相关疑难解决方法(0)

> db.oplog.rs.find({},{"ts":1}).sort({$natural: -1})
{ "ts" : Timestamp(1406185666, 1) }  
{ "ts" : Timestamp(1406180043, 1) }  
{ "ts" : Timestamp(1406180033, 1) }  
{ "ts" : Timestamp(1406172831, 1) }  
{ "ts" : Timestamp(1406171938, 1) }  
{ "ts" : Timestamp(1405915291, 1) }  
{ "ts" : Timestamp(1405915131, 1) }  
{ "ts" : Timestamp(1405915019, 1) }  
{ "ts" : Timestamp(1405914592, 1) }  
{ "ts" : Timestamp(1405914581, 1) }  
{ "ts" : Timestamp(1405587944, 1) }  
{ "ts" : Timestamp(1405587920, 1) }  
{ "ts" : Timestamp(1405587468, 1) …