TroubleshootingInitial

High Cache Miss Rate

Diagnose and fix high cache miss rates

Cache hit rate below expected threshold

Database queries not being cached

TTL expiring too quickly

Check cache metrics:

CacheMetrics metrics = cacheService.getMetrics();
log.info("Hit rate: {}%", metrics.getHitRate() * 100);

Verify cache keys are consistent:

// Bad: Different key each time
cache.get("user:" + user.hashCode());

// Good: Consistent key
cache.get("user:" + user.getId());

TTL too short - Increase TTL for stable data

Key collisions - Use unique, consistent keys

Memory pressure - Increase cache size or use eviction policy

Serialization issues - Ensure objects are serializable

High-performance caching for qqq applications with Redis and in-memory support.