database index
A data structure that can make matching rows cheaper to find.
Use this when A frequent selective query scans far more rows than it returns.
without the term
“Looking up users by email gets slower as we get more users. I think it's checking every row. Can you make that lookup fast?”
with the term · How do you ask a model for database index?
Add an index for this measured query bottleneck. Compare the query plan and account for the extra write cost.
What is database index?
An index supports particular access patterns. It also consumes storage and adds work to writes.
Why does database index matter when vibe coding?
Indexing every column can increase cost without improving the real query.
How do you do database index?
Start from the actual filter and ordering. Check the query plan before and after.
What goes wrong with database index?
The query’s expression or ordering does not match the proposed index.
Sources for this entry
- PostgreSQL: Indexes
Indexes accelerate selected lookups while adding storage and write maintenance.
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