oracle pkg 闪回,oracle10G闪回操作

最新推荐文章于 2024-07-27 16:50:15 发布

转载最新推荐文章于 2024-07-27 16:50:15 发布 · 105 阅读

文章标签：

这篇博客展示了如何使用Oracle数据库的闪回功能来恢复数据。通过ALTER TABLE启用行移动，然后进行INSERT、DELETE操作，并利用TO_TIMESTAMP进行时间戳闪回和SCN系统改变号闪回，展示了数据库版本控制的强大能力。

好久没有写blog了，好有亲切感，一次闪回的测试，共享一下，呵呵

SQL> alter table emp enable row movement;

Table altered

SQL> insert into emp select * from scott.emp;

14 rows inserted

SQL> commit;

Commit complete

SQL> select sysdate from dual;

SYSDATE

--------------------

2007-3-11 17:59:56

SQL> delete from emp where rownum<10;

9 rows deleted

SQL> commit;

Commit complete

SQL> select * from emp;

EMPNO ENAME JOB MGR HIREDATE SAL COMM DEPTNO

----- ---------- --------- ----- ----------- --------- --------- ------

7876 ADAMS CLERK 7788 1987-5-23 1100.00 20

7900 JAMES CLERK 7698 1981-12-3 950.00 30

7902 FORD ANALYST 7566 1981-12-3 3000.00 20

7934 MILLER CLERK 7782 1982-1-23 1300.00 10

7369 SMITH CLERK 7902 1980-12-17 800.00 20

SQL> select sysdate from dual;

SYSDATE

--------------------

2007-3-11 18:00:22

SQL> delete from emp;

5 rows deleted

SQL> commit;

Commit complete

SQL> flashback table emp to timestamp to_timestamp('2007-3-11 18:00:22','yyyy-mm-dd hh24:mi:ss');

Done

SQL> select * from emp;

EMPNO ENAME JOB MGR HIREDATE SAL COMM DEPTNO

----- ---------- --------- ----- ----------- --------- --------- ------

7876 ADAMS CLERK 7788 1987-5-23 1100.00 20

7900 JAMES CLERK 7698 1981-12-3 950.00 30

7902 FORD ANALYST 7566 1981-12-3 3000.00 20

7934 MILLER CLERK 7782 1982-1-23 1300.00 10

7369 SMITH CLERK 7902 1980-12-17 800.00 20

SQL>

SQL> flashback table emp to timestamp to_timestamp('2007-3-11 17:59:56','yyyy-mm-dd hh24:mi:ss');

Done

SQL> select * from emp;

EMPNO ENAME JOB MGR HIREDATE SAL COMM DEPTNO

----- ---------- --------- ----- ----------- --------- --------- ------

7499 ALLEN SALESMAN 7698 1981-2-20 1600.00 300.00 30

7521 WARD SALESMAN 7698 1981-2-22 1250.00 500.00 30

7566 JONES MANAGER 7839 1981-4-2 2975.00 20

7654 MARTIN SALESMAN 7698 1981-9-28 1250.00 1400.00 30

7698 BLAKE MANAGER 7839 1981-5-1 2850.00 30

7782 CLARK MANAGER 7839 1981-6-9 2450.00 10

7788 SCOTT ANALYST 7566 1987-4-19 3000.00 20

7839 KING PRESIDENT 1981-11-17 5000.00 10

7844 TURNER SALESMAN 7698 1981-9-8 1500.00 0.00 30

7876 ADAMS CLERK 7788 1987-5-23 1100.00 20

7900 JAMES CLERK 7698 1981-12-3 950.00 30

7902 FORD ANALYST 7566 1981-12-3 3000.00 20

7934 MILLER CLERK 7782 1982-1-23 1300.00 10

7369 SMITH CLERK 7902 1980-12-17 800.00 20

14 rows selected

SQL>

SQL> flashback table emp to timestamp to_timestamp('2007-3-11 18:00:22','yyyy-mm-dd hh24:mi:ss');

Done

SQL> select * from emp;

EMPNO ENAME JOB MGR HIREDATE SAL COMM DEPTNO

----- ---------- --------- ----- ----------- --------- --------- ------

7876 ADAMS CLERK 7788 1987-5-23 1100.00 20

7900 JAMES CLERK 7698 1981-12-3 950.00 30

7902 FORD ANALYST 7566 1981-12-3 3000.00 20

7934 MILLER CLERK 7782 1982-1-23 1300.00 10

7369 SMITH CLERK 7902 1980-12-17 800.00 20

SQL>

SQL> select dbms_flashback.get_system_change_number from dual;

GET_SYSTEM_CHANGE_NUMBER

------------------------

611375

SQL> select * from emp;

EMPNO ENAME JOB MGR HIREDATE SAL COMM DEPTNO

----- ---------- --------- ----- ----------- --------- --------- ------

7876 ADAMS CLERK 7788 1987-5-23 1100.00 20

7900 JAMES CLERK 7698 1981-12-3 950.00 30

7902 FORD ANALYST 7566 1981-12-3 3000.00 20

7934 MILLER CLERK 7782 1982-1-23 1300.00 10

7369 SMITH CLERK 7902 1980-12-17 800.00 20

SQL> delete from emp;

5 rows deleted

SQL> select dbms_flashback.get_system_change_number from dual;

GET_SYSTEM_CHANGE_NUMBER

------------------------

611383

SQL>

SQL> flashback table emp to scn 611375;

Done

SQL> select * from emp;

EMPNO ENAME JOB MGR HIREDATE SAL COMM DEPTNO

----- ---------- --------- ----- ----------- --------- --------- ------

7876 ADAMS CLERK 7788 1987-5-23 1100.00 20

7900 JAMES CLERK 7698 1981-12-3 950.00 30

7902 FORD ANALYST 7566 1981-12-3 3000.00 20

7934 MILLER CLERK 7782 1982-1-23 1300.00 10

7369 SMITH CLERK 7902 1980-12-17 800.00 20

SQL>