当我输入db.help()它返回DBmethods:db.addUser(username,password[,readOnly=false])db.auth(username,password)......db.printShardingStatus()......db.fsyncLock()flushdatatodiskandlockserverforbackupsdb.fsyncUnock()unlocksserverfollowingadb.fsyncLock()我想了解如何获得特定命令的更详细帮助。问题出在printShardingStatus上，因为它返回“要打印的bloc

在我的Java代码中进行分片后，我需要获取一个block列表。我的代码很简单，看起来像这样:Mongom=newMongo("localhost",27017);DBdb=m.getDB("admin");Objectcr=db.eval("db.printShardingStatus()",1);调用eval()返回错误:Exceptioninthread"main"com.mongodb.CommandResult$CommandFailure:commandfailed[$eval]:{"serverUsed":"localhost/127.0.0.1:27017","errno

MongoDB的db.printShardingStatus命令，当从mongos进程运行时，打印一些与可访问分区数据库的当前状态相对应的json。例如---ShardingStatus---shardingversion:{"_id":1,"version":3}shards:{"_id":"rs_a","host":"rs_a/host1:27018,host2:27018"}{"_id":"rs_b","host":"rs_b/host3:27018,host4:27018"}databases:{"_id":"admin","partitioned":false,"primar