[Phase 9] Query Caching - Prepared Statements & Results

[ravituringworks]

Phase 9: Query Optimization & Performance

Overview

Implement comprehensive query caching system including prepared statement caching and result caching.

Features to Implement

• Prepared statement compilation and caching
• Query result caching with TTL and invalidation
• Query plan caching for repeated queries
• Parameter binding for prepared statements
• Cache eviction policies (LRU, LFU, TTL)
• Cache hit/miss metrics and monitoring

Technical Requirements

• Memory-efficient caching data structures
• Thread-safe cache implementations
• Query normalization for effective caching
• Cache invalidation on data changes
• Configurable cache sizes and policies
• Integration with PostgreSQL wire protocol

Success Criteria

• Prepared statement support with significant performance gains
• Query result caching for read-heavy workloads
• Cache hit rates of 70%+ for repeated queries
• Automatic cache invalidation on data modifications
• Configurable caching policies and limits
• Comprehensive cache metrics and monitoring

Dependencies

• Requires Query Planner for plan caching
• Integration with PostgreSQL wire protocol
• Connection with existing SQL executor

Estimated Effort

3-4 weeks