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AWS Database Migration Service
User Guide (Version API Version 2016-01-01)

Limits for AWS Database Migration Service

This topic describes the resource limits and naming constraints for AWS Database Migration Service (AWS DMS).

The maximum size of a database that AWS DMS can migrate depends on your source environment, the distribution of data in your source database, and how busy your source system is. The best way to determine whether your particular system is a candidate for AWS DMS is to test it out. Start slowly so you can get the configuration worked out, then add some complex objects, and finally, attempt a full load as a test.

Limits for AWS Database Migration Service

Each AWS account has limits, per region, on the number of AWS DMS resources that can be created. Once a limit for a resource has been reached, additional calls to create that resource will fail with an exception.

The 6 TB limit for storage applies to the DMS replication instance. This storage is used to cache changes if the target cannot keep up with the source and for storing log information. This limit does not apply to the target size; target endpoints can be larger than 6 TB.

The following table lists the AWS DMS resources and their limits per region.

Resource Default Limit
Replication instances 20
Total amount of storage 6 TB
Event subscriptions 100
Replication subnet groups 20
Subnets per replication subnet group 20
Endpoints 100
Tasks 200
Endpoints per instance 20