MongoDB Architecture Chapter

First, copy set

1. Replica the schema of the set
2. Deployment of Replica Set
3. Master-Slave operation Log
   1. Inside the Local Database: Db.oplog.rs.find ()
   2. Basic information for the log: Db.printreplicationinfo ()
   3. View slave's presentation status: Db.printslavereplicationinfo ()
   4. Master/Slave configuration information: Db.system.replset.find ()
4. Managing replica Set
   1. Master-Slave switching

1 Frozen instances do not participate in primary elections: Rs.freeze (30)

2 downgrade: Rs.stepdown (30)

1. Read/write separation

1 Make slave readable: db.getMongo.setSlaveOk ()

1. Failover: Kill Process
2. Add or Subtract nodes

1 Add node: Rs.add ("localhost:27017")

2 Reduction node: Rs.remove ("localhost:27017")

Second, The Shard

1. sharding Introduction
   1. Features of Sharding

1 extensibility

2 increasing the high availability of databases

3 Pressure separation

1. Architecture of the Sharding

1 sharding Server: Each database server that stores shards.

2 Configuration Server: Node configuration information, chunk Shard key range, distribution, configuration information.

3 Routing Process: forwarding

1. The construction of sharding cluster
2. Maintenance of Sharding
   1. List all sharding Server:db.runCommand ({listshards:1})
   2. View Sharding's information: Printshardingstatus ()
   3. Determine if it is Sharding:db.runCommand ({isdbgrid:1})
   4. Sharding:db.runCommand the table ({shardcollection: "Ken.ken", Key:{_id:1}})
   5. New Sharding Server:db.runCommand ({addshard:locahost:27020})
   6. Remove Sharding Server:db.runCommand ({remove:localhost:27020})

Third, Replica sets+sharding architecture

1. Combine replication sets and sharding machines

MongoDB Architecture Chapter