> For the complete documentation index, see [llms.txt](https://mariadb.com/docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://mariadb.com/docs/server/reference/system-tables/information-schema/information-schema-tables/information-schema-key_period_usage-table.md).

# Information Schema KEY\_PERIOD\_USAGE Table

{% hint style="info" %}
This table is available as of MariaDB 11.4.
{% endhint %}

The [Information Schema](/docs/server/reference/system-tables/information-schema.md) `KEY_PERIOD_USAGE` table shows information about [Application-Time Periods](/docs/server/reference/sql-structure/temporal-tables/application-time-periods.md).

It contains the following columns:

| Column              | Description |
| ------------------- | ----------- |
| CONSTRAINT\_CATALOG |             |
| CONSTRAINT\_SCHEMA  |             |
| CONSTRAINT\_NAME    |             |
| TABLE\_CATALOG      |             |
| TABLE\_SCHEMA       |             |
| TABLE\_NAME         |             |
| PERIOD\_NAME        |             |

## Example

<sub>*This page is licensed: CC BY-SA / Gnu FDL*</sub>

{% @marketo/form formId="4316" %}