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>