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.
Connection has no problem, but only there is no collection I created before. Db is saved in default path.
I am not sure what to do. Please help me.