Oracle 闪回数据库测试

2022 年 02 月 25 日

329 次浏览

3130字数

1 设置闪回目录和大小

SQL> show parameter recover
SQL> alter system set db_recovery_file_dest_size=5g;
SQL> alter system set db_recovery_file_dest='/fast_recovery';
SQL> show parameter recover
NAME     TYPE VALUE
------------------------------------ ----------- ------------------------------
db_recovery_file_dest     string /fast_recovery
db_recovery_file_dest_size     big integer 5G
db_unrecoverable_scn_tracking     boolean TRUE
recovery_parallelism     integer 0

2 启用闪回

SQL> select flashback_on from v$database;
FLASHBACK_ON
------------------
NO
SQL> alter database flashback on;
Database altered.
SQL> select flashback_on from v$database;
FLASHBACK_ON
------------------
YES

3 查看时间

SQL> alter session set nls_date_format='yyyy-mm-dd hh24:mi:ss';
Session altered.
SQL> select oldest_flashback_scn,oldest_flashback_time from v$flashback_database_log;
OLDEST_FLASHBACK_SCN OLDEST_FLASHBACK_TI
-------------------- -------------------
     1114453 2020-06-24 08:30:49

4 创建测试数据

SQL> conn cjc/cjc
SQL> create table test1 as select * from dba_objects;
SQL> select count(*) from test1;
  COUNT(*)
----------
     87002

5 创建闪回点

SQL> create restore point test1;    
Restore point created.

6 查看闪回点

SQL> set line 200
SQL> col time for a50            
SQL> col restore_point_time for a20
SQL> alter session set nls_date_format='yyyy-mm-dd hh24:mi:ss';
SQL> select scn,time,restore_point_time,name from v$restore_point;
       SCN TIME       RESTORE_POINT_TIME   NAME
---------- -------------------------------------------------- -------------------- ------------------------------
   1114756 24-JUN-20 08.36.20.000000000 AM   TEST1

7 继续插入数据

SQL> ho date
Wed Jun 24 08:39:31 CST 2020
SQL> insert into test1 select * from test1;
87002 rows created.
SQL> commit;
Commit complete.
SQL> select count(*) from test1;
  COUNT(*)
----------
    174004

8 删除表

SQL> drop table test1 purge;
Table dropped.
SQL> select count(*) from cjc.test1;
select count(*) from cjc.test1
                         *
ERROR at line 1:
ORA-00942: table or view does not exist

9 闪回数据库
---test1是之前设置的闪回点名称

SQL> conn / as sysdba
SQL> shutdown immediate
SQL> startup mount
SQL> flashback database to restore point test1;
Flashback complete.
SQL> alter database open resetlogs;

10 查看数据，数据库恢复到闪回点时刻

SQL> select count(*) from cjc.test1;
  COUNT(*)
----------
     87002

11 查看闪回数据

[oracle@cjcos01 flashback]$ pwd
/fast_recovery/CJCDB01/flashback
[oracle@cjcos01 flashback]$ ll -rth
total 101M
-rw-r----- 1 oracle oinstall 51M Jun 24 08:30 o1_mf_hh57ow2w_.flb
-rw-r----- 1 oracle oinstall 51M Jun 24 08:49 o1_mf_hh57osvt_.flb

12 关闭闪回，闪回日志自动删除

SQL> alter database flashback off;
Database altered.
SQL> select flashback_on from v$database;
FLASHBACK_ON
------------------
NO
[oracle@cjcos01 flashback]$ ls

转载自chenoracle

Oracle 闪回数据库测试