rs0:PRIMARY> use imooc 
switched to db imooc 
rs0:PRIMARY> db.imooc.insert({"name":"imooc"}) 
WriteResult({ "nInserted" : 1 }) 
 

rs0:SECONDARY> use imooc 
switched to db imooc 
rs0:SECONDARY> show tables 
2017-06-14T19:33:06.118+0800 E QUERY  [thread1] Error: listCollections failed: { "ok" : 0, "errmsg" : "not master and slaveOk=false", "code" : 13435 } : 
_getErrorWithCode@src/mongo/shell/utils.js:25:13 
DB.prototype._getCollectionInfosCommand@src/mongo/shell/db.js:773:1 
DB.prototype.getCollectionInfos@src/mongo/shell/db.js:785:19 
DB.prototype.getCollectionNames@src/mongo/shell/db.js:796:16 
shellHelper.show@src/mongo/shell/utils.js:754:9 
shellHelper@src/mongo/shell/utils.js:651:15 
@(shellhelp2):1:1 
rs0:SECONDARY> rs.slaveOk() 
rs0:SECONDARY> show tables 
imooc 
rs0:SECONDARY> db.imooc.find() 
{ "_id" : ObjectId("59411e1c925a4f4db145e9af"), "name" : "imooc" } 
rs0:SECONDARY>