Replication Overview

In this video we are discussing replication overview

Replication means keeping multiple instances of the same data. Replication has only one disadvantage

That means if we want to store the same data into multiple locations in the multiple storage spaces

then obviously we require a huge storage. Obviously, nowadays the storage cost has got reduced to a very nice extent

So, that's why we can easily sacrifice that one. but this replication is having manifold advantages

So, if one data is getting lost or getting damaged or getting deleted from a certain

data source, we can access the same data from the multiple other locations where it got

replicated earlier. From the application, this replication will remain transparent. From the application, we cannot get the idea that this particular data from where we are

accessing to which other locations, the same data was replicated. replicated. So, replication enhances the availability probability and accessibility probability

So, that's why more availability and more data access will be obtained if you go for

data replication. So, let us go for some further discussion on this replication overview

So, what is replication in MongoDB? So, replication is the process of synchronizing data

across multiple servers. The thing is that when a same data has got replicated

replicated into multiple different locations. If there is one update in any one of the instances

then that update must be synchronized with the other instances. Otherwise, the database will

become inconsistent. Replication provides redundancy and increases data availability with multiple copies of data on different database servers So we are having multiple different database servers where this particular data will get replicated Obviously it requires more storage space but obviously it will increase the more availability and more accessibility

Replication protects a database from the loss of single server and replication also allows you

to recover from the hardware failure, the service interruptions and so on. So data will not be lost

that we can ensure. So, with additional copies of the data, you can dedicate one of the

disasters recovery reporting or backup. So, this are the advantages of our replication

Why we should use replication? So, let us make one summary. So these are the points we have

made a summary so that you can understand better. The replication is used for some reasons

and the reasons are like below. The first one, to keep our data safe

So, safe means if one server is going down, then the data can be accessed from the other servers

Next one is a high, that is 24 into 7, availability of data

Disaster recovery. Next one is no downtime for maintenance, like the backups, index rebuilds, and compaction

We can access data from the other instances. So there is no downtime

downtime in this case. Next one is our read scaling, that is extra copies to read from

So depending upon the network concessions or depending on some other features and other problems

we can read our data from different sources as when available. So read scaling is getting

enhanced. Next one is the replica set is transparent to the application as I have mentioned

earlier. So, these are the different advantages we are going to enjoy if we do the replication

in our databases and MongoDB supports replication. Thanks for watching this video