Researchly - AI-Powered Web Research
Research the web with AI. Get accurate, up-to-date information with sources powered by real-time web search.
Summary
UUID Version 4 primary keys in Postgres cause poor performance due to randomness leading to index page splits, fragmentation, excessive IO, and worse cache hit ratios.
They consume more space than integers and lack natural ordering, making inserts, updates, deletes, and lookups inefficient for web app databases. Alternatives like integers, big integers, or time-ordered UUID Version 7 perform better with sequential inserts and compact indexes.
