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mysql B+tree的树高和分叉个数 - tanic's blog
mysql的索引按照页来存储， 目前大多数操作系统，一个页的大小为16KB。拿主键索引树举例，1、如果主键为int 占4个字节， 一个指针（64位系统）占8个字节， 则根结点可存储16KB/（4+8） 约等于1300， 此时分叉数约为1300当树高为3时， 可存储数据条数 1300^3 =21970000002、如果主键为bigint 占8个字节， 一个指针（64位系统）占8个字节， 则根结点可存
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