Hacker News Reader

It's way easier to scale a shared app/db, anyone who tells you different hasn't had to do devops.

Rule No. 1, never shard by account_id, Pareto is just waiting you kick you in the ass. Always shard by whatever gives the best distribution of workload.

There are more rules of course.

View on HN

I've always considered data isolation as the #1 priority when it comes to tenancy. Does that mean that the sharding should defacto be done on the tenant ID?

You shard for load distribution. If data isolation is #1 priority, use separate tables, schemas, database instances.

Separate disks, separate machines hell even separate networks, proper data isolation can be super expensive to do right.

Reply on news.ycombinator.com