November 2019
Intermediate to advanced
408 pages
9h 56m
English
Content preview from Hands-On Docker for Microservices with Python
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Dealing with database migrations
Database migrations are changes that are made to the persistent data that's stored in a particular environment (normally, in one or more databases). Most of the time, this means changing the database schema, but there are others.
The data in a production environment is the most important asset in a running system. Extra care is advised for database migrations.
In certain cases, a migration may lock a table for a certain period of time, thereby rendering the system unusable. Ensure that you test your migrations properly in order to avoid or at least prepare for these cases.
Though database migrations may technically be reversible, doing so is very expensive in terms of development time. For example, adding ...
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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.
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.
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.
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.