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While replica sets are typically used with multiple servers, starting with a Single Node Replica Set is a fantastic way to access advanced features like Transactions and Change Streams on your local machine.
Why Use a Single Node Replica Set?
A standalone MongoDB instance is simple, but it doesn't support some of the most powerful features required for modern app development. By configuring a single node as a replica set, you unlock the ability to use multi-document transactions, which are essential for maintaining data integrity in complex applications.
The Configuration Process
Setting this up is easy! All you need to do is tell MongoDB that this instance belongs to a set. You do this by adding the --replSet flag when you start your mongod process from the command line, or by adding the replication setting to your configuration file.
Initiating the Set
After starting MongoDB with the replication flag, the final step is to initialize the set. Using the MongoDB Shell, you simply run the command rs.initiate(). This transforms your standard instance into the Primary node of your brand-new (single-member) replica set!
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