Comment by dotancohen 7 hours ago
IDs are typically unique primary key. But in my experience, adding LIMIT 1 would on average halve the time taken to retrieve the record.
I'll test again, really the last time I tested that was two decades ago.
Yes, I was using Mysql exclusively at the time. I don't recall which version.
I also tested this once years later when doing a Python app with sqlite. Similar result, but admittedly that was not a very big table to begin with.
I am meticulous with my database schemas, and periodically review my indexes and covering indexes. I'm no DBA, but I believe that the database is the only real value a codebase has, other than maybe a novel method here and there. So I put care into designing it properly and testing my assumptions.
You are certainly doing something wrong if that's true.
I'm curious, can you demo this?
I'm curious as well to see if this still holds up. I'll try this week.
That seems like your RDBMS wasn't handling something right there or there wasn't a unique index on the column.
Do you recall what the database server was?