Database Reference
In-Depth Information
Summary
In this chapter, we studied how to create a replica set from scratch to provide a readily
available MongoDB server. First of all, we discussed the basic considerations of a replica
set. Next, we configured the workspace to run the replica set. Additionally, we learned ba-
sic replica set commands in order to add or remove members from the replica set.
In our example, we had a three-member replica set, one
primary
and two
secondary
nodes. After configuration and setup, to test the replica set, we deactivated different nodes
in the replica set. Also, we found that upon disabling the
primary
node, the replica set
will choose another
primary
node from the active secondary members using an election
process.
Also, we learned to run an
arbiter
node and add it to an existing replica set network. We
found that
arbiter
nodes won't save and hold data at all.
In the next chapter, we will learn sharding in MongoDB, and distributing a dataset into dif-
ferent servers and machines.
