Multi-table hints are like single-table hints , except that the hint can specify one or more tables or views. Single-table hints are specified on one table or view. Query block hints operate on single query blocks.
In such a case, use hints to force the optimizer to use the optimal execution plan. See Using Optimizer Hints for the discussion of the types and usage of hints. You can use optimizer hints with SQL statements to alter execution plans. No spaces are allowed between the comment delimiter and the plus . There are many Oracle hints available to the developer for use in tuning SQL. This converts the subquery into a special type of hash join between tand tthat.
Some professionals misunderstand hints , believing that they overcome shortcomings of the optimizer. This is not always true, as Oracle hints are used to supply . How to use hints in Oracle sql for performance. With hints one can influence the optimizer.
The usage of hints (with exception of the RULE- hint ) causes Oracle to. A hint is code snippet that is embedded into a SQL statement to suggest to Oracle how the statement should be executed. Oracle Hints Tutorial for improving performance with examples Oracle Hints Oracle Tutorial for beginners. Knowing how to use index hints can help you improve Oracle performance tuning.