Find a Shard Key找到分片键

To find the shard key of an existing sharded collection, use the db.printShardingStatus() method:要查找现有分片集合的分片键，请使用db.printShardingStatus()方法：

db.printShardingStatus()

For details on the db.printShardingStatus() output, see sh.status().有关db.printShardingStatus()输出的详细信息，请参阅sh.status()。