Constraints and Limitations¶
The following are basic constraints on using tags:
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..