Service Quotas

Note

The Service Quotas console provides information about Amazon Athena quotas. You can also use the Service Quotas console to request quota increases for the quotas that are adjustable. For AWS Glue related schema limitations, see the AWS Glue endpoints and quotas page. For general information about AWS service quotas, see AWS service quotas in the AWS General Reference.

Queries

Your account has the following query-related quotas for Amazon Athena. For details, see the Amazon Athena endpoints and quotas page of the AWS General Reference.

• Active DDL queries – The number of active DDL queries. DDL queries include CREATE TABLE and ALTER TABLE ADD PARTITION queries.

• DDL query timeout – The maximum amount of time in minutes a DDL query can run before it gets cancelled.

• Active DML queries – The number of active DML queries. DML queries include SELECT, CREATE TABLE AS (CTAS), and INSERT INTO queries. The specific quotas vary by AWS Region.

• DML query timeout – The maximum amount of time in minutes a DML query can run before it gets cancelled. You can request an increase in this timeout up to a maximum of 240 minutes.

To request quota increases, you can use the Athena Service Quotas console.

Athena processes queries by assigning resources based on the overall service load and the number of incoming requests. Your queries may be temporarily queued before they run. Asynchronous processes pick up the queries from queues and run them on physical resources as soon as the resources become available and for as long as your account configuration permits.

A DML or DDL query quota includes both running and queued queries. For example, if your DML query quota is 25 and your total of running and queued queries is 26, query 26 will result in a TooManyRequestsException error.

Note

If you would like to control concurrency directly for the queries you run in Athena, you can use capacity reservations. For more information, see Managing query processing capacity.

Query string length

The maximum allowed query string length is 262144 bytes, where the strings are encoded in UTF-8. This is not an adjustable quota. However, you can work around this limitation by splitting long queries into multiple smaller queries. For more information, see How can I increase the maximum query string length in Athena? in the AWS Knowledge Center.

Workgroups

When you work with Athena workgroups, remember the following points:

• Athena service quotas are shared across all workgroups in an account.

• The maximum number of workgroups you can create per Region in an account is 1000.

• The maximum number of prepared statements in a workgroup is 1000.

• The maximum number of tags per workgroup is 50. For more information, see Tag restrictions.

Databases, tables, and partitions

• If you are using the AWS Glue Data Catalog with Athena, see AWS Glue endpoints and quotas for service quotas on tables, databases, and partitions – for example, the maximum number of databases or tables per account.

  • Although Athena supports querying AWS Glue tables that have 10 million partitions, Athena cannot read more than 1 million partitions in a single scan.

• If you are not using AWS Glue Data Catalog, the number of partitions per table is 20,000. You can request a quota increase.

Amazon S3 buckets

When you work with Amazon S3 buckets, remember the following points:

• Amazon S3 has a default service quota of 100 buckets per account.

• Athena requires a separate bucket to log results.

• You can request a quota increase of up to 1,000 Amazon S3 buckets per AWS account.

Per account API call quotas

Athena APIs have the following default quotas for the number of calls to the API per account (not per query):

API name	Default number of calls per second	Burst capacity
BatchGetNamedQuery, ListNamedQueries, ListQueryExecutions	5	up to 10
CreateNamedQuery, DeleteNamedQuery, GetNamedQuery	5	up to 20
BatchGetQueryExecution	20	up to 40
StartQueryExecution, StopQueryExecution	20	up to 80
GetQueryExecution, GetQueryResults	100	up to 200

For example, you can make up to 20 calls per second for StartQueryExecution. In addition, if this API is not called for 4 seconds, your account accumulates a burst capacity of up to 80 calls. In this case, your application can make up to 80 calls to this API in burst mode.

If you use any of these APIs and exceed the default quota for the number of calls per second, or the burst capacity in your account, the Athena 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, or the burst capacity for the API for this account.

The Athena quota for per account API calls for cannot be changed in the Athena Service Quotas console. To request a quota increase for Athena API calls, navigate to the AWS Support Service limit increase page and complete and submit the form.