Query data exceptions due to inconsistent MongoDB data

I see the state of the query here is 0, the previous data of the state is not 1, the solution is to repair the data.

Db.repairdatabase ()

As for the reasons for inconsistent data, I am not very clear, after a variety of information query

May be in the program, the linked database is not operating in Safe mode database

The following is a database of linked database operations in Safe mode

Mongoclient client = new Mongoclient (); Client.setwriteconcern (Writeconcern.safe);

Query data exceptions due to inconsistent MongoDB data