[大数据]SQL Plus中的SET TERMOUT

起因是我写了一个脚本，需要用spool命令将SQL Monitor的输出存放在文件中，但不想输出到屏幕上。

脚本的结构如下：

set timing on
sql_statement_here
set timing off
spool sqlmonitor.html
SELECT DBMS_SQL_MONITOR.REPORT_SQL_MONITOR(report_level => 'ALL', type => 'ACTIVE') FROM dual;
spool off

由于SQL monitor的输出已经存放到html文件中，我并不需要在屏幕上输出。这是可以用SET TERMOUT命令。
修改后的脚本如下：

set timing on
sql_statement_here
set timing off
set termout off
spool sqlmonitor.html
SELECT DBMS_SQL_MONITOR.REPORT_SQL_MONITOR(report_level => 'ALL', type => 'ACTIVE') FROM dual;
spool off
set termout on

SET TERMOUT的说明见文档：

Controls the display of output generated by commands in a script that is executed with @, @@ or START. OFF suppresses the display so that you can spool output to a file without displaying the output on screen. ON displays the output on screen. TERMOUT OFF does not affect output from commands you enter interactively or redirect to SQL*Plus from the operating system.

注意，此设置仅对以@，@@和START执行的脚本生效。

例如以下的a.sql文件：

set timing on
set termout off
select sysdate from dual;

执行效果如下：

$ sqlplus -S ssb/$SSBPWD@orclpdb1 @a.sql
$ sqlplus -S ssb/$SSBPWD@orclpdb1 <a.sql

SYSDATE
---------
14-OCT-22

Elapsed: 00:00:00.00

当然，交互执行也不受影响：

SQL> set timing on
SQL> set term off
SQL> select sysdate from dual;

SYSDATE
---------
14-OCT-22

Elapsed: 00:00:00.00