UUIDv4 vs UUIDv7 in PostgreSQL: A B-Tree Index Performance Deep Dive

<p>I build one small browser tool a day and write down what I learned. Day 25 was a UUID generator. What started as "make some random IDs" turned into a proper look at how the

<p><em>B-tree internals, column order and planner statistics in Postgres 19, checked against MongoDB's ESR rule.</em></p> <p>Most "add an index" advice stops at <code>CREATE

<p>I'll be honest: I almost did multi-tenancy the wrong way.</p> <p>When I started building InspectIQ "a SaaS platform for Florida home inspectors" my first instinct was to add a

<p>PostgreSQL index design is often misunderstood.</p> <p>Many developers think that creating a good index simply means:</p> <blockquote> <p>“Create an index containing the

<!-- SC_OFF --><div class="md"><p>Hi Reddit, we are a team of database researchers (including a PhD from MIT DB Group) and we just open-sourced an embedded vector database for

<h2> I Thought My Index Would Fix Everything </h2> <p>I added the index.</p> <p>Ran the query.</p> <p>And… nothing changed.</p> <p>Same slow response. Same frustration.</p>

<p>A good way to market a new infrastructure tool is to loudly announce that it is a thousand times faster than whatever you are currently using. This is a very effective strategy