What is the leading hint in Oracle?

The effectiveness of the LEADING hint is contingent on its exclusive usage. If multiple LEADING hints are specified for different tables, the database ignores all of them, adhering instead to its default join order optimization algorithms.

To address this limitation, the ORDERED hint offers an alternative approach. By specifying the ORDERED hint, users can override any previously set LEADING hints, ensuring that the join order strictly follows the order in which the tables appear in the FROM clause of the SQL query.

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The LEADING hint is a powerful tool in SQL optimization, instructing Oracle to prioritize a specific table in the join order. This directive ensures that the database engine processes the designated table first when executing complex queries involving multiple joins.