oracle之errors

出現的問題：

SQL> set autot trace on;
SP2-0618: 無法找到會話識別符號。啟用檢查 PLUSTRACE 角色
SP2-0611: 啟用 STATISTICS 報告時出錯

解決辦法：1 conn /as sysdba
SQL> @D:\app\QiLin\product\11.2.0\dbhome_1\sqlplus\admin\plustrce.sql
2 授權
SQL> grant plustrace to scott;

3 開啟
SQL> set autot on;
SQL> set timing on;

4  查詢
SQL> select * from emp;
已選擇14行。

已用時間:  00: 00: 00.03

執行計劃
----------------------------------------------------------
Plan hash value: 3956160932

--------------------------------------------------------------------------
| Id  | Operation         | Name | Rows  | Bytes | Cost (%CPU)| Time     |
--------------------------------------------------------------------------
|   0 | SELECT STATEMENT  |      |    14 |  1218 |     3   (0)| 00:00:01 |
|   1 |  TABLE ACCESS FULL| EMP  |    14 |  1218 |     3   (0)| 00:00:01 |
--------------------------------------------------------------------------

Note
-----
   - dynamic sampling used for this statement (level=2)

統計資訊
----------------------------------------------------------
          0  recursive calls
          0  db block gets
          8  consistent gets
          0  physical reads
          0  redo size
       1455  bytes sent via SQL*Net to client
        416  bytes received via SQL*Net from client
          2  SQL*Net roundtrips to/from client
          0  sorts (memory)
          0  sorts (disk)
         14  rows processed

SQL>