Answer
MVCC gives each transaction a snapshot of the database. PostgreSQL stores multiple row versions with transaction IDs, allowing readers and writers to work without blocking each other.
Quick Answer
MVCC (Multi-Version Concurrency Control) lets readers and writers proceed concurrently without blocking each other. When a row is updated, PostgreSQL creates a new version (tuple) with a new transaction ID, keeping the old version for concurrent readers. Each transaction sees a consistent snapshot of the data as of when it started. No read locks needed - readers never block writers and vice versa.
S
SugharaIQ Editorial Team
Verified Answer
This answer has been peer-reviewed by industry experts holding senior engineering roles to ensure technical accuracy and relevance for modern interview standards.
Want to bookmark, take notes, or join discussions?
Sign in to access all features and personalize your learning experience.
Source: SugharaIQ