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Don Burleson Blog 







Oracle Hints

Oracle Database Tips by Donald BurlesonJune 13, 2015

Question:  What are Oracle hints, and how do I use them?

Answer:  An Oracle hint is an optimizer directive that is embedded into an SQL statement to suggest to Oracle how the statement should be executed.  For example, here is an Oracle hint to change the default optimizer mode for a query:

Select /*+first_rows(10) */

You can follow these steps for tuning your Oracle hints and then reverse engineer the regular SQL statements to emulate the execution plan generated by the hints is one of many ways to use Oracle hints.  Using Oracle hints can be extremely complicated, which is why Oracle hints are considered to be a last resort measure as a means to change your SQL execution plan (after changing CBO statistics, instance parameters, etc.).  There is a large number of Oracle hints for use in optimizing your SQL, and some hints are not documented at all. 

Here are some related notes on Oracle hints:

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