Restrictions for using tags to label resources in Amazon Keyspaces - Amazon Keyspaces (for Apache Cassandra)

Restrictions for using tags to label resources in Amazon Keyspaces

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

  • Each Amazon Keyspaces keyspace or 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.

  • Tags applied to a keyspace do not automatically apply to tables within that keyspace. To apply the same tag to a keyspace and all its tables, each resource must be individually tagged.

  • When you create a multi-Region keyspace or table, any tags that you define during the creation process are automatically applied to all keyspaces and tables in all Regions. When you change existing tags using ALTER KEYSPACE or ALTER TABLE, the update is only applied to the keyspace or table in the Region where you're making the change.

  • A value acts as a descriptor within a tag category (key). In Amazon Keyspaces the value cannot be empty or null.

  • 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.