# Create an Active-Active database













Active-Active databases store data across multiple regions and availability zones.  This improves scalability, performance, and availability, especially when compared to standalone databases. See [Active-Active Redis](http://redis.io/docs/latest/operate/rc/databases/configuration/active-active-redis) for more information.

To deploy Active-Active databases in Redis Cloud, you need a Redis Cloud Pro plan that enables Active-Active Redis and defines the regions for each copy of your databases.

Active-Active databases consist of multiple copies (also called _instances_) deployed to different regions throughout the world.

This reduces latency for local users and improves availability should a region fail.

Redis Cloud maintains consistency among instances in the background; that is, each copy eventually includes updates from every region.  As a result, memory limit and throughput increase.

## Create an Active-Active database



3. Select the type of [subscription](http://redis.io/docs/latest/operate/rc/subscriptions) you need. For this guide, select **Pro**. 

    

    
This guide shows how to create an Active-Active database with a new Pro subscription. If you already have an Active-Active subscription and want to add a database to it, see [Create a Pro database in an existing subscription](http://redis.io/docs/latest/operate/rc/databases/create-database/create-pro-database-existing). Active-Active subscriptions can host a maximum of 10 databases.
    
    

After you select **Pro**, the **Database settings** section will appear.



For this guide, select **Custom settings**. For an Active-Active database, you will need to: 

1. Set up the deployment options, including cloud vendor and region details for each instance.

2. Define the database size requirements.

3. Review your choices, provide payment details, and then create your databases.

The following sections provide more information.

### Set up deployment details

The **Setup** tab specifies general settings for your Redis deployment.



There are two sections on this tab:

- [General settings](#general-settings) include the cloud provider details and specific configuration options.
- [Advanced options](#advanced-options) define settings for high availability and security. Configurable settings vary according to cloud provider.

#### General settings {#general-settings}

Select **Active-Active (Multi-region)** to turn on Active-Active. 



When you enable Active-Active Redis, two regions are selected by default. Select the drop-down arrow to display a list of provider regions that support Active-Active databases.




Active-Active subscriptions on Redis Cloud are limited to a maximum of 10 regions.


Use the checkboxes in the list to select or remove regions.  The Search box lets you locate specific regions.

You can use a region's Remove button to remove it from the list.



#### Advanced options {#advanced-options}



In the **Advanced options** section, you can:
    
- Define CIDR addresses for each region in the **VPC configuration** section.

    Every CIDR should be unique to properly route network traffic between each Active-Active database instance and your consumer VPCs. The CIDR block regions should _not_ overlap between the Redis server and your app consumer VPCs. In addition, CIDR blocks should not overlap between cluster instances. 

    When all **Deployment CIDR** regions display a green checkmark, you're ready to continue.  

    

    Red exclamation marks indicate error conditions; the tooltip provides additional details.

     

- Set your [maintenance](http://redis.io/docs/latest/operate/rc/subscriptions/maintenance) settings in the **Maintenance windows** section. Select **Manual** if you want to set [manual maintenance windows](http://redis.io/docs/latest/operate/rc/subscriptions/maintenance/set-maintenance-windows).

When finished, choose **Continue** to determine your size requirements.



### Sizing tab

The **Sizing** tab helps you specify the database, memory, and throughput requirements for your subscription.



When you first visit the **Sizing** tab, there are no databases defined.  Select the **Add** button to create one.



This opens the **New Active-Active Redis Database** dialog, which lets you define the requirements for your new database.



By default, you're shown basic settings, which include:

- **Name**: A custom name for your database.
- **Version**: The Redis version for your database. We recommend you choose the latest available version. 
- **Advanced Capabilities**: Advanced data types or features used by the database. Active-Active databases support the [JSON](http://redis.io/docs/latest/operate/oss_and_stack/stack-with-enterprise/json) data type and [Search and query](http://redis.io/docs/latest/operate/oss_and_stack/stack-with-enterprise/search) features.

      

    We select both capabilities for you automatically. You can remove a capability by selecting it. Selected capabilities will be available in all regions, including those added in the future.

    See [Search and query Active-Active databases](http://redis.io/docs/latest/operate/oss_and_stack/stack-with-enterprise/search/search-active-active) to learn how to use Search and query on Active-Active databases.

- **Dataset size**: The amount of data needed for your dataset in GB. 

    For Search and query databases, use the [Sizing calculator](http://redis.io/redisearch-sizing-calculator/) to estimate your index size and throughput requirements. When you're entering the dataset size for your database, add the estimated index size from the Sizing calculator to your expected dataset size.

- **Hashing policy**: Determines how data is distributed across multiple Redis processes of a database. Available options depend on your account creation date. See [Clustering](http://redis.io/docs/latest/operate/rc/databases/configuration/clustering#manage-the-hashing-policy) for more information.

- **Throughput**: When you create an Active-Active database, you define the throughput for each instance. The total operations per second combines the total read ops/sec and applies the write ops/sec for each region across every region. 

    
    
    Because each instance needs the ability to write to every other instance, write operations significantly affect the total, as shown in the following table:

    | Number of regions | Read operations | Write operations | Total operations |
    |:-----------------:|:---------------:|:----------------:|:----------------:|
    | Two | 1,000 each | 1,000 each | 6,000
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    | Two | 1,500 each | 1,000 each | 7,000<br/>(3,000 reads; 4,000 writes) |
    | Two | 1,000 each | 1,500 each | 8,000<br/>(2,000 reads; 6,000 writes) |
    | Three | 1,000 each | 1,000 each | 12,000<br/>(3,000 reads; 9,000 writes) |

    For Search and query databases, the estimated throughput from the [Sizing calculator](http://redis.io/redisearch-sizing-calculator/) is the total amount of throughput you need. When setting throughput for your Active-Active database, use the total amount for each region and divide it depending on your read (query) and write (update) needs for each region. For example, if the total amount of throughput needed is 50000 ops/sec, you could set each region to have 20000 ops/sec for reads (queries) and 30000 ops/sec for writes (updates).

- **Data Persistence**: Defines the data persistence policy, if any. See [Database persistence](http://redis.io/docs/latest/operate/rs/databases/configure/database-persistence.md).
- **Supported Protocol(s)**: Choose between RESP2 and RESP3 _(Redis 7.2 only)_. See [Redis serialization protocol](http://redis.io/docs/latest/develop/reference/protocol-spec#resp-versions) for details.
- **Quantity**: Number of databases to create with these settings. 

When finished, select **Save configuration** to save your database configuration.



Use the **Add database** button to define additional databases or select the **Continue button** to display the **Review and create** tab.

Hover over a database to see the **Edit** and **Delete** icons. You can use the **Edit** icon to change a database or the **Delete** icon to remove a database from the list.




### Review and Create tab

The **Review and Create** tab provides a cost estimate for your Redis Cloud Pro plan:



Redis breaks down your databases to Redis Billing Units (RBUs), each with their own size and throughput requirements. For more info, see [Billing unit types](http://redis.io/docs/latest/operate/rc/databases/create-database/create-pro-database-new#billing-unit-types).

The **Payment methods** section of this tab shows which payment method you're using for this database. Select the arrow on the top right of this section to view all available payment methods.



If you have not added a payment method or want to add a new payment method, select **Add credit card** to add a new credit card.



Select **Back to Sizing** to make changes or **Confirm & Pay** to create your databases.



Note that databases are created in the background.  While they are provisioning, you aren't allowed to make changes. This process generally takes 10-15 minutes.

Use the **Database list** to check the status of your databases.

## More info

- [Create a Pro database with a new subscription](http://redis.io/docs/latest/operate/rc/databases/create-database/create-pro-database-new)
- [Active-Active Redis](http://redis.io/docs/latest/operate/rc/databases/configuration/active-active-redis)
- [Develop applications with Active-Active databases](http://redis.io/docs/latest/operate/rs/databases/active-active/develop/_index.md)
- Database [memory limit](http://redis.io/docs/latest/operate/rc/databases/configuration/sizing#dataset-size)
- Redis Cloud [subscription plans](http://redis.io/docs/latest/operate/rc/subscriptions/)
- [Redis Cloud pricing](http://redis.io/pricing/#monthly)