Tagging Restrictions in DynamoDB - Amazon DynamoDB

Tagging Restrictions in DynamoDB

Each tag consists of a key and a value, both of which you define. The following restrictions apply:

  • Each DynamoDB table can have only one tag with the same key. If you try to add an existing tag (same key), the existing tag value is updated to the new value.

  • Tag keys and values are case sensitive.

  • The maximum key length is 128 Unicode characters.

  • The maximum value length is 256 Unicode characters.

  • The allowed characters are letters, white space, and numbers, plus the following special characters: + - = . _ : /

  • The maximum number of tags per resource is 50.

  • AWS-assigned tag names and values are automatically assigned the aws: prefix, which you can't assign. AWS-assigned tag names don't count toward the tag limit of 50. User-assigned tag names have the prefix user: in the cost allocation report.

  • You can't backdate the application of a tag.