Oracle keeps score on every SQL statement it runs: how often it executed, how much CPU it burned, how many blocks it touched, and which plan it used. In this chapter, you will use V$SQL, V$SQL_PLAN, and V$ACTIVE_SESSION_HISTORY, plus DBMS_STATS, to answer the questions that matter in production: Which SQL is expensive? Which plan is it really using? What was it waiting on when things slowed down? Are bad ...
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