Database Performance Fundamentals Before Scaling
Performance work usually starts with one visible query or index—not a move to a more complex architecture.
Performance work usually starts with one visible query or index—not a move to a more complex architecture.
The decision that should precede delivery
Observe slow queries and query count per request, then inspect execution plans. Add indexes for real access patterns and select the fields you need instead of fetching everything.
Document system boundaries, failure modes, and data ownership before choosing technical details. A sound engineering decision explains the cost of operation and change, not only initial build cost.
A reviewable checklist
- Prevent N+1 with eager loading
- Index sort and filter paths
- Paginate large results
- Cache with clear invalidation rules
Review questions before scaling
- Has the team documented: Prevent N+1 with eager loading?
- Has the team documented: Index sort and filter paths?
- Has the team documented: Paginate large results?
Keep each answer beside the decision, owner, and review date. If the required signal is unavailable, reduce the experiment instead of expanding delivery scope.
Turn the insight into an action
Choose one decision you can apply this week, assign an owner and success signal, then review the result before expanding scope.