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 |
10 |
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 digits, letters, underscores (_), and hyphens (-). |
Tag values |
A tag value can contain a maximum of 43 characters, including digits, letters, underscores (_), periods (.), and hyphens (-). |
Only some resource types of certain services can be tagged. For details about the services and resource types supported by TMS, see TMS and Other Services.
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