Can you please help me out in solving this weird problem of funcation-based index not being used when I query the table.
This is the comand I fired and the result it returned me.
SQL> create table employees (last_name varchar2(20));
Table created.
SQL> CREATE INDEX upper_ix ON employees (UPPER(last_name));
Index created.
Made the autotrace on and than:-
3. SELECT last_name FROM employees WHERE UPPER(last_name) IS NOT NULL ORDER BY UPPER(last_name);
no rows selected.
Execution Plan
0 SELECT STATEMENT Optimizer=CHOOSE
1 0 SORT (ORDER BY)
2 1 TABLE ACCESS (FULL) OF 'EMPLOYEES'
I fired without order by clause also but no use.
Now can any body please let tell me why this Oracle is having a full scan of the employee table.
TIA,
Marul.
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Author: Marul Mehta
INET: marul_at_zycus.com
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