to reclaim space and control index bloat.

Code Solution

SolutionRead Only

START TRANSACTION; -- snapshot is taken here
SELECT * FROM orders WHERE id=10;

Practice Sets

This question appears in the following practice sets:

Transactions, Isolation & Concurrency Control

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What is the core idea of MVCC (Multi-Version Concurrency Control)?

Problem Statement

Explanation

Code Solution

Practice Sets

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What is the core idea of MVCC (Multi-Version Concurrency Control)?

Problem Statement

Explanation

Code Solution

Practice Sets

Related Questions

Which SQL statement retrieves all columns and rows from a table named employees?

Which clause filters rows before aggregation and affects which rows are grouped?

What is the default sort order when ORDER BY is used without ASC or DESC?

Which construct is commonly used to paginate results in SQL engines like Postgres and MySQL?

Which predicate correctly checks for missing values in standard SQL?

More from SQL & Databases

Master Interviews
Anywhere, Anytime