Answer
Query cache caused severe contention and invalidation overhead under concurrency. MySQL 8 removed it for scalability reasons.
Quick Answer
MySQL 8 removed the query cache because it was a bottleneck under high concurrency (global mutex lock on every query/invalidation). The cache was invalidated on any write to the table - making it useless for write-heavy tables. Modern applications use application-level caching (Redis, Memcached) which is far more effective, scalable, and controllable. The query cache removal was the right call.
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