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数据库怎么让并发的读者和写者互不妨碍、怎么承诺一次提交之后断电也不丢、怎么在几亿行里用几次读页找到一行——以及这一切在最底层如何被磁盘的块大小与随机 IOPS 定价。
本组：mvcc 管读写分离，isolation-levels 管这份分离按什么契约出售，wal 管持久性，b-tree 管找行，io-block-size-and-iops 管以上一切都要面对的价目表。
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