复习闪回功能
首先要开启归档与闪回
G:\Tools\ha_powercmd>sqlplus "/as sysdba" SQL*Plus: Release 11.2.0.1.0 Production on Wed Aug 21 08:43:04 2013 Copyright (c) 1982, 2010, Oracle. All rights reserved. Connected to: Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - Production With the Partitioning, OLAP, Data Mining and Real Application Testing options SQL> archive log list Database log mode No Archive Mode Automatic archival Disabled Archive destination D:\app\Administrator\product\11.2.0\dbhome_1\RDBMS Oldest online log sequence 3 Current log sequence 5 SQL> shutdown immediate Database closed. Database dismounted. ORACLE instance shut down. SQL> startup mount ORACLE instance started. Total System Global Area 778387456 bytes Fixed Size 1374808 bytes Variable Size 234882472 bytes Database Buffers 536870912 bytes Redo Buffers 5259264 bytes Database mounted. SQL> alter database archivelog; Database altered. SQL> alter database flashback on; alter database flashback on * ERROR at line 1: ORA-38706: Cannot turn on FLASHBACK DATABASE logging. ORA-38709: Recovery Area is not enabled. s\orcl\orcl\trace SQL> show parameter db_recover NAME TYPE VALUE ------------------------------------ ----------- ------------------------------ db_recovery_file_dest string db_recovery_file_dest_size big integer 0 SQL> alter system set DB_RECOVERY_FILE_DEST_SIZE=2g; System altered. SQL> alter system set db_recovery_file_dest='J:\orcl\orcl\flash_recovery_area'; System altered. SQL> alter database flashback on; Database altered. SQL> alter database open; Database altered.
更改归档路径
SQL> select file_type from v$flash_recovery_area_usage; FILE_TYPE -------------------- CONTROL FILE REDO LOG ARCHIVED LOG BACKUP PIECE IMAGE COPY FLASHBACK LOG FOREIGN ARCHIVED LOG 7 rows selected. SQL> alter system set log_archive_dest_1='location=J:\orcl\orcl\log'; System altered. SQL> alter system archive log current; System altered. SQL> select name from v$archived_log; NAME ----------------------------------------------- J:\ORCL\ORCL\LOG\ARC0000000005_0824025384.0001 SQL> alter system archive log current; System altered. SQL> select name from v$archived_log; NAME ----------------------------------------------- J:\ORCL\ORCL\LOG\ARC0000000005_0824025384.0001 J:\ORCL\ORCL\LOG\ARC0000000006_0824025384.0001 SQL> exit
Flashback Drop
G:\Tools\ha_powercmd>sqlplus test/test
SQL> create table test as select * from scott.dept;
Table created.
SQL> drop table test;
Table dropped.
SQL> flashback table test to before drop;
Flashback complete.
SQL> select deptno from test;
DEPTNO
----------
10
20
30
40
SQL> select * from test1;
select * from test1
*
ERROR at line 1:
ORA-00942: table or view does not exist
SQL> drop table test;
Table dropped.
SQL> flashback table test to before drop rename to test1;
Flashback complete.
SQL> select * from test1;
DEPTNO DNAME LOC
---------- -------------- -------------
10 ACCOUNTING NEW YORK
20 RESEARCH DALLAS
30 SALES CHICAGO
40 OPERATIONS BOSTON
/*关闭回收站*/
SQL> alter system set recyclebin=off deferred;
SQL> alter session set recyclebin=off;
Flashback Table
SQL> alter session set nls_date_format="yyyy-mm-dd hh24:mi:ss";
SQL> create table test as select sysdate as t1 from dual;
Table created.
SQL> insert into test values(sysdate);
1 row created.
SQL> commit;
Commit complete.
SQL> insert into test values(sysdate);
1 row created.
SQL> commit;
Commit complete.
SQL> insert into test values(sysdate);
1 row created.
SQL> commit;
Commit complete.
SQL> select * from test;
T1
-------------------
2013-08-21 09:39:19
2013-08-21 09:39:29
2013-08-21 09:39:35
2013-08-21 09:39:38
SQL> select versions_starttime,
2 VERSIONS_STARTSCN,
3 t1,
4 versions_endtime,
5 VERSIONS_ENDSCN
6 from test versions between timestamp minvalue and maxvalue
7 order by 1 desc nulls last;
VERSIONS_STARTTIME VERSIONS_STARTSCN T1 VERSIONS_ENDTIME VERSIONS_ENDSCN
------------------------ ----------------- ------------------- ---------------- -----------
21-AUG-13 09.39.36 AM 1041514 2013-08-21 09:39:38
21-AUG-13 09.39.36 AM 1041512 2013-08-21 09:39:35
21-AUG-13 09.39.30 AM 1041509 2013-08-21 09:39:29
2013-08-21 09:39:19
SQL> select * from test as of timestamp to_timestamp('2013-08-21 09:39:38','yyyy-mm-dd hh24:mi:ss');
T1
-------------------
2013-08-21 09:39:19
2013-08-21 09:39:29
SQL> select * from test as of timestamp to_timestamp('2013-08-21 09:39:39','yyyy-mm-dd hh24:mi:ss');
T1
-------------------
2013-08-21 09:39:19
2013-08-21 09:39:29
2013-08-21 09:39:35
2013-08-21 09:39:38
SQL> select * from test as of scn 1041509;
T1
-------------------
2013-08-21 09:39:19
2013-08-21 09:39:29
SQL> select * from test as of scn 1041514;
T1
-------------------
2013-08-21 09:39:19
2013-08-21 09:39:29
2013-08-21 09:39:35
2013-08-21 09:39:38
SQL> flashback table test to scn 1041513;
flashback table test to scn 1041513
*
ERROR at line 1:
ORA-08189: cannot flashback the table because row movement is not enabled
SQL> alter table test enable row movement;
Table altered.
SQL> flashback table test to scn 1041513;
Flashback complete.
SQL> select * from test;
T1
-------------------
2013-08-21 09:39:19
2013-08-21 09:39:29
2013-08-21 09:39:35
SQL> flashback table test to timestamp to_timestamp('2013-08-21 09:39:34','yyyy-mm-dd hh24:mi:ss');
Flashback complete.
SQL> select * from test;
T1
-------------------
2013-08-21 09:39:19
2013-08-21 09:39:29