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在大家写脚本的时候，我们常常用set语句在设置一些需要的格式规范。下面，列举了几个常见set语句的应用。
SQL> set echo on—————————————————设置运行命令是是否显示语句
SQL> set feedback on———————————————-设置显示“已选择XX行”
SQL> set colsep | —————————————————设置列与列之间的分割符号
SQL> set pagesize 10———————————————–设置每一页的行数
SQL> SET SERVEROUTPUT ON——————————-设置允许显示输出类似dbms_output.putline
SQL> set heading on————————————————设置显示列名
SQL> set timing on————————————————–设置显示“已用时间：XXXX”
SQL> set time on—————————————————–设置显示当前时间
SQL> set autotrace on———————————————–设置允许对执行的sql进行分析
00:38:28 SQL> set echo on
00:38:37 SQL> @E:echo.sql
00:38:41 SQL> select status from v$datafile where rownum<6;
STATUS
-------
SYSTEM
ONLINE
ONLINE
ONLINE
ONLINE
已选择5行。
已用时间: 00: 00: 01.08
00:38:43 SQL> set echo off
00:38:58 SQL> @E:echo.sql
STATUS
——-
SYSTEM
ONLINE
ONLINE
ONLINE
ONLINE
已选择5行。
已用时间: 00: 00: 01.09
00:39:08 SQL>
SQL> set feedback on
SQL> set colsep |SQL> set pagesize 10
SQL> set serveroutput onSQL> set heading on
SQL> set timing on
SQL> set time on00:54:11
SQL> SELECT FILE#, STATUS, ENABLED FROM V$DATAFILE;
FILE#|STATUS |ENABLED———-|——-|———-
1|SYSTEM |READ WRITE
2|ONLINE |READ WRITE
3|ONLINE |READ WRITE
4|ONLINE |READ WRITE
5|ONLINE |READ WRITE
6|ONLINE |READ WRITE
7|ONLINE |READ WRITE
FILE#|STATUS |ENABLED———-|——-|———-
9|ONLINE |READ WRITE
10|ONLINE |READ WRITE
11|ONLINE |READ WRITE
12|ONLINE |READ WRITE11 rows selected.
Elapsed: 00:00:01.0700:54:34
SQL> DECLARE
00:55:00 2 BEGIN
00:55:00 3 DBMS_OUTPUT.PUT_LINE(’===This is dbms_output.put_line!===’);
00:55:00 4 END;
00:55:02 5 /
===This is dbms_output.put_line!===
PL/SQL procedure successfully completed.
Elapsed: 00:00:00.0200:55:05 SQL>
SQL> set autotrace on
SQL> SELECT E.LAST_NAME, D.DEPARTMENT_NAME, D.LOCATION_ID
2 FROM HR.EMPLOYEES E
3 JOIN HR.DEPARTMENTS D
4 USING (DEPARTMENT_ID);
LAST_NAME DEPARTMENT_NAME LOCATION_ID
————————- —————————— ———–
King Executive 1700
Kochhar Executive 1700
De Haan Executive 1700
Hunold IT 1400
Ernst IT 1400……
106 rows selected.
Execution Plan
———————————————————-
0 SELECT STATEMENT Optimizer=CHOOSE (Cost=5 Card=106 Bytes=318
0)
1 0 HASH JOIN (Cost=5 Card=106 Bytes=3180)
2 1 TABLE ACCESS (FULL) OF ‘DEPARTMENTS’ (Cost=2 Card=27 Byt
es=513)
3 1 TABLE ACCESS (FULL) OF ‘EMPLOYEES’ (Cost=2 Card=107 Byte
s=1177)
Statistics
———————————————————-
7 recursive calls
0 db block gets
23 consistent gets
12 physical reads
0 redo size
2801 bytes sent via SQL*Net to client
580 bytes received via SQL*Net from client
9 SQL*Net roundtrips to/from client
0 sorts (memory)
0 sorts (disk)
106 rows processed
SQL>
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