May 2018
Beginner to intermediate
250 pages
6h 14m
English
Content preview from Practical DevOps, Second Edition - Second Edition
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Handling database migrations
Handling changes in a relational database requires special consideration.
A relational database stores both data and the structure of the data. Upgrading a database schema offers other challenges than the ones present when upgrading program binaries. Usually, when we upgrade an application binary, we stop the application, upgrade it, and then start it again. We don't really bother about the application state. That is handled outside of the application.
When upgrading databases, we do need to consider state, because a database contains comparatively little logic and structure, but contains much state.
To describe a database structure change, we issue a command to change the structure.
The database structures before ...
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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.