# Database Backend

ngSurvey can be run using any of the following databases as its backend. 

* [Microsoft SQL Server](https://docs.ngsurvey.com/installation-setup/installation/database-backend/microsoft-sql-server)
* [MySQL](https://docs.ngsurvey.com/installation-setup/installation/database-backend/oracle-mysql)
* [MariaDB](https://docs.ngsurvey.com/installation-setup/installation/database-backend/mariadb)
* [PostgreSQL](https://docs.ngsurvey.com/installation-setup/installation/database-backend/postgresql)

{% hint style="danger" %}
Once setup its  currently not possible to migrate an existing ngSurvey database from one database vendor to another database vendor.
{% endhint %}