SQL> create table t as select username,password from dba_users; Table created. SQL> desc t
Name Null? Type
----------------------------------------- -------- ----------------------------
USERNAME NOT NULL VARCHAR2(30)
PASSWORD VARCHAR2(30) SQL> create index i_t on t(username); Index created. SQL> set autotrace trace explain
SQL> select * from t where username='EYGLE'; Execution Plan
----------------------------------------------------------
Plan hash value: 1601196873 --------------------------------------------------------------------------
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |
--------------------------------------------------------------------------
| 0 | SELECT STATEMENT | | 1 | 34 | 2 (0)| 00:00:01 |
|* 1 | TABLE ACCESS FULL| T | 1 | 34 | 2 (0)| 00:00:01 |
-------------------------------------------------------------------------- Predicate Information (identified by operation id):
--------------------------------------------------- 1 - filter("USERNAME"='EYGLE')Note
-----
- dynamic sampling used for this statement SQL> set linesize 120
SQL> select /*+ index(t,i_t) */ * from t where username='EYGLE'; Execution Plan
----------------------------------------------------------
Plan hash value: 2928007915 ------------------------------------------------------------------------------------
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |
------------------------------------------------------------------------------------
| 0 | SELECT STATEMENT | | 1 | 34 | 2 (0)| 00:00:01 |
| 1 | TABLE ACCESS BY INDEX ROWID| T | 1 | 34 | 2 (0)| 00:00:01 |
|* 2 | INDEX RANGE SCAN | I_T | 1 | | 1 (0)| 00:00:01 |
------------------------------------------------------------------------------------ Predicate Information (identified by operation id):
--------------------------------------------------- 2 - access("USERNAME"='EYGLE')Note
-----
- dynamic sampling used for this statement |