The statistics of mongodb after import and before export are different

Question

This is the analysis before exporting on windows:

Then the result after importing on mac:

Why are the statistical data before and after import inconsistent?

Answer 1

1, the number of records is consistent;

2, other statistical information is inconsistent, may be:

1）由于操作系统的文件系统不一样造成的。
2）mac上MongoDB用的WT存储引擎。

For reference.

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