'Mongodb database removed in Debian

I installed mongodb database following this guide https://www.mongodb.com/docs/manual/tutorial/install-mongodb-on-debian/ It worked a few hours or more. Suddenly 2 days later, I found there is no collection at all. I checked mongodb status, and its still active.

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Connection has no problem, but only there is no collection I created before. Db is saved in default path.

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I am not sure what to do. Please help me.



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