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Execution plans, statistics, SARGability, row estimates, workload tuning, and slow-query diagnosis.
Practice items tagged with SQL Query Performance.
Explains physical connection reuse, pool partitioning, short ownership, exhaustion causes, diagnostics, and why increasing the pool is not the first fix.
Uses an ordered window aggregate to calculate a deterministic running balance per account.
Combines daily aggregation, a calendar table, and a window frame to calculate true seven-calendar-day revenue.
Designs a narrow covering index from predicates and ordering, then weighs eliminated lookups against storage, write overhead, cache efficiency, overlap, and maintenance cost.
Protects transactional traffic from reporting load through freshness requirements, bounded asynchronous jobs, tuned summaries, workload isolation, replicas or warehouses, and explicit capacity gates.
Separates a live blocking chain from a deadlock victim, gathers the right database evidence, stabilizes the incident, and fixes lock duration or access order.