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Re:Introducing “Database Performance at Scale”: A Free, Open... by pipo234 on Thursday October 05, 2023 @11:42AM (#37780067)
Yes, seems like the GitHhub repo was a bit of an after thought:

Top right:

> About > SOURCE CODE for "Database Performance at Scale: A Practical Guide (Apress, 2023)," by Felipe Cardeneti Mendes, Piotr Sarna, Pavel Emelyanov & Cynthia Dunlop

But readme.md:

> This repository ACCOMPANIES Database Performance at Scale:A Practical Guide by Felipe Cardeneti Mendes, Piotr Sarna, Pavel Emelyanov & Cynthia Dunlop (Apress, 2023).

[ my emphasis ]

Re:Introducing “Database Performance at Scale”: A Free, Open... by iudqnolq on Thursday October 05, 2023 @02:32PM (#37782245)
In the context of technical books "source code for" often means "source code for [readers of the book to reference while reading]" rather than "source code for [building the book]"
Re:Introducing “Database Performance at Scale”: A Free, Open... by maximinus_thrax on Thursday October 05, 2023 @06:41PM (#37785171)
I disagree. Words have meaning. 'Open source' means 'open source' in all contexts.

For comparison, https://doc.rust-lang.org/book/ is an open source book. A PDF with a CC license without a repo of the publishing artifacts is not an open source book. It's just a free book.

Re:Introducing “Database Performance at Scale”: A Free, Open... by iudqnolq on Thursday October 05, 2023 @06:48PM (#37785227)
The question is not whether it's open source, the question is what it is.