一些常见术语

读放大:

Read amplification is the number of I/O’s required to satisfy a particular query

一个查询所需要的io数

写放大:

Write amplification (WA) is an undesirable phenomenon associated with flash memory and solid-state drives (SSDs) where the actual amount of information physically written to the storage media is a multiple of the logical amount intended to be written.

也就是实际写入的内容大于我们想写的东西

空间放大

Space-amp is the ratio of the size of the database to the size of the data in the database.

实际数据集大小和数据的比率