Chapter 21. Advanced SQL Tuning

In the last chapter, we emphasized that high-performance stored programs require optimized SQL statements. We then reviewed the basic elements of SQL tuning — namely, how to optimize single-table accesses and simple joins. These operations form the building blocks for more complex SQL operations.

In this chapter, we will look at optimizing such SQL operations as:

  • Subqueries using the IN and EXISTS operators

  • “Anti-joins” using NOT IN or NOT EXISTS

  • “Unamed” views in FROM clauses

  • Named or permanent views

  • DML statements (INSERT, UPDATE, and DELETE)

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