# Cross geo-location Database Region Placement Policy

__*Table and Placement Policy*__

+ Specify table to deploy to different geo-location or host
+ Enable cross geolocation application deployment
+ Ensure data local replica available for local stale read

![right](./student-guide/diagram/PlacementPolicy_en_001_20220504.png)

```
tidb> SHOW PLACEMENT LABELS;
+--------+-------------------------+
| Key    | Values                  |
+--------+-------------------------+
| disk   | ["hdd", "ssd"]          |
| engine | ["tiflash"]             |
| ~!@region@!~ | ["seattle", "shanghai"] |
+--------+-------------------------+
3 rows in set (0.00 sec)
```

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Using the Placement Rules feature, users can specify tables and partitions to be deployed to different regions and host (TiKV configuration is required). Applicable scenario include:

 Low cost optimization data high availability strategy

 Ensure local replica of data is available for local stale read
 
 Compliance with local data requirements, etc.

The underlying implementation of Placement Rules relies on the placement rules (placement rules) function provided by PD