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What is Database Design and SQL Server Concepts about?

Denormalization is the controlled introduction of redundancy to improve query performance by reducing joins. Primary keys cannot have defaults while unique keys allow one null. Indexes improve performance but slow down modifications due to updating overhead. DBAs troubleshoot performance using tools like execution plans and optimize queries using indexes and statistics. Deadlocks are resolved by terminating one process while live locks occur due to overlapping shared locks.

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