Answer
VACUUM removes dead tuples, reclaims storage, improves performance, and prevents transaction ID wraparound.
Quick Answer
VACUUM reclaims storage from dead tuples created by PostgreSQL's MVCC - rows that were deleted or updated but not yet physically removed. Dead tuples occupy space and slow down queries. VACUUM marks space as reusable (doesn't shrink file). VACUUM ANALYZE also updates query planner statistics. Autovacuum runs automatically. Run manually if autovacuum is falling behind on high-traffic tables.
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