摘要:
PDF MySQL Optimizer Overview # Logical transformations: - Outer to inner joins transformation. - Negation elimination. ##### 否认消除 not ( t1.a > 10 OR t 阅读全文
摘要:
MySQL Cost-Based Optimizer 模型 MySQL Cost_estimate 定义了多种消耗类型 1. io_cost cost of I/O operations IO操作消耗2. cpu_cost cost of CPU operations CPU操作消耗3. impor 阅读全文