On Wed, Mar 31, 2021 at 3:36 AM Mohan Radhakrishnan <radhakrishnan.mohan@xxxxxxxxx> wrote: > > Hello, > We have UUIDs in our tables which are primary keys. But in some cases > we also identify a composite unique key apart from the primary key. > > My assumption is that there should be a unique key index created by us using the composite key. And when we fetch using this composite key instead of the primary key we have a performance boost due to the index. > > Is this right ? Are there more details I should read to understand this better ? Please point. If I should use the query planner to look at the statistics I will. This is one of the great debates in computer science and it is not settled. There are various tradeoffs around using a composite key derived from the data (aka natural key) vs generated identifiers. It's a complex topic with many facets: performance, organization, validation, and correctness are all relevant considerations. I would never use UUIDS for keys though. merlin
