实验验证sys和system用户全库导出的区别

--创建directory
$ mkdir -p /public/xdump
SQL> create directory xdump as '/public/xdump';

--sys用户导出全库，sys导入指定sqlfile参数，生成脚本后续对比使用
$ expdp \'/ as sysdba\' directory=xdump dumpfile=full_sys_%U.dmp logfile=full_sys.log full=y parallel=2
$ impdp \'/ as sysdba\' directory=xdump dumpfile=full_sys_%U.dmp logfile=full_sys_impdp.log full =y sqlfile=full_sys.sql

--system用户导出全库，system导入指定sqlfile参数，生成脚本后续对比使用
$ expdp system directory=xdump dumpfile=full_system_%U.dmp logfile=full_system.log full=y parallel=2
$ impdp system directory=xdump dumpfile=full_system_%U.dmp logfile=full_system_impdp.log full =y sqlfile=full_system.sql

[oracle@rac1-server xdump]$ ls -lrth
total 801M
-rw-rw---- 1 501 1000 7.4M Jun  2 13:37 full_system_02.dmp
-rw-rw---- 1 501 1000 376M Jun  2 13:37 full_system_01.dmp
-rw-rw---- 1 501 1000 7.4M Jun  2 13:37 full_sys_02.dmp
-rw-rw---- 1 501 1000 376M Jun  2 13:37 full_sys_01.dmp
-rw-rw-rw- 1 501 1000  81K Jun  2 13:37 full_sys.log
-rw-rw-rw- 1 501 1000  81K Jun  2 13:37 full_system.log
-rw-rw-rw- 1 501 1000  18M Jun  2 13:40 full_sys.sql
-rw-rw-rw- 1 501 1000 4.9K Jun  2 13:40 full_sys_impdp.log
-rw-rw-rw- 1 501 1000  18M Jun  2 13:40 full_system.sql
-rw-rw-rw- 1 501 1000 5.0K Jun  2 13:40 full_system_impdp.log

#----sys 用户创建
--table&index
create table sys_test as select * from dba_objects;
create index idx_sys_test on sys_test(object_id);

--table&trigger
create table sys_emp as select * from scott.emp;

create table sys_aud_salary_history(
empno NUMBER(4),
old_sal NUMBER(7,2),
new_sal NUMBER(7,2),
change_time varchar2(50)
);

create or replace trigger tri_sys_sal after update
on sys_emp
    for each row
begin
    insert into sys_aud_salary_history VALUES
  (:OLD.empno, :OLD.sal, :NEW.sal, TO_CHAR(SYSDATE, 'yyyy-mm-dd hh24:mi:ss'));
end;
/
--这里发现sys用户无法创建owner为sys的触发器，忽略。

--synonym
create synonym sysemp for scott.emp;
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#----system 用户创建
conn system/oracle

--table&index
create table system_test as select * from dba_objects;
create index idx_system_test on system_test(object_id);

--table&trigger
create table system_emp as select * from scott.emp;

create table system_aud_salary_history(
empno NUMBER(4),
old_sal NUMBER(7,2),
new_sal NUMBER(7,2),
change_time varchar2(50)
);

create or replace trigger tri_system_sal after update
on system_emp
    for each row
begin
    insert into system_aud_salary_history VALUES
  (:OLD.empno, :OLD.sal, :NEW.sal, TO_CHAR(SYSDATE, 'yyyy-mm-dd hh24:mi:ss'));
end;
/

--synonym
create synonym systememp for scott.emp;