In database query optimization, what is a "hint"?
- A command used to terminate the execution of a long-running query.
- A suggestion provided to the query optimizer to influence the execution plan chosen for a particular query.
- A warning message indicating potential performance issues in a query.
- An error message generated when the syntax of a query is incorrect.
In the context of database query optimization, a hint is a directive provided to the query optimizer to guide its choice of execution plan for a specific query. Hints can be used to instruct the optimizer to consider or avoid specific optimization strategies, such as index usage or join methods. While hints can sometimes improve performance, they are typically used as a last resort when other optimization techniques have failed to produce satisfactory results.
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