mongodb中的分片和复制

Question

First of all, I'm a beginner in mongoDB so please be patient with me. I'm using windows and I created a simple database that contains 4 collections. When I'm dealing with mongoDB, I first run: mongod.exe --dbpath "Path To Data Folder" in a terminal and then I connect to the mongod using mongo.exe . What I'm supposed to do is to distribute the database along with its collections into shards and replica sets for supporting distributed queries.

I tried to use commands like sh.enableSharding("DATABASE NAME") but it didn't work. I then figured out that I need to run mongos instead of mongod, so I followed this: Sharding in MongoDB but unfortunately I didn't succeeded. I also did some research but it seems there is a lack of to-the-point guides on sharding and replication. So if you point me to the right direction, I would really appreciate it.

Answer 1

You can't enable sharding on a single database instance. You need to have at least 3 config server instances, two database (mongod) instances and a router instance (mongos). All of them should be running in the same time (ie don't close the terminals in which you started all your instances).

A good starting point for you is to read the sharding tutorial in Deploy a Sharded Cluster - MongoDB.org