Constraints and Limitations

The following are basic constraints on using tags:

Table 1 Constraints

Item

Specifications

Maximum number of key-value pairs you can add for each resource

20

Tags of each resource

For each resource, each tag key must be unique, and each tag key can have only one tag value.

Maximum number of predefined tags that you can create for an account

500

Predefined tags

If the created predefined tag is the same as an existing predefined tag, the existing predefined tag is overwritten. If only keys are the same and values are different, both the tags are available.

Tag keys

A tag key can contain a maximum of 36 characters, including only digits, letters, hyphens (-), at signs (@), and underscores (_).

Tag values

A tag value can contain a maximum of 43 characters, including only digits, letters, hyphens (-), at signs (@), and underscores (_).

Note

Not all resources are supported by TMS. For which services and resources are supported, see TMS and Other Services..