Deploying the .NET Search Interface URL Shortener Database
You can install MongoDB on any server that is accessible to your Coveo .NET Front-End server(s). MongoDB and its usage by the Coveo Platform require low computer resources.
In the case of a one server Coveo instance, installing MongoDB on the Coveo server is the simplest solution.
In the case of a Coveo instance with multiple Coveo .NET Front-End servers, you could choose to install MongoDB on the Coveo Master server, on one of the Coveo Front-End server, or on another server.
To deploy the URL shortener database
Install MongoDB on a server of your choice (see Installing MongoDB on a Server).
Note: You can achieve MongoDB high availability by installing MongoDB on three or more servers and configure a replica set (see the MongoDB document Replica Sets - Basics).
On each Coveo Front-End server, activate the URL shortener (see Enabling the URL Shortener Database).