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0 pointstxdv4y ago0 comments

Just sticking with your old horse, has its problems, but you wont get surprised by new ones

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4 comments · 1 top-level

Spivak4y ago· 3 in thread

And the fact that the community and tooling surrounding MySQL is absolutely bonkers massive. It's not that the grass has been trodden down to a path; no there's a 6 lane highway with a rest area and a Cracker Barrel.

leetrout4y ago

LOL amazing metaphor.

The one thing that I've learned recently which surprised me- if you want to cluster MySQL (via partitioned tables or PlanetScale, etc) you cannot use foreign keys.

Some of the Postgres compatible tooling (Citus, Cockroach, etc) appears to support foreign keys across partitions / shards.

I was quite surprised to see this. Makes sense that not allowing FKs makes the data easier to shard but I never imagined that would be a thing you would have to contend with.

aarondf4y ago

I also ran into this recently when looking at SingleStore! I was surprised when they told me I couldn't use foreign keys, and was even more surprised that they were surprised that I do use foreign keys. They acted like I was the only one. And to be fair, given their clientele, I might be the only one!

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vvern4y ago

citus has some rather severe limitations around foreign keys. Namely, you can’t use them from any distributed tables. See https://docs.citusdata.com/en/v10.2/develop/reference_ddl.ht...

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