composite index
One index covers an ordered combination of columns.
Use this when A query repeatedly filters and sorts by several fields.
without the term
“We filter orders by customer and status and sort by date, and it's slow even though each column has its own index. Can you make that combined query fast?”
with the term · How do you ask a model for composite index?
Evaluate a composite index for this filter and sort. Explain the column order and verify the plan on representative data.
What is composite index?
A composite index stores multiple key columns. Their order affects the access patterns the database can use efficiently.
Why does composite index matter when vibe coding?
Separate indexes on each field may not serve the combined query well.
How do you do composite index?
Match key order to the measured filter and sort. Check the actual plan with representative values.
What goes wrong with composite index?
Choosing column order from the table definition instead of the query.
Sources for this entry
- PostgreSQL: Multicolumn indexes
Index key order affects which filters efficiently limit the scan; behavior varies by index access method.
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