# Mongodb – Where to insert data after sharding

mongodbsharding

1. Actual database in localhost:30000 ————- I used this as Shard1
2. another mongod in localhost:30001 ————- Shard2
3. another mongod in localhost:30002 ————- Shard3

Added 1 config server and Router pointing the configdb

Now in Router,

1. mongo admin
3. sh.enableSharding("myDatabasename in shard1")  //Enabled successfully
4. sh.shardCollection(...)                       //Shard Collection successfully


I checked each shards and I am able to see that it is split-ed in ascending order like

shard key starting with A-D in shard2 as chunk 1
shard key starting with E-H in shard3 as chunk 1
shard key starting with I-O in shard1 as chunk 1
shard key starting with P in shard1 as chunk 2               //had upto P only


Now I need to insert a new record means in which mongo instance I have to insert?

I tried in shard1 and inserted a new record with sharding key starting with E, which is getting inserted in shard1 itself whereas it has to be inserted in shard3.

With a sharded cluster, you need to insert data via a mongos process. A mongos process acts as a query router: it directs queries/updates to the appropriate shard(s) based on the current cluster configuration and metadata. Typically you deploy one mongos per application server.