Oracle 无法在解释计划中获取A-time和A-row

嗨，古鲁斯，

我在生成sql计划时遇到了一个问题。
我试过了

ALTER SESSION SET STATISTICS_LEVEL=ALL;

"并使用"

/*+ GATHER_PLAN_STATISTICS */

"提示
在运行查询之后，我运行下面的语句，不知道为什么输出没有显示A-Time和A-Row。

SELECT * FROM TABLE(DBMS_XPLAN.DISPLAY_CURSOR(
  SQL_ID => 'SQL_ID',
  FORMAT => 'ALL ALLSTATS LAST')) T;

请分享您的建议。

先谢了。

我们需要查看您从头到尾的测试用例，因为这样工作正常

SQL> ALTER SESSION SET STATISTICS_LEVEL=ALL;

Session altered.

SQL>
SQL> select /*+ GATHER_PLAN_STATISTICS */ * from scott.emp;

     EMPNO ENAME      JOB              MGR HIREDATE         SAL       COMM     DEPTNO
---------- ---------- --------- ---------- --------- ---------- ---------- ----------
      7369 SMITH      CLERK           7902 17-DEC-80        800                    20
      7499 ALLEN      SALESMAN        7698 20-FEB-81       1600        300         30
      7521 WARD       SALESMAN        7698 22-FEB-81       1250        500         30
      7566 JONES      MANAGER         7839 02-APR-81       2975                    20
      7654 MARTIN     SALESMAN        7698 28-SEP-81       1250       1400         30
      7698 BLAKE      MANAGER         7839 01-MAY-81       2850                    30
      7782 CLARK      MANAGER         7839 09-JUN-81       2450                    10
      7788 SCOTT      ANALYST         7566 09-DEC-82       3000                    20
      7839 KING       PRESIDENT            17-NOV-81       5000                    10
      7844 TURNER     SALESMAN        7698 08-SEP-81       1500                    30
      7876 ADAMS      CLERK           7788 12-JAN-83       1100                    20
      7900 JAMES      CLERK           7698 03-DEC-81        950                    30
      7902 FORD       ANALYST         7566 03-DEC-81       3000                    20
      7934 MILLER     CLERK           7782 23-JAN-82       1300                    10

14 rows selected.

SQL>
SQL> SELECT * FROM TABLE(DBMS_XPLAN.DISPLAY_CURSOR(
  2    FORMAT => 'ALL ALLSTATS LAST')) T;

PLAN_TABLE_OUTPUT
--------------------------------------------------------------------------------------------------------------------------------
SQL_ID  9n0y4yp82wp0q, child number 0
-------------------------------------
select /*+ GATHER_PLAN_STATISTICS */ * from scott.emp

Plan hash value: 3956160932

-----------------------------------------------------------------------------------------------------------------------------
| Id  | Operation         | Name | Starts | E-Rows |E-Bytes| Cost (%CPU)| E-Time   | A-Rows |   A-Time   | Buffers | Reads  |
-----------------------------------------------------------------------------------------------------------------------------
|   0 | SELECT STATEMENT  |      |      1 |        |       |     3 (100)|          |     14 |00:00:00.01 |       7 |      6 |
|   1 |  TABLE ACCESS FULL| EMP  |      1 |     14 |   518 |     3   (0)| 00:00:01 |     14 |00:00:00.01 |       7 |      6 |
-----------------------------------------------------------------------------------------------------------------------------

Query Block Name / Object Alias (identified by operation id):
-------------------------------------------------------------

   1 - SEL$1 / EMP@SEL$1

Column Projection Information (identified by operation id):
-----------------------------------------------------------

   1 - "EMP"."EMPNO"[NUMBER,22], "EMP"."ENAME"[VARCHAR2,10], "EMP"."JOB"[VARCHAR2,9], "EMP"."MGR"[NUMBER,22],
       "EMP"."HIREDATE"[DATE,7], "EMP"."SAL"[NUMBER,22], "EMP"."COMM"[NUMBER,22], "EMP"."DEPTNO"[NUMBER,22]


24 rows selected.