Oracle导出数据中的prompt，set feedback 等是什么意思

https://www.cnblogs.com/AmatVictorialCuram/p/5904914.html

• prompt
  输出提示
• set feedback off
  用于关闭输出提示信息，当有大量执行语句时候，往往会关闭"输出提示信息功能"，此时就会用到set feedback off

• set define off
  用于替代变量：在SQLPlus中默认的"&"表示替代变量，只要在命令中出现该符号，SQLPlus就会要你输入替代值;
  因此如果我们输入的命令中如果包含该字符，就要进行设置(关闭替代变量功能)

  ---

• 实例代码

prompt PL/SQL Developer import file
prompt Created on 2017年11月11日 by Administrator
set feedback off
set define off
prompt Creating SYS_DEPARTMENT…
create table SYS_DEPARTMENT
(
  id            NUMBER not null,
  is_deleted    VARCHAR2(1) default 'n',
  gmt_create    DATE default SYSDATE,
  creator        VARCHAR2(32),
  gmt_modify    DATE,
  modifier      VARCHAR2(32),
  parent_id      NUMBER,
  dept_name      VARCHAR2(64),
  dept_type      VARCHAR2(10),
  tel            VARCHAR2(32),
  fax            VARCHAR2(32),
  address        VARCHAR2(512),
  org_code      VARCHAR2(12),
  sort_num      NUMBER,
  is_system      VARCHAR2(1),
  full_id_path  VARCHAR2(256),
  full_name_path VARCHAR2(2048),
  is_leaf        VARCHAR2(1) default 'y',
  org_level      NUMBER,
  gmt_deleted    DATE
)
tablespace SMB_DATA
  pctfree 10
  initrans 1
  maxtrans 255;
comment on table SYS_DEPARTMENT
  is '部门表';
comment on column SYS_DEPARTMENT.is_deleted
  is '删除标记 n 未删除 y 删除';
comment on column SYS_DEPARTMENT.parent_id
  is '上级部门id';
comment on column SYS_DEPARTMENT.dept_name
  is '部门名称';
comment on column SYS_DEPARTMENT.address
  is '地址';
comment on column SYS_DEPARTMENT.sort_num
  is '排序';
comment on column SYS_DEPARTMENT.is_system
  is '是否系统预设部门  预设部门不能删除  ‘y’ 是  ‘n’  否';
comment on column SYS_DEPARTMENT.full_id_path
  is 'id完整路径  以''/''记录树节点的id路径  格式 1/2/5';
comment on column SYS_DEPARTMENT.full_name_path
  is '以''/''记录树节点的dept_name路径  如：杭州市对外经济贸易合作局/外促出';
comment on column SYS_DEPARTMENT.is_leaf
  is '是否叶子节点';
comment on column SYS_DEPARTMENT.org_level
  is '等级';
comment on column SYS_DEPARTMENT.gmt_deleted
  is '删除时间';
alter table SYS_DEPARTMENT
  add constraint PK_SYS_DEPARTMENT primary key (ID)
  using index 
  tablespace SMB_DATA
  pctfree 10
  initrans 2
  maxtrans 255;

set feedback on
set define on