_ert_database_internal.html.md.erb

If you want to use internal databases for your deployment, perform the following steps:

1. Select **Databases**.

1. Select one of the **Internal Databases** options:
  - **Internal Databases - MySQL - Percona XtraDB Cluster** uses [Percona Server](https://www.percona.com/software/mysql-database/percona-server) with TLS encryption between server cluster nodes.
  - **Internal Databases - MySQL - MariaDB Galera Cluster** uses [MariaDB](http://www.mariadb.org) with cluster nodes communicating over plaintext.
  <p class="note warning"><strong>WARNING</strong>: Changing existing internal databases from <strong>MySQL - MariaDB Galera Cluster</strong> to <strong>MySQL - Percona XtraDB Cluster</strong> migrates the databases after you click <strong>Apply Changes</strong>, causing temporary system downtime. See <a href="../opsguide/scaling-down-mysql.html#migrate">Migrate to TLS Communication</a> for details.</p>
   <%= image_tag("system-db-tls.png") %>

1. Click **Save**.