–备份单个表
mongodump-u superuser-p123456–port 27017 –authenticationDatabase admin -d myTest -c d -o /backup/mongodb/myTest_d_bak_201507021701.bak
–备份单个库
mongodump-u superuser-p123456–port 27017 –authenticationDatabase admin -d myTest -o /backup/mongodb/