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
