Oracle Database 10g Enterprise Edition Release 10.2.0.3.0 - Prod
PL/SQL Release 10.2.0.3.0 - Production
CORE    10.2.0.3.0      Production
TNS for 32-bit Windows: Version 10.2.0.3.0 - Production
NLSRTL Version 10.2.0.3.0 - Production

SQL> conn fantasy/oracle
已连接。

SQL> select * from test1 where tname='fantasy';

执行计划
----------------------------------------------------------
Plan hash value: 3460867755

--------------------------------------------------------------------------------
-----
| Id  | Operation                   | Name  | Rows  | Bytes | Cost (%CPU)| Time
    |
--------------------------------------------------------------------------------
-----
|   0 | SELECT STATEMENT            |       |     1 |    10 |     2   (0)| 00:00
:01 |
|   1 |  TABLE ACCESS BY INDEX ROWID| TEST1 |     1 |    10 |     2   (0)| 00:00
:01 |
|*  2 |   INDEX RANGE SCAN          | TT    |     1 |       |     1   (0)| 00:00
:01 |
--------------------------------------------------------------------------------
-----

Predicate Information (identified by operation id):
---------------------------------------------------

   2 - access("TNAME"='fantasy')

SQL> select /*+ full(test1) */* from test1 where tname='fantasy';

执行计划
----------------------------------------------------------
Plan hash value: 4122059633

---------------------------------------------------------------------------
| Id  | Operation         | Name  | Rows  | Bytes | Cost (%CPU)| Time     |
---------------------------------------------------------------------------
|   0 | SELECT STATEMENT  |       |     1 |    10 |     3   (0)| 00:00:01 |
|*  1 |  TABLE ACCESS FULL| TEST1 |     1 |    10 |     3   (0)| 00:00:01 |
---------------------------------------------------------------------------

Predicate Information (identified by operation id):
---------------------------------------------------

   1 - filter("TNAME"='fantasy')

SQL> alter session set tracefile_identifier='fantasy';

会话已更改。

SQL> alter session set sql_trace=true;

会话已更改。

SQL> declare
  2  v_sql varchar(500);
  3  begin
  4  v_sql :='select /*+ full(test1) */* from test1 where tname=''fantasy''';
  5  execute immediate v_sql;
  6  end;
  7  /

PL/SQL 过程已成功完成。

SQL> alter session set sql_trace=false;

会话已更改。

select /*+ full(test1) */*
from
 test1 where tname='fantasy'

tkprof之后发现：

call     count       cpu    elapsed       disk      query    current        rows
------- ------  -------- ---------- ---------- ---------- ----------  ----------
Parse        1      0.00       0.00          0          0          0           0
Execute      1      0.00       0.00          0          0          0           0
Fetch        0      0.00       0.00          0          0          0           0
------- ------  -------- ---------- ---------- ---------- ----------  ----------
total        2      0.00       0.00          0          0          0           0

Misses in library cache during parse: 0
Optimizer mode: ALL_ROWS
Parsing user id: 55     (recursive depth: 1)

Rows     Row Source Operation
-------  ---------------------------------------------------
      0  TABLE ACCESS FULL TEST1 (cr=0 pr=0 pw=0 time=7 us)