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 index_rs_asc hint tips

Oracle Database Tips by Donald BurlesonMarch 25, 2015

Question:  What is the index_rs_asc hint?  Also, when do I use the index_rs_asc hint tips hint in a query with an index hint?

Answer:  Oracle has provided an index hint that directs Oracle to use a specified index.  However, prior to the introduction of index_rs_asc and index_rs_desc, Oracle did not specify what type of index access to perform:

1 - Index full scan

2 - Index fast full scan

3 - Index range scan (ascending)

4 - Index range scan (descending)

The index_rs_asc hint is used to invoke an ascending index range scan upon the target index.  There is also the related index_rs_desc hint to force an descending index range scan. 

Using these hints, you can not only direct that an index be used, but direct how the index will access the table.  The index_rs_asc hint can accept arguments for the target table name and the target index name:

select index_rs_asc (emp emp_id_idx)
   stuff
from

   emp;

select index_rs_dec (c cust_state_idx)
   stuff
from

   customer c;

 
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