Fundamental to any operational database is its ability to store information durably and be resilient to unexpected machine failures. In more technical terms, an operational database must:
Persist all its information to disk storage for durability.
Ensure data is highly available by maintaining a readily available second copy of all data, and automatically failover without downtime in case of server crashes.
The previous chapters have been touting the ability of in-memory, distributed, SQL-based (relational) databases to provide the fastest performance for a wide amount of use cases, but the data persistence question always arises:
If the database is “in-memory,” what guarantees are there that the data will be fully persistent and always available?
This section will dive deep into the details of in-memory, distributed, SQL relational database systems and how they can be architected to guarantee data durability and high availability. Figure 8-1 presents a high-level architecture that illustrates how an in-memory database could provide these guarantees.
Figure 8-1. In-memory database persistence and high availability
Data Durability
For data storage to be durable, it must survive in the event of a server failure. After the server failure, the data should be recoverable into a transactionally consistent state without any data loss or ...
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month, and much more.
O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.
Julian F.
Head of Cybersecurity
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.
Addison B.
Field Engineer
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.
Amir M.
Data Platform Tech Lead
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.
O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.
