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innodb mysql oracle database crash recovery cache cpu buffer pool range query atomic rmw reordering mvcc query optimizer statistics cost join lock pin latch block page transaction lru dirty pages buffer header buffer checkpoint mutex postgresql group commit optimizer internal insert buffer data cache queueing theory little's law performance capacity planning erlang's formula memory ordering lock-free spinlock memory ordering 性能优化 功能增强 5.6 新特性 real application cluster rac ops cache-fusion pcm brain-split resource hardware hdd network ssd 硬件 memory log wal rollback segment flushing