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Auto-incrementing IDs are anathema to that.ĭestroy is a strong word (and UUIDs can certainly be sorted, but locality is an issue), but all of software is a series of tradeoffs. It's even wrong in a monolith! Why does everyone abandon this idea of "separation of concerns" and "single responsibility principle" and "bounded contexts" and proper abstraction and limited communication between system parts and literally every design principle they've ever been taught when they go to design a database? It all just goes out the window! Why do you guys bother reading books about system design if you ignore them when you build a database? "Multiple systems communicating with each other" should apply recursively all the way from deployment and external integration down to individual functions. Otherwise they are making a serious and extremely avoidable mistake. Or even sharing any common data at all between different systems, like unit conversions, chemical data, country names, engineering constants, etc.Īnyone who even considers using a single authoritative source for all entity identity either better be making a system in an underground bunker that will never talk to any other system.
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Test, staging, and production deployments, with multiple of each. Users submitting data from a form is a data source. You are always combining multiple data sources, all the time. This insane idea that combining data sources is a rare event in some unusual "migration and recovery" scenarios is one of the most poisonous and yet pervasive ideas in all of database design. > if you ever need to combine multiple data sources together in migration and recovery type scenarios In my book, this is a Windows bug, but opinions may differ here. sorting) that depends on the representation of a UUID (or even depends on converting between string and binary representations), be aware that UUIDs coming from Windows may be little-endian. I don’t know the whole history, but MS somehow took this structure at face value and caused problems like this:
UUID GENERATOR V4 PYTHON PORTABLE
(Hint: do not use integer types in C code for portable data structures.
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Those aren’t bytes - they’re integers of various sizes. While this new draft discusses sorting UUIDs as strings of octets (bytes) and the text of RFC4122 is fairly explicit about most significant bytes coming first, the C UUID structure in RFC 4122 appendix A is entirely misguided: UUIDs have historically massively screwed up endian handling. Fortunately this is a bit less relevant today as Windows loses market share in database and server applications, but: