MongoDB测量所需的磁盘大小

Question

我想知道是否有一些“经验法则”有一个近似的公式来衡量存储文件知道平均大小和文档数量需要多少，以及如果我创建一个或多个索引，这个增加多少文件。

Answer 1

There is but it would involve knowing what kind of indexes you specify and so forth. If you know the average document size and the resulting padding factor than you know your data size. Add index sizes (roughly the cumulative size of all values of all index fields plus ~20 bytes per document) and journaling files if enabled. Then round up to the nearest 2Gb (or up to the nearest 0.5Gb if --smallfiles option is enabled).

It's a lot easier to extrapolate if you have real-life data since storage space goes up pretty much linearly as you add more, roughly similar data.