When you provision aRealtime Database instance, you must choose alocation for theinstance. To reduce latency and increase availability, store your data close tothe users and services that need it.

If your project is on the pay-as-you-go Blaze pricing plan, then you can optionallycreate multiple databases in your project, eachwith its own location setting.

Be aware that once you provision a database instance, you cannot change itslocation setting.