I will explain Oracle Index Hint Syntax in this post.
Oracle Index Hint Syntax
INDEX Hint: use the specified index for the related table. If your query is not using the Index, you can use this hint to force using it.
You can use the Index hint as follows.
select /*+ index(index_name) */ * from table_name;
SELECT company_name FROM companies c WHERE Company_ID = 1;
You can add /*+ index(c COMP_NDX) */ clause the SQL Statements as follows to force using COMP_NDX Index.
SELECT /*+ index(c COMP_NDX) */ company_name FROM companies c WHERE Company_ID = 1;
If you want to learn more details about why Index hint should be used, read the following post.
Index Hint in Oracle
If you want to learn more details about Oracle Hint, read the following post.
All Index hints in Oracle are as follows.
INDEX_ASC: it is used for Scanning an index in ascending order
INDEX_COMBINE: it is used for choosing a bitmap access path.
INDEX_JOIN: it is used for the optimizer to use an index join as an access path.
INDEX_DESC: it is used for an index scan in descending order.
INDEX_FFS: it is used for a fast-full index scan.
INDEX_SS: it is used for an index skip scan.
NO_INDEX: it is used for not allowing indexes usage.
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