Recommended deployments in AEM6

URL:
https://helpx.adobe.com/experience-manager/6-4/sites/deploying/using/recommended-deploys.html

Note:

MongoDB is third-party software and is not included in the AEM licensing package. For more information see the MongoDB licensing policy page.

In order to get the most of your AEM deployment, Adobe recommends licensing the MongoDB Enterprise version in order to benefit from professional support.

The license includes a standard replica set, which is composed of one primary and two secondary instances that can be used for either the author or the publish deployments.

In case you wish to run both author and publish on MongoDB, two separate licenses need to be purchased.

For more information, see the MongoDB for Adobe Experience Manager page.