Indeksimi dhe përmirësimi i performancës në SQL
summary
Shows three concrete indexing changes: adding a clustered vs nonclustered index, creating a composite index on (first_name,last_name,place_of_birth), and removing a full table scan. Uses SQL Server tools SET STATISTICS IO/TIME and missing index DMVs to measure results. A sample query drops from ~1.2s to ~12ms (≈100x) while insert/update costs rise about 2–5x; explains data‑type effects (varchar vs XML/varbinary) and when an index hurts instead of helps.
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