Mongodb database replication table

utilize foreach Method in shell Run directly inside

1, Copy the table of one instance to the table of another instance ( The same database )
db.collection_name.find().forEach(function(d){db.getSiblingDB('new_database')['collection_name'].insert(d);})
collection_name： Database table name
new_database： Target database

2, On the same host, the same db Next copy a table
db. Copy source table name .find().forEach(function(x){db. Destination table name .insert(x);})
Example ：
db.test.find().forEach(function(x){db.test_bak.insert(x);})