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DataOctober 2025
Database indexing and query performance tips
Indexes speed reads but slow writes; the right balance depends on workload, cardinality, and query patterns.
Understand your queries
Collect slow query samples and profile them before adding indexes. Indexes should solve real, observed problems.
Consider composite indexes for multi-column filters and avoid over-indexing which increases maintenance cost.
Maintain and monitor
Monitor index usage and bloat indicators; rebuild or reindex as part of maintenance windows when needed.
Use explain plans to validate that your indexes are being used effectively.