db-index-strategy
DB Index Strategy
Overview
Use this skill to choose indexes that improve real workloads while controlling write and storage costs.
Scope Boundaries
- Query latency hotspots are driven by access-path inefficiency.
- New query patterns or sort requirements are introduced.
- Existing indexes show redundancy, bloat, or unstable plans.
Core Judgments
- Query-path priority by business impact and frequency.
- Composite key order by filter selectivity and sort usage.
- Covering/partial/functional index suitability by engine capability.
- Write amplification and maintenance cost tolerance.
Practitioner Heuristics
- Indexes should be justified by concrete query families, not single ad hoc queries.
- Composite index order follows filter-first then sort semantics.
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