Magento is compatible with Elastic Search/Suite. We do not support MySQL as a search engine:
Magento Apps
Compatibility
Elastic Search
Compatible
Elastic Suite
Not compatible
MySQL
Not compatible
PHP Requirements
The Nosto Magento 2 module requires at least PHP version >= 7.0.0 and Nosto's Magento 2 module >= 4.0.0
Installing the extension
Currently the only way of installing the module is via Composer. If you don't have composer installed yet you can get it by following these instructions. It's recommended to install composer globally. You will also need public key and private key from Magento Marketplace or Magento Connect in order to install packages to Magento 2 via Composer. Please follow these instructions to get public key and private key http://devdocs.magento.com/guides/v2.2/install-gde/prereq/connect-auth.html. Once you have composer installed you can install Nosto extension (nosto/module-nostotagging-cmp).
You might need to change file permissions or ownership of the generated files after the installation.
After running the commands above, you can log-in to the store admin. You will find settings for Category personalization and merchandizing module under Stores > Configuration > Services > Nosto CMP.