其中Autotrace有如下选项

SET AUTOTRACE OFF

No AUTOTRACE report is generated. This is the default.
SET AUTOTRACE ON EXPLAIN
The AUTOTRACE report shows only the optimizer execution path.
SET AUTOTRACE ON STATISTICS
The AUTOTRACE report shows only the SQL statement execution statistics.
SET AUTOTRACE ON
The AUTOTRACE report includes both the optimizer execution path and the SQL statement execution statistics.
SET AUTOTRACE TRACEONLY
Similar to SET AUTOTRACE ON, but suppresses the printing of the user's query output, if any. If STATISTICS is enabled, query data is still fetched, but not printed.

SQL> select username, sid, serial#, server, paddr, status from v$session;

USERNAME                              SID    SERIAL# SERVER    PADDR            STATUS
------------------------------ ---------- ---------- --------- ---------------- --------
SYS                                  1631         19 DEDICATED 000000007E8D72D8 ACTIVE
SYS                                  1634          2 DEDICATED 000000007E8D9A60 INACTIVE
                                     1636          1 DEDICATED 000000007E8D9278 ACTIVE
                                     1639         12 DEDICATED 000000007E8D6AF0 ACTIVE
                                     1641          3 DEDICATED 000000007E8D8A90 ACTIVE
                                     1645          1 DEDICATED 000000007E8D5338 ACTIVE
                                     1646          1 DEDICATED 000000007E8D4B50 ACTIVE
                                     1647          1 DEDICATED 000000007E8D4368 ACTIVE
                                     1648          1 DEDICATED 000000007E8D3B80 ACTIVE
                                     1649          1 DEDICATED 000000007E8D3398 ACTIVE
                                     1650          1 DEDICATED 000000007E8D2BB0 ACTIVE
                                     1651          1 DEDICATED 000000007E8D23C8 ACTIVE
                                     1652          1 DEDICATED 000000007E8D1BE0 ACTIVE
                                     1653          1 DEDICATED 000000007E8D13F8 ACTIVE
                                     1654          1 DEDICATED 000000007E8D0C10 ACTIVE
                                     1655          1 DEDICATED 000000007E8D0428 ACTIVE
16 rows selected.
SQL> set autotrace on statistics
SQL> select username, sid, serial#, server, paddr, status from v$session where username='SYS';
USERNAME                              SID    SERIAL# SERVER    PADDR            STATUS
------------------------------ ---------- ---------- --------- ---------------- --------
SYS                                  1631         19 DEDICATED 000000007E8D72D8 ACTIVE
SYS                                  1633         33 DEDICATED 000000007E8D72D8 INACTIVE
SYS                                  1634          2 DEDICATED 000000007E8D9A60 INACTIVE
Statistics
----------------------------------------------------------
          1  recursive calls
          0  db block gets
          0  consistent gets
          0  physical reads
          0  redo size
        955  bytes sent via SQL*Net to client
        469  bytes received via SQL*Net from client
          2  SQL*Net roundtrips to/from client
          0  sorts (memory)
          0  sorts (disk)
          3  rows processed