rszhou:PRIMARY> show dbs
admin 0.000GB
local 146.588GB
db_chunqiu 1163.165GB

rszhou:PRIMARY>use db_chunqiu

rszhou:PRIMARY> db.dropDatabase()
{ "dropped" : "db_chunqiu", "ok" : 1 }
rszhou:PRIMARY> show dbs
admin 0.000GB
local 146.588GB