In this chapter, you learned the basic configuration and concepts of the replication process and the replica set network. We talked about the basic type of members, including the primary, secondary, and arbiter members. Then, we learned about the oplog collection, which holds the database changes.

Then, we went through the different kinds of secondary members. Primary 0, hidden, and delayed members are different types of secondary members. Also, you can find a detailed description explaining each one with illustrated charts and diagrams.

Moreover, you learned about the arbiter nodes that don't store any data but vote in the election process for a new primary member.

In the next chapter, we will deploy a replica set network from scratch to provide a readily available MongoDB server.