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full hint Tips

Oracle Database Tips by Donald BurlesonJuly 15, 2015

Question:  We have an update statement that has switched from a full-table scan to an "inlist iterator.  Here is the "good" explain plan:

You see ACCESS FULL of the table FACTURA.  But this EXPLAIN PLAN has changed automatically, as we made no manual action:

How do we return this SQL to perform the full-table scan using the FULL hint?

Answer:  Your change was likely caused by automatic CBO statistics re-analysis, but you can "lock-down" a full-table scan by using the "FULL" hint.  Here is an example if the FULL Hint syntax:

select /*+ full parallel(emp,35)*/
emp_name
from
emp
order by
ename;

Using the FULL hint with the PARALLEL hint

When using parallel query, one should seldom turn on parallelism at the table level, alter table customer parallel 35, because the setting of parallelism for a table influences the optimizer. This causes the optimizer to see that the full-table scan is inexpensive. Hence, most Oracle professionals specify parallel query on a query-by-query basis, combining the full hint with the parallel hint to ensure a fast parallel full-table scan.

   
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