数据库归档以及flashbak

数据库归档以及flashbak
1：列出归档信息日志
SQL> archive log list;
Database log mode Archive Mode
Automatic archival Enabled
Archive destination USE_DB_RECOVERY_FILE_DEST
Oldest online log sequence 4
Next log sequence to archive 6
Current log sequence 6

2:查看归档日志位置
SQL> select name,value from v$parameter where name =’log_archive_dest1’;
SQL>select name,value from v$parameter where name=’log_archive_format’;
SQL>select name,value from v$parameter where name=’db_recovery_file_dest’;
SQL> select value from v$parameter where name='db_recovery_file_dest';
或SQL>show parameter db_recovery_file_dest;
Db_recovery_file_dest string /ora10gBase/flashback_recovery_area
Db_recovery_file_dest_size integer 2G

VALUE
--------------------------------------------------------------------------------
/ora10gBase/flash_recovery_area

3: 将归档日志根据日期存放在不同子目录下
• /oradata/[SID]/archivelog/[yyyy-mm-dd]/.arc
SQL>alter system set archive_log_format=’/oradata/[SID]/archivelog/[yyyy-mm-dd]/.arc

4:flashback 操作
– 启动flashback
– 加大UNDO_RETENTION的值86400
– 使用Flashback恢复一个被删除的表
• 设置数据库参数，
– 启动归档日志和闪回
» 设置需要闪回的表属性options
– Enable Row Movement -> yes
• 闪回表
– 删除一个表中的记录delete from scott.dept，再闪回
• 执行Flashback Versions Query
– 修改一条记录，再闪回
SQL>shutdown immediate;
SQL> startup mount exclusive;
ORACLE instance started.

Total System Global Area 197132288 bytes
Fixed Size 1218484 bytes
Variable Size 67110988 bytes
Database Buffers 125829120 bytes
Redo Buffers 2973696 bytes
Database mounted.
SQL> alter system set recyclebin=on scope=both;--开启recyclebin

System altered.

SQL> alter system set db_flashback_retention_target=14400 scope=both;

System altered.
SQL> alter database archivelog;

Database altered.

SQL> alter database flashback on;

Database altered.

SQL> alter database open;

Database altered.

SQL> archive log list;
Database log mode Archive Mode
Automatic archival Enabled
Archive destination USE_DB_RECOVERY_FILE_DEST
Oldest online log sequence 4
Next log sequence to archive 6
Current log sequence 6
--修改undo_retention 为20分钟
SQL> select 20*60*60 from dual;

20*60*60
----------
72000

SQL> alter system set undo_retention=72000 scope=both;

System altered.
--解锁用户scott 进行相关的增加，删除，更新操作
SQL> alter user scott identified by tiger account unlock;

User altered.

SQL> grant resource to scott;

Grant succeeded.

SQL> conn scott/tiger;
Connected.

SQL> alter user scott identified by tiger account unlock;

User altered.

SQL> grant resource to scott;

Grant succeeded.

SQL> conn scott/tiger;
Connected.

--进行flashback操作之前，需要先把row movement 打开
SQL>alter table dept enable row movement;

---进行更新删除操c作

SQL> create table test(id number(4),name varchar2(30));

Table created.

SQL> insert into test values(1,'TEST');

1 row created.

SQL> insert into test values(2,'Fuck');

1 row created.

SQL> commit;

Commit complete.

SQL> drop table test;

Table dropped.

SQL> show recyclebin;
ORIGINAL NAME RECYCLEBIN NAME OBJECT TYPE DROP TIME
---------------- ------------------------------ ------------ -------------------
TEST BIN$Xkza01ABRArgQAB/AQARTw==$0 TABLE 2008-12-18:15:08:08

---从recyclebin中查询被删除的数据信息
SQL> select * from "BIN$Xkza01ABRArgQAB/AQARTw==$0";

ID NAME
---------- ------------------------------
1 TEST
2 Fuck
--从recyvlebin中恢复被删除的表
SQL> flashback table test to before drop;

Flashback complete.

SQL> select table_name from user_tables;

TABLE_NAME
------------------------------
DEPT
EMP
BONUS
SALGRADE
TEST
--恢复后recyclebin中的信息也相应的消失啦
SQL> show recyclebin;

4:purge 表操作