mongodb rename database

db.copyDatabase("db_to_rename","db_renamed","localhost")
use db_to_rename
db.dropDatabase();
# Dump db to a local folder
mongodump mongodb://user:pwd@localhost/old_name -o ./dump 

# Restore the db with the new name
mongorestore mongodb://user:pwd@localhost -d new_name ./dump/old_name

# Then run these commands in your mongodb shell
use old_name
db.dropDatabase()