August 2017
Intermediate to advanced
332 pages
9h 16m
English
Content preview from Continuous Delivery with Docker and Jenkins
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Introducing database migrations
Database schema migration is a process of incremental changes to the relational database structure. Let's have a look at the following diagram to understand it better:
The database in the version v1 has the schema defined by the V1_init.sql file. Additionally, it stores the metadata related to the migration process, for example, its current schema version and the migration changelog. When we want to update the schema, we provide the changes in the form of a SQL file, such as V2_add_table.sql. Then, we need to run the migration tool that executes the given SQL file on the database (it also updates the metatables). ...
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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.