Availability features of PlanetScaleDB

This document provides an overview of the availability features of PlanetScaleDB.

Overview

PlanetScaleDB availability depends on the number of database instances you create for your database.

Availability levels

PlanetScaleDB offers the following availability levels. The number of database instances you select when you create your database determines the availability level for your database.

Level 1 Availability

1 database instance
99.95% availability
No cross-zone survivability

Level 2 Availability

2 database instances
99.95% availability
Cross-zone survivability
2x read scaling

Level 3 Availability

3 database instances
99.95% availability
Cross-zone survivability
3x read scaling

Cross-zone survivability

Cloud providers divide their networks into (availability) zones and regions, which contain multiple zones. Cross-zone survivability means that, if one of the zones that contains one of your database instances fails, your database will survive.

Read scaling

Database instances beyond 3 continue to provide linear increase to read capacity. For example, 4 database instances provide 4x read capacity compared to 1 database instance, and so on.