闪回数据归档实验（Flashback Data Archive）

最新推荐文章于 2021-04-06 18:39:59 发布

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本文介绍Oracle数据库中闪回数据归档的功能，演示如何创建闪回数据归档并将其应用于表，即使在表被截断后仍能进行历史数据查询。

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闪回数据归档实验（Flashback Data Archive）

使用环境
--11g开始有此功能

--12c需要数据库没有插件库或版本为12.1.0.2及以后的版本

实验

--创建表空间用来存放闪回数据归档
SYS@PROD1> create tablespace fda datafile '/u01/app/oracle/oradata/PROD1/fda01.dbf' size 10m autoextend on;

Tablespace created.

--建立闪回数据归档，并指定保留时间
SYS@PROD1> create flashback archive fda tablespace fda quota 10m retention 1 month;

Flashback archive created.

--赋予权限，可以通过sys直接赋予表FDA权限或者给予用户FDA权限
SYS@PROD1> alter table scott.emp flashback archive fda;

Table altered.

SYS@PROD1> grant flashback archive administer to scott;

Grant succeeded.

--通过视图查看是否打开闪回视图归档
SCOTT@PROD1> desc user_flashback_archive_tables 
 Name						       Null?	Type
 ----------------------------------------------------- -------- ------------------------------------
 TABLE_NAME					       NOT NULL VARCHAR2(30)
 OWNER_NAME					       NOT NULL VARCHAR2(30)
 FLASHBACK_ARCHIVE_NAME 			       NOT NULL VARCHAR2(255)
 ARCHIVE_TABLE_NAME						VARCHAR2(53)
 STATUS 							VARCHAR2(13)

SCOTT@PROD1> select * from user_flashback_archive_tables where table_name='EMP';

TABLE_NAME		       OWNER_NAME
------------------------------ ------------------------------
FLASHBACK_ARCHIVE_NAME
----------------------------------------------------------------------------------------------------
ARCHIVE_TABLE_NAME				      STATUS
----------------------------------------------------- -------------
EMP			       SCOTT
FDA
SYS_FBA_HIST_75315				      ENABLED

--即使截断表也能闪回查询记录
SCOTT@PROD1> select * from emp as of timestamp sysdate-1/1440;

     EMPNO ENAME      JOB	       MGR HIREDATE	    SAL       COMM     DEPTNO
---------- ---------- --------- ---------- --------- ---------- ---------- ----------
      7934 MILLER     CLERK	      7782 23-JAN-82	   1301 		   10
      7902 FORD       ANALYST	      7566 03-DEC-81	   3001 		   20
      7900 JAMES      CLERK	      7698 03-DEC-81	    951 		   30
      7876 ADAMS      CLERK	      7788 23-MAY-87	   1101 		   20
      7844 TURNER     SALESMAN	      7698 08-SEP-81	   1501 	 0	   30
      7839 KING       PRESIDENT 	   17-NOV-81	   5001 		   10
      7788 SCOTT      ANALYST	      7566 19-APR-87	   3001 		   20
      7782 CLARK      MANAGER	      7839 09-JUN-81	   2451 		   10
      7698 BLAKE      MANAGER	      7839 01-MAY-81	   2851 		   30
      7654 MARTIN     SALESMAN	      7698 28-SEP-81	   1251       1400	   30
      7566 JONES      MANAGER	      7839 02-APR-81	   2976 		   20
      7521 WARD       SALESMAN	      7698 22-FEB-81	   1251        500	   30
      7499 ALLEN      SALESMAN	      7698 20-FEB-81	   1601        300	   30
      7369 SMITH      CLERK	      7902 17-DEC-80	    801 		   20

14 rows selected.

SCOTT@PROD1> truncate table emp;

Table truncated.

SCOTT@PROD1> select * from emp as of timestamp sysdate-1/1440;

     EMPNO ENAME      JOB	       MGR HIREDATE	    SAL       COMM     DEPTNO
---------- ---------- --------- ---------- --------- ---------- ---------- ----------
      7934 MILLER     CLERK	      7782 23-JAN-82	   1301 		   10
      7902 FORD       ANALYST	      7566 03-DEC-81	   3001 		   20
      7900 JAMES      CLERK	      7698 03-DEC-81	    951 		   30
      7876 ADAMS      CLERK	      7788 23-MAY-87	   1101 		   20
      7844 TURNER     SALESMAN	      7698 08-SEP-81	   1501 	 0	   30
      7839 KING       PRESIDENT 	   17-NOV-81	   5001 		   10
      7788 SCOTT      ANALYST	      7566 19-APR-87	   3001 		   20
      7782 CLARK      MANAGER	      7839 09-JUN-81	   2451 		   10
      7698 BLAKE      MANAGER	      7839 01-MAY-81	   2851 		   30
      7654 MARTIN     SALESMAN	      7698 28-SEP-81	   1251       1400	   30
      7566 JONES      MANAGER	      7839 02-APR-81	   2976 		   20
      7521 WARD       SALESMAN	      7698 22-FEB-81	   1251        500	   30
      7499 ALLEN      SALESMAN	      7698 20-FEB-81	   1601        300	   30
      7369 SMITH      CLERK	      7902 17-DEC-80	    801 		   20

14 rows selected.

--直接插入就可恢复
SCOTT@PROD1> insert into emp select * from emp as of timestamp sysdate-1;

14 rows created.

--一旦表被放到FDA，将不允许直接把表删除，除非关闭FDA
SCOTT@PROD1> drop table emp;
drop table emp
           *
ERROR at line 1:
ORA-55610: Invalid DDL statement on history-tracked table

SCOTT@PROD1> alter table emp no flashback archive;

Table altered.

SCOTT@PROD1> drop table emp;

Table dropped.