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# Working with databases¶

Your Drupal application’s database contains the application’s content, configuration, and log information. When you import or create an application in Acquia Cloud Platform, you have several environments you can use to develop and manage your application, with each environment having its own database allowing your application to have several databases associated with it, depending on which environment you are working in.

You can use the Environments page in the Acquia Cloud Platform user interface to copy a database from one of your application’s environments to another by dragging the database between environments. You can use the Application > Environments page to add, back up, delete databases, or restore and delete database backups.

Drupal sets up the application’s primary database when you install Drupal. Your application can also require more databases. You can create more databases by using the Acquia Cloud Platform interface.

Note for Acquia Cloud Platform CD environments

You cannot create more databases for Acquia Cloud Platform CD environments.

Alternatively, you can access a specific environment in your application, click Databases > Add Database.

2. Enter the database name, and click Add Database. Adding a database creates unique databases for each environment and adds a block for the database to the Databases page.

• If the database is for a new website using Drupal multisite, enter the website name. Then, add the include statement from the Databases page to the settings.php file in the multisite directory (for example, docroot/sites/[sitename]/settings.php). For more information, see About Drupal multisite installations.
• If the database is for added content for an existing application, enter a name (for example, for a postal code database, use “postalcodes”), and use db_set_active('[Database]') within Drupal to access it. Do not add the include statement from the Databases page to the settings.php file unless you intend the new database to be your application’s default Drupal database.

Note

• Database roles have a character limit of 62, and can include a-z, A-Z, 0-9, - (dash), and _ (underscore) characters. However, database roles cannot have a leading or trailing dash or underscore. In addition, you cannot use the . (dot) character.
• Database names can include a-z, A-Z, and 0-9. However, database names cannot include - (dash), _ (underscore), and . (dot) characters.

### Using many databases¶

Running a large number of databases in the same application can adversely affect the performance of the database infrastructure or the usability in the Acquia Cloud Platform user interface.

Note

Acquia Cloud Platform allows a maximum of 100 databases per subscription.

If you need a larger number of distinct databases, you must split your sites to run on several clusters. If you have any questions about your current database usage or the limits on your account, contact Acquia Support.

## Configuring your application to use environment databases¶

To the view the include statement, also known as the require statement) for your database, access a specific environment for your application, and click Databases > PHP. The include statement must be at the end of the settings.php file in your /sites directory, but must precede any other Acquia Cloud Platform-specific entries in settings.php, including Memcached configuration code or any code using Acquia Cloud Platform environment variables.

The database include statement causes your application to use a unique database for each environment allowing you to use the same settings.php file in each of your Acquia Cloud Platform environments.

When you use the Acquia Cloud Platform interface to install a Drupal distribution or import a website archive, or import an application using the Acquia Connector, Acquia Cloud Platform creates the database include statement in your settings.php file. Otherwise, you must edit the settings.php file yourself to add the include statement. Do not add the include statement unless you intend the new database to be your application’s default Drupal database.

## Copying a database across environments¶

As you develop your application, you may often want to update an environment with the version of the database from a different environment. Most commonly, you may want to update your Dev or Stage environment databases with the content and configuration from your Prod environment.

2. In the grid view, drag the source database container to the target environment you want to contain the database copy. For example, drag the Prod database to the Dev environment.

3. If the application has more than one database, select the database you want to copy, or click All to select all the databases.

4. Click Continue.

5. Click Copy to confirm you want to overwrite the target environment’s database with the source environment’s database. The database migration begins, and the existing database is dropped (drush sql-drop) during the copy process.

Important

After your application is live, Acquia does not recommend copying a database into the Production environment. Doing so may lead to content loss on your application. While the database is copying, requests which cannot be served from cache will fail.

You cannot copy a database to your Production environment when your application is in Production mode. For more information, see Using Production mode to protect your live application.

## Viewing database information¶

1. Access a specific environment in your application and click Databases.

2. If your environment has more than one database associated with it, click the name of the database you want to view.

3. Click Details to display the connection information for the database.

Acquia Cloud Platform displays the environment-agnostic database name at the top of the section, along with the following fields and their values:

• SSH Host: Fully-qualified domain name needed to SSH in to the environment
• MySQL Host: The hostname of the database infrastructure. It is only accessible after connecting to the SSH host.
• Name: Environment-specific name for the database

Note

Acquia Cloud Platform API users must use the database machine name for any script options.

The Databases page displays the date and time of the last created backup for each database in each environment. You can also create on-demand backups and view, download, restore, and delete backups. For more information, see Backing up your application.

## Deleting a database¶

You can use the Databases page to delete a database, so long as it is not your Drupal application’s primary database. You cannot delete the primary database for your application. Doing so would prevent your application from working.

Important

Ensure that you exercise caution before deleting a database as all environments associated with the database are impacted.

Note for Acquia Cloud Platform CD environments

You cannot delete databases from Acquia Cloud Platform CD environments.

To delete a database:

1. On the Databases page, locate the database that you want to delete and click Remove.

## Monitoring and accessing your databases¶

Acquia Cloud Platform provides several tools you can use to monitor and access your application’s databases: