A Clustered Index Scan is not always the problem. Count the reads for a seek with lookups, a scan and the optimizer’s own pick, then see when the seek really wins.
Indexed Views: When the Faster Reads Are Worth It
Evaluate indexed views by building a sales summary, comparing read savings with write maintenance, and using NOEXPAND where required.
AT TIME ZONE Cost: Converting Many Rows Without Burning CPU
Converting a whole column with AT TIME ZONE looks harmless on three rows and hurts on a hundred thousand. Here is the cheaper way to filter a local day.
What Lock Escalation Is and How to Stop It
Understand lock escalation, confirm it with evidence, and reduce its impact through smaller transactions, better access paths, and modern locking.
Large IN Lists: When a Temp Table Beats Thousands of Values
Pasting thousands of IDs into an IN list works, until it does not. See where the time goes and how to keep the answer the same with a temp table.
SSAS Cube Performance: Diagnosing a Sudden Slowdown
SSAS cube performance diagnosis starts with the exact slow request. Follow storage, MDX calculations, cache, processing, and resource evidence before choosing a fix.
Troubleshooting Cube Performance: Three Checks
Diagnose cube performance by comparing the same MDX query, processing changes and resource pressure before choosing a repair.