Quotas and constraints for Amazon Aurora

Following, you can find a description of the resource quotas and naming constraints for Amazon Aurora.

Quotas in Amazon Aurora

Each AWS account has quotas, for each AWS Region, on the number of Amazon Aurora resources that can be created. After a quota for a resource has been reached, additional calls to create that resource fail with an exception.

The following table lists the resources and their quotas per AWS Region.

Name	Default	Adjustable	Description
Authorizations per DB security group	Each supported Region: 20	No	Number of security group authorizations per DB security group
Custom engine versions	Each supported Region: 40	Yes	The maximum number of custom engine versions allowed in this account in the current Region
DB cluster parameter groups	Each supported Region: 50	No	The maximum number of DB cluster parameter groups
DB clusters	Each supported Region: 40	Yes	The maximum number of Aurora clusters allowed in this account in the current Region
DB instances	Each supported Region: 40	Yes	The maximum number of DB instances allowed in this account in the current Region
DB subnet groups	Each supported Region: 50	Yes	The maximum number of DB subnet groups
Data API HTTP request body size	Each supported Region: 4 Megabytes	No	The maximum size allowed for the HTTP request body.
Data API maximum concurrent cluster-secret pairs	Each supported Region: 30	No	The maximum number of unique pairs of Aurora Serverless DB clusters and secrets in concurrent Data API requests for the current account and AWS Region.
Data API maximum concurrent requests	Each supported Region: 500	No	The maximum number of Data API requests to an Aurora Serverless DB cluster that use the same secret and can be processed at the same time. Additional requests are queued and processed as in-process requests complete.
Data API maximum result set size	Each supported Region: 1 Megabytes	No	The maximum size of the database result set that can be returned by the Data API.
Data API maximum size of JSON response string	Each supported Region: 10 Megabytes	No	The maximum size of the simplified JSON response string returned by the RDS Data API.
Data API requests per second	Each supported Region: 1,000 per second	No	The maximum number of requests to the Data API per second allowed in this account in the current AWS Region.
Event subscriptions	Each supported Region: 20	Yes	The maximum number of event subscriptions
IAM roles per DB cluster	Each supported Region: 5	Yes	The maximum number of IAM roles associated with a DB cluster
IAM roles per DB instance	Each supported Region: 5	Yes	The maximum number of IAM roles associated with a DB instance
Manual DB cluster snapshots	Each supported Region: 100	Yes	The maximum number of manual DB cluster snapshots
Manual DB instance snapshots	Each supported Region: 100	Yes	The maximum number of manual DB instance snapshots
Option groups	Each supported Region: 20	Yes	The maximum number of option groups
Parameter groups	Each supported Region: 50	Yes	The maximum number of parameter groups
Proxies	Each supported Region: 20	Yes	The maximum number of proxies allowed in this account in the current AWS Region
Read replicas per master	Each supported Region: 5	Yes	The maximum number of read replicas per master
Reserved DB instances	Each supported Region: 40	Yes	The maximum number of reserved DB instances allowed in this account in the current AWS Region
Rules per security group	Each supported Region: 20	No	The maximum number of rules per DB security group
Security groups	Each supported Region: 25	Yes	The maximum number of DB security groups
Security groups (VPC)	Each supported Region: 5	No	The maximum number of DB security groups per Amazon VPC
Subnets per DB subnet group	Each supported Region: 20	No	The maximum number of subnets per DB subnet group
Tags per resource	Each supported Region: 50	No	The maximum number of tags per Amazon RDS resource
Total storage for all DB instances	Each supported Region: 100,000 Gigabytes	Yes	The maximum total storage (in GB) for all DB instances added together

Note

The limits on total storage and number of read replicas don't apply to Aurora.

By default, you can have up to a total of 40 DB instances. RDS DB instances, Aurora DB instances, Amazon Neptune instances, and Amazon DocumentDB instances apply to this quota.

If your application requires more DB instances, you can request additional DB instances by opening the Service Quotas console. In the navigation pane, choose AWS services. Choose Amazon Relational Database Service (Amazon RDS), choose a quota, and follow the directions to request a quota increase. For more information, see Requesting a quota increase in the Service Quotas User Guide.

Backups managed by AWS Backup are considered manual DB cluster snapshots, but don't count toward the manual cluster snapshot quota. For information about AWS Backup, see the AWS Backup Developer Guide.

If you use any of the Amazon RDS APIs and exceed the default quota for the number of calls per second, the Amazon RDS API issues an error similar to the following: ClientError: An error occurred (ThrottlingException) when calling the API_name operation: Rate exceeded. Reduce the number of calls per second. The quota is meant to cover most use cases. If higher limits are needed, request a quota increase by contacting AWS Support. Open the AWS Support Center page, sign in if necessary, and choose Create case. Choose Service limit increase. Complete and submit the form.

Note

This quota can't be changed in the Amazon RDS Service Quotas console.

Naming constraints in Amazon Aurora

The following table describes naming constraints in Amazon Aurora.

Resource or item	Constraints
DB cluster identifier	Identifiers have these naming constraints: Must contain 1–63 alphanumeric characters or hyphens. First character must be a letter. Can't end with a hyphen or contain two consecutive hyphens. Must be unique for all DB instances per AWS account, per AWS Region.
Initial database name	Database name constraints differ between Aurora MySQL and PostgreSQL. For more information, see the available settings when creating each DB cluster.
Master user name	Master user name constraints differ for each database engine. For more information, see the available settings when creating each DB cluster.
Master password	The password for the database master user can include any printable ASCII character except /, ', ", @, or a space. Master password length constraints differ for each database engine. For more information, see the available settings when creating each DB cluster.
DB parameter group name	These names have these constraints: Must contain 1–255 alphanumeric characters. First character must be a letter. Hyphens are allowed, but the name cannot end with a hyphen or contain two consecutive hyphens.
DB subnet group name	These names have these constraints: Must contain 1–255 characters. Alphanumeric characters, spaces, hyphens, underscores, and periods are allowed.

Amazon Aurora size limits

Storage size limits

An Aurora cluster volume can grow to a maximum size of 128 tebibytes (TiB) for the following engine versions:

• Aurora MySQL versions 3.1 and higher (compatible with MySQL 8.0), 2.09 and higher (compatible with MySQL 5.7), and 1.23 and higher (compatible with MySQL 5.6)

• All Aurora PostgreSQL 14 and 13 versions; Aurora PostgreSQL 12.4, 11.7, 10.12, and 9.6.17 and higher minor versions of each of these versions.

For lower engine versions, the maximum size of an Aurora cluster volume is 64 TiB. For more information, see How Aurora storage automatically resizes.

SQL table size limits

For Aurora MySQL, the maximum table size is 64 tebibytes (TiB). For an Aurora PostgreSQL DB cluster, the maximum table size is 32 tebibytes (TiB). We recommend that you follow table design best practices, such as partitioning of large tables.

To monitor the remaining storage space, you can use the AuroraVolumeBytesLeftTotal metric. For more information, see Cluster-level metrics for Amazon Aurora.