Scaling and high availability #

For each database instance, you may have as many AcraServer instances as you like. However, there’s no need to bring up additional nodes if existing ones have enough CPU/memory to process all requests. Same for AcraTranslator.

On the other hand, you may want to have redundant instances:

• for extremal unpredicted high loads;
• to preserve better application’s availability: while machine X that hosts AcraServer/AcraTranslator is unavailable due to scheduled maintenance, application will switch to machine Y, resulting in some kind of 100% time availability.

Read more about horizontal scaling or vertical scaling.