oracle11G闪回flashback

oracle11G闪回flashback

oracle9i的闪回：

闪回查询从9i引入，可以按照时间点或者SCN向前查

询，获取修改 前的数据。

闪回查询依赖于回滚段中存储的数据前镜像，通过设置

undo_retention参数设置前镜像的保留时间。

查询的语法：

select … as of scn | timestamp

Connected to Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 Connected as hr@JIAGULUN SQL> select * from student; ID NAME AGE ----------- -------------------- ----------- 1 zhangsan 21 2 lisi 22 3 wangwu 23 SQL> select to_char(sysdate,'yyyymmdd hh24:mi:ss') from dual; TO_CHAR(SYSDATE,'YYYYMMDDHH24: ------------------------------ 20150124 17:58:58 SQL> SQL> update student s set s.name='mazi' where s.id = 1; 1 row updated SQL> select to_char(sysdate,'yyyymmdd hh24:mi:ss') from dual; TO_CHAR(SYSDATE,'YYYYMMDDHH24: ------------------------------ 20150124 18:02:56 SQL> delete from student s where s.name = 'lisi'; 1 row deleted SQL> select * from student; ID NAME AGE ----------- -------------------- ----------- 1 mazi 21 3 wangwu 23 SQL> select to_char(sysdate,'yyyymmdd hh24:mi:ss') from dual; TO_CHAR(SYSDATE,'YYYYMMDDHH24: ------------------------------ 20150124 18:04:00 SQL> delete from student; 2 rows deleted SQL> select * from student; ID NAME AGE ----------- -------------------- ----------- SQL> select to_char(sysdate,'yyyymmdd hh24:mi:ss') from dual; TO_CHAR(SYSDATE,'YYYYMMDDHH24: ------------------------------ 20150124 18:04:26 SQL> select * from student as of scn 3099731; ID NAME AGE ----------- -------------------- ----------- 1 zhangsan 21 2 lisi 22 3 wangwu 23 SQL> select * from student; ID NAME AGE ----------- -------------------- ----------- SQL> commit; Commit complete SQL> insert into student values(1,'zhangsan',23); 1 row inserted SQL> commit; Commit complete SQL> SQL> select to_char(sysdate,'yyyymmdd hh24:mi:ss') from dual; TO_CHAR(SYSDATE,'YYYYMMDDHH24: ------------------------------ 20150124 19:36:30 SQL> SQL> delete from student; 1 row deleted SQL> commit; Commit complete SQL> select to_char(sysdate,'yyyymmdd hh24:mi:ss') from dual; TO_CHAR(SYSDATE,'YYYYMMDDHH24: ------------------------------ 20150124 19:36:51 SQL> select * from student as of timestamp to_date('20150124 19:36:30','yyyymmdd hh24:mi:ss'); ID NAME AGE ----------- -------------------- ----------- 1 zhangsan 23 SQL> select * from student as of timestamp to_date('20150124 18:04:26','yyyymmdd hh24:mi:ss'); ID NAME AGE ----------- -------------------- ----------- 1 zhangsan 21 2 lisi 22 3 wangwu 23 SQL>

oracle10g的闪回版本查询：

对于9i的闪回查询进行增强，Oracle10g提供了闪回版本

查询，因为9i的闪回查询仅仅能够得到过去某个时间点上的

数据，但是无法反映出一段时间内数据表中数据的变化，

10g的闪回版本查询可以对时间段内数据表的不同版本进行

查询。

闪回版本查询的语法：

select … from … versions between

其中，select后面可以选择伪列，来获得事务的开始、结

束时间、SCN号、ID号等。

SQL> select to_char(sysdate,'yyyymmdd hh24:mi:ss') from dual; TO_CHAR(SYSDATE,'YYYYMMDDHH24: ------------------------------ 20150124 19:40:11 SQL> select dbms_flashback.get_system_change_number from dual; GET_SYSTEM_CHANGE_NUMBER ------------------------ 使用上面的系统包必须赋予权限：grant execute on dbms_flashback to hr; 3115836 SQL> SQL> insert into student values(1,'zhangsan',23); 1 row inserted SQL> commit; Commit complete SQL> select to_char(sysdate,'yyyymmdd hh24:mi:ss') from dual; TO_CHAR(SYSDATE,'YYYYMMDDHH24: ------------------------------ 20150124 19:51:36 SQL> select dbms_flashback.get_system_change_number from dual; GET_SYSTEM_CHANGE_NUMBER ------------------------ 3115938 SQL> update student s set s.name='wangwu' where s.id = 1; 1 row updated SQL> commit; Commit complete SQL> select dbms_flashback.get_system_change_number from dual; GET_SYSTEM_CHANGE_NUMBER ------------------------ 3115954 SQL> select to_char(sysdate,'yyyymmdd hh24:mi:ss') from dual; TO_CHAR(SYSDATE,'YYYYMMDDHH24: ------------------------------ 20150124 19:52:26 SQL> insert into student values (2,'mazi',24); 1 row inserted SQL> commit; Commit complete SQL> select to_char(sysdate,'yyyymmdd hh24:mi:ss') from dual; TO_CHAR(SYSDATE,'YYYYMMDDHH24: ------------------------------ 20150124 19:52:58 SQL> select dbms_flashback.get_system_change_number from dual; GET_SYSTEM_CHANGE_NUMBER ------------------------ 3116062 SQL> SQL> select versions_starttime,versions_endtime,versions_xid,versions_operation,id,name,age from student 2 versions between scn minvalue and maxvalue; VERSIONS_STARTTIME VERSIONS_ENDTIME VERSIONS_XID VERSIONS_OPERATION ID NAME AGE -------------------------------------------------------------------------------- -------------------------------------------------------------------------------- ---------------- ------------------ ----------- -------------------- ----------- 24-1月 -15 07.52.54 下午 0B00080005010000 I 2 mazi 24 24-1月 -15 07.52.15 下午 13000100FE000000 U 1 wangwu 23 24-1月 -15 07.51.29 下午 24-1月 -15 07.52.15 下午 12001F00FF000000 I 1 zhangsan 23 SQL> SQL> select to_char( versions_starttime,'yyyymmdd hh24:mi:ss') ,to_char( versions_endtime,'yyyymmdd hh24:mi:ss'),versions_xid,versions_operation,id,name,age from student 2 versions between scn minvalue and maxvalue; TO_CHAR(VERSIONS_STARTTIME,'YY TO_CHAR(VERSIONS_ENDTIME,'YYYY VERSIONS_XID VERSIONS_OPERATION ID NAME AGE ------------------------------ ------------------------------ ---------------- ------------------ ----------- -------------------- ----------- 20150124 19:52:54 0B00080005010000 I 2 mazi 24 20150124 19:52:15 13000100FE000000 U 1 wangwu 23 20150124 19:51:29 20150124 19:52:15 12001F00FF000000 I 1 zhangsan 23 SQL> SQL> select to_char( versions_starttime,'yyyymmdd hh24:mi:ss') ,to_char( versions_endtime,'yyyymmdd hh24:mi:ss'),versions_xid,versions_operation,id,name,age from student 2 versions between timestamp minvalue and maxvalue; TO_CHAR(VERSIONS_STARTTIME,'YY TO_CHAR(VERSIONS_ENDTIME,'YYYY VERSIONS_XID VERSIONS_OPERATION ID NAME AGE ------------------------------ ------------------------------ ---------------- ------------------ ----------- -------------------- ----------- 20150124 19:52:54 0B00080005010000 I 2 mazi 24 20150124 19:52:15 13000100FE000000 U 1 wangwu 23 20150124 19:51:29 20150124 19:52:15 12001F00FF000000 I 1 zhangsan 23 SQL> 过一段时间你会发现查询的结果变少了： SQL> select to_char( versions_starttime,'yyyymmdd hh24:mi:ss') ,to_char( versions_endtime,'yyyymmdd hh24:mi:ss'),versions_xid,versions_operation,id,name,age from student 2 versions between timestamp minvalue and maxvalue; TO_CHAR(VERSIONS_STARTTIME,'YY TO_CHAR(VERSIONS_ENDTIME,'YYYY VERSIONS_XID VERSIONS_OPERATION ID NAME AGE ------------------------------ ------------------------------ ---------------- ------------------ ----------- -------------------- ----------- 2 mazi 24 1 wangwu 23 SQL> 这是因为 undo_retention这个值设置的时间到期了。

oracle10g的闪回事务查询：

Oracle10g可以进行基于闪回版本查询的恢复，就是闪回事务查询。

从flashback_transaction_query中查询引起数据变化的

事务，和撤销事务的SQL语句，就是查询 operation和undo_sql列。

SQL> select xid,start_timestamp,operation,undo_sql from flashback_transaction_query where table_name='STUDENT'; XID START_TIMESTAMP OPERATION UNDO_SQL ---------------- --------------- -------------------------------- -------------------------------------------------------------------------------- 0F00020002010000 24-1月-15 20:32: UNKNOWN 0F00040002010000 24-1月-15 20:32: UNKNOWN 0F00040002010000 24-1月-15 20:32: UNKNOWN 13000100FE000000 24-1月-15 19:52: UNKNOWN 1400200004010000 24-1月-15 20:32: UNKNOWN 如上图所示的，但是这里查不出来奇怪了。。。。 通过undo_sql来进行回滚事务（就是再做次反向操作）

oracle10g的闪回表：

Oracle10g的闪回表是把表里的数据回退到以前的某个时

刻或者SCN上。

特点：可以在线操作；自动恢复相关的属性，包括索引、

触发器等。

前提：对表启用行迁移。

语法：

flashback table <table_name> to timestamp | scn

Connected as hr@JIAGULUN SQL> select * from student; ID NAME AGE ----------- -------------------- ----------- 3 zhangsan 21 SQL> alter table student enable row movement; Table altered SQL> select dbms_flashback.get_system_change_number from dual; GET_SYSTEM_CHANGE_NUMBER ------------------------ 3143334 SQL> delete from student where id in(1); 0 rows deleted SQL> delete from student where id in(3); 1 row deleted SQL> commit; Commit complete SQL> flashback table student to scn 3143334; Done SQL> select * from student; ID NAME AGE ----------- -------------------- ----------- 3 zhangsan 21 SQL>

注意：sys的表不能闪回。

Connected to Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 Connected as sys@JIAGULUN AS SYSDBA SQL> select * from student; ID NAME AGE ----------- -------------------- ----------- 1 zhangsan 20 2 lisi 21 3 wangwu 22 SQL> alter table student enable row movement; Table altered SQL> select dbms_flashback.get_system_change_number from dual; GET_SYSTEM_CHANGE_NUMBER ------------------------ 3142994 SQL> delete from student where id in(1,2); 2 rows deleted SQL> commit; Commit complete SQL> select * from student; ID NAME AGE ----------- -------------------- ----------- 3 wangwu 22 SQL> flashback table student to scn 3142994; flashback table student to scn 3142994 ORA-08185: 用户 SYS 不支持闪回 SQL> show user; User is "SYS" SQL>

oracle10g的闪回删除：

Oracle10g的闪回删除：可以恢复一个被drop的对象，因

为进行drop时，Oracle先把它放到回收站中。（回收站和操作系统的回收站很相似）

回收站内的信息：show recyclebin

闪回删除：flashback table <table_name> to before drop;

彻底删除：drop table <table_name> purge;

清空回收站: purge recyclebin;

Connected to Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 Connected as hr@JIAGULUN SQL> purge recyclebin; Done SQL> select * from tab; TNAME TABTYPE CLUSTERID ------------------------------ ------- ---------- ADDRESS TABLE SQL> select * from address; ID NAME ----------- -------------------- 1 jiangxi 2 hunan SQL> show recyclebin; SQL> select * from user_recyclebin; --回收站并没有任何垃圾 OBJECT_NAME ORIGINAL_NAME OPERATION TYPE TS_NAME CREATETIME DROPTIME DROPSCN PARTITION_NAME CAN_UNDROP CAN_PURGE RELATED BASE_OBJECT PURGE_OBJECT SPACE ------------------------------ -------------------------------- --------- ------------------------- ------------------------------ ------------------- ------------------- ---------- -------------------------------- ---------- --------- ---------- ----------- ------------ ---------- SQL> drop table address; --删除表 Table dropped SQL> show recyclebin; SQL> select * from user_recyclebin; --会发现回收站中出现了——表，索引垃圾 OBJECT_NAME ORIGINAL_NAME OPERATION TYPE TS_NAME CREATETIME DROPTIME DROPSCN PARTITION_NAME CAN_UNDROP CAN_PURGE RELATED BASE_OBJECT PURGE_OBJECT SPACE ------------------------------ -------------------------------- --------- ------------------------- ------------------------------ ------------------- ------------------- ---------- -------------------------------- ---------- --------- ---------- ----------- ------------ ---------- BIN$DXVcPQqfU6HgUKjAA1tAfw==$0ADDRESS DROP TABLE USERS 2015-01-22:06:10:58 2015-01-24:22:49:08 3145534 YES YES 77236 77236 77236 8 BIN$DXVcPQqeU6HgUKjAA1tAfw==$0 PK_ADDRESS DROP INDEX USERS 2015-01-22:06:10:58 2015-01-24:22:49:08 3145530 NO YES 77236 77236 77239 8 BIN$DXVcPQqdU6HgUKjAA1tAfw==$0 INDEX_ADDRESS_NAME DROP INDEX USERS 2015-01-22:06:10:58 2015-01-24:22:49:08 3145525 NO YES 77236 77236 77240 8 SQL> select * from tab; --刚刚存在address表不见了，但是多了一张下面的表 TNAME TABTYPE CLUSTERID ------------------------------ ------- ---------- BIN$DXVcPQqfU6HgUKjAA1tAfw==$0TABLE SQL> flashback table student to before drop; flashback table student to before drop ORA-38305: 对象不在回收站中 SQL> flashback table address to before drop; --对回收站的表进行闪回 Done SQL> select * from user_recyclebin; --回收站中的表被闪回了 OBJECT_NAME ORIGINAL_NAME OPERATION TYPE TS_NAME CREATETIME DROPTIME DROPSCN PARTITION_NAME CAN_UNDROP CAN_PURGE RELATED BASE_OBJECT PURGE_OBJECT SPACE ------------------------------ -------------------------------- --------- ------------------------- ------------------------------ ------------------- ------------------- ---------- -------------------------------- ---------- --------- ---------- ----------- ------------ ---------- SQL> select * from tab; --表被闪回了 TNAME TABTYPE CLUSTERID ------------------------------ ------- ---------- ADDRESS TABLE SQL> drop table address; Table dropped SQL> create table address(id number(10)); Table created SQL> insert into address values(1); 1 row inserted SQL> commit; Commit complete SQL> drop table address; Table dropped SQL> select * from user_recyclebin; --回收站中有两个address表 OBJECT_NAME ORIGINAL_NAME OPERATION TYPE TS_NAME CREATETIME DROPTIME DROPSCN PARTITION_NAME CAN_UNDROP CAN_PURGE RELATED BASE_OBJECT PURGE_OBJECT SPACE ------------------------------ -------------------------------- --------- ------------------------- ------------------------------ ------------------- ------------------- ---------- -------------------------------- ---------- --------- ---------- ----------- ------------ ---------- BIN$DXVcPQqkU6HgUKjAA1tAfw==$0 ADDRESS DROP TABLE USERS 2015-01-24:22:51:52 2015-01-24:22:52:19 3145976 YES YES 77424 77424 77424 8 BIN$DXVcPQqjU6HgUKjAA1tAfw==$0 ADDRESS DROP TABLE USERS 2015-01-22:06:10:58 2015-01-24:22:51:38 3145840 YES YES 77236 77236 77236 8 BIN$DXVcPQqiU6HgUKjAA1tAfw==$1 BIN$DXVcPQqeU6HgUKjAA1tAfw==$0 DROP INDEX USERS 2015-01-22:06:10:58 2015-01-24:22:51:38 3145836 NO YES 77236 77236 77239 8 BIN$DXVcPQqhU6HgUKjAA1tAfw==$1 BIN$DXVcPQqdU6HgUKjAA1tAfw==$0 DROP INDEX USERS 2015-01-22:06:10:58 2015-01-24:22:51:38 3145831 NO YES 77236 77236 77240 8 SQL> flashback table address to before drop; --闪回表 Done SQL> select * from user_recyclebin; OBJECT_NAME ORIGINAL_NAME OPERATION TYPE TS_NAME CREATETIME DROPTIME DROPSCN PARTITION_NAME CAN_UNDROP CAN_PURGE RELATED BASE_OBJECT PURGE_OBJECT SPACE ------------------------------ -------------------------------- --------- ------------------------- ------------------------------ ------------------- ------------------- ---------- -------------------------------- ---------- --------- ---------- ----------- ------------ ---------- BIN$DXVcPQqjU6HgUKjAA1tAfw==$0 ADDRESS DROP TABLE USERS 2015-01-22:06:10:58 2015-01-24:22:51:38 3145840 YES YES 77236 77236 77236 8 BIN$DXVcPQqiU6HgUKjAA1tAfw==$1 BIN$DXVcPQqeU6HgUKjAA1tAfw==$0 DROP INDEX USERS 2015-01-22:06:10:58 2015-01-24:22:51:38 3145836 NO YES 77236 77236 77239 8 BIN$DXVcPQqhU6HgUKjAA1tAfw==$1 BIN$DXVcPQqdU6HgUKjAA1tAfw==$0 DROP INDEX USERS 2015-01-22:06:10:58 2015-01-24:22:51:38 3145831 NO YES 77236 77236 77240 8 SQL> select * from address; --被闪回的表示最晚送到回收站的那张表 ID ----------- 1 SQL> SQL> drop table address purge; --删除表并不送入到回收站中 Table dropped SQL> select * from user_recyclebin; OBJECT_NAME ORIGINAL_NAME OPERATION TYPE TS_NAME CREATETIME DROPTIME DROPSCN PARTITION_NAME CAN_UNDROP CAN_PURGE RELATED BASE_OBJECT PURGE_OBJECT SPACE ------------------------------ -------------------------------- --------- ------------------------- ------------------------------ ------------------- ------------------- ---------- -------------------------------- ---------- --------- ---------- ----------- ------------ ---------- BIN$DXVcPQqjU6HgUKjAA1tAfw==$0 ADDRESS DROP TABLE USERS 2015-01-22:06:10:58 2015-01-24:22:51:38 3145840 YES YES 77236 77236 77236 8 BIN$DXVcPQqiU6HgUKjAA1tAfw==$1 BIN$DXVcPQqeU6HgUKjAA1tAfw==$0 DROP INDEX USERS 2015-01-22:06:10:58 2015-01-24:22:51:38 3145836 NO YES 77236 77236 77239 8 BIN$DXVcPQqhU6HgUKjAA1tAfw==$1 BIN$DXVcPQqdU6HgUKjAA1tAfw==$0 DROP INDEX USERS 2015-01-22:06:10:58 2015-01-24:22:51:38 3145831 NO YES 77236 77236 77240 8 SQL> SQL> flashback table address to before drop; --闪回原来存在于回收站的表 Done SQL> select * from user_recyclebin; OBJECT_NAME ORIGINAL_NAME OPERATION TYPE TS_NAME CREATETIME DROPTIME DROPSCN PARTITION_NAME CAN_UNDROP CAN_PURGE RELATED BASE_OBJECT PURGE_OBJECT SPACE ------------------------------ -------------------------------- --------- ------------------------- ------------------------------ ------------------- ------------------- ---------- -------------------------------- ---------- --------- ---------- ----------- ------------ ---------- SQL> select * from address; ID NAME ----------- -------------------- 1 jiangxi 2 hunan SQL>

通过参数 recyclebin 来启用、禁用回收站。

SQL> show parameter recycle; NAME TYPE VALUE ------------------------------------ ----------- ------------------------------ buffer_pool_recycle string db_recycle_cache_size big integer 0 recyclebin string on SQL> SQL> select * from address; ID NAME ----------- -------------------- 1 jiangxi 2 hunan SQL> alter session set recyclebin = off; --关闭回收站 Session altered SQL> drop table address; Table dropped SQL> select * from user_recyclebin; --回收站为空的 OBJECT_NAME ORIGINAL_NAME OPERATION TYPE TS_NAME CREATETIME DROPTIME DROPSCN PARTITION_NAME CAN_UNDROP CAN_PURGE RELATED BASE_OBJECT PURGE_OBJECT SPACE ------------------------------ -------------------------------- --------- ------------------------- ------------------------------ ------------------- ------------------- ---------- -------------------------------- ---------- --------- ---------- ----------- ------------ ---------- SQL>

闪回数据库：

如果数据库出现逻辑错误，无法采用闪回表的方式进行恢

复，或者数据库的结构发生了改变，可以通过闪回数据库的

方式把整个数据库回退到出错前的时间点上。步骤：

1，配置数据库为归档模式

2，配置闪回恢复区

3，配置闪回保留时间

4，启用数据库闪回 alter database flashback on;

5，进行闪回数据库

flashback database to timestamp |scn

SQL> show user USER is "SYS" SQL> archive log list;--查看是否是归档模式 Database log mode Archive Mode Automatic archival Enabled Archive destination /u01/app/oracle/archive/archive02/ Oldest online log sequence 362 Next log sequence to archive 365 Current log sequence 365 SQL> alter system set log_archive_start = false scope =spfile;--设置为不是自动归档（在9i后失效了，归档模式就是自动的） System altered. SQL> shutdown immediate--关闭数据库 Database closed. Database dismounted. ORACLE instance shut down. SQL> startup mount--打开数据库到mount状态 ORA-32004: obsolete or deprecated parameter(s) specified for RDBMS instance ORACLE instance started. Total System Global Area 400846848 bytes Fixed Size 2213776 bytes Variable Size 276826224 bytes Database Buffers 117440512 bytes Redo Buffers 4366336 bytes Database mounted. SQL> alter database noarchivelog--修改为非归档模式 2 ; Database altered. SQL> alter database open--打开数据库 2 ; ------------------------------------前面是修改数据库为非归档模式------------------ Database altered. SQL> archive log list;--查看是否归档 Database log mode No Archive Mode Automatic archival Disabled Archive destination /u01/app/oracle/archive/archive02/ Oldest online log sequence 362 Current log sequence 365 SQL> clear SQL> !clear SQL> archive log list; Database log mode No Archive Mode Automatic archival Disabled Archive destination /u01/app/oracle/archive/archive02/ Oldest online log sequence 362 Current log sequence 365 SQL> shutdown immediate Database closed. Database dismounted. ORACLE instance shut down. SQL> startup mount ORA-32004: obsolete or deprecated parameter(s) specified for RDBMS instance ORACLE instance started. Total System Global Area 400846848 bytes Fixed Size 2213776 bytes Variable Size 276826224 bytes Database Buffers 117440512 bytes Redo Buffers 4366336 bytes Database mounted. SQL> alter database archivelog;--修改为归档模式 Database altered. SQL> alter database open; Database altered. SQL> archive log list; Database log mode Archive Mode Automatic archival Enabled Archive destination/u01/app/oracle/archive/archive02/--归档区，默认是在闪回区 Oldest online log sequence 362 Next log sequence to archive 365 Current log sequence 365 SQL> show parameter db_rec NAME TYPE VALUE ------------------------------------ ----------- ------------------------------ db_recovery_file_deststring /u01/app/oracle/flash_recovery --闪回区配置 _area db_recovery_file_dest_size big integer 3882M db_recycle_cache_size big integer 0 SQL> show parameter db_flashback_retent NAME TYPE VALUE ------------------------------------ ----------- ------------------------------ db_flashback_retention_target integer 1440--闪回保留时间默认是24小时，也就是1440分钟 SQL> !ls /u01/app/oracle/flash_recovery_area jiagulun JIAGULUN——里面是空的 SQL> shutdown immediate Database closed. Database dismounted. ORACLE instance shut down. SQL> startup mount ORA-32004: obsolete or deprecated parameter(s) specified for RDBMS instance ORACLE instance started. Total System Global Area 400846848 bytes Fixed Size 2213776 bytes Variable Size 276826224 bytes Database Buffers 117440512 bytes Redo Buffers 4366336 bytes Database mounted. SQL> alter database flashback on;--启动数据库闪回 Database altered. SQL> !ls /u01/app/oracle/flash_recovery_area jiagulun JIAGULUN [oracle@localhost flashback]$ pwd /u01/app/oracle/flash_recovery_area/JIAGULUN/flashback [oracle@localhost JIAGULUN]$ cd flashback/ [oracle@localhost flashback]$ ls o1_mf_bd97qnhk_.flb o1_mf_bd987hyb_.flb SQL> alter database open; Database altered. SQL> select to_char(sysdate,'yyyymmdd hh24:mi:ss') from dual; TO_CHAR(SYSDATE,' ----------------- 20150124 23:47:01 SQL> select name from v$tablespace; NAME ------------------------------ SYSTEM SYSAUX UNDOTBS1 USERS TEMP EXAMPLE TESTTS TEMP2 TEMP3 UNDOTBS2 TEST_TRAN_TS 11 rows selected. SQL> create tablespace test_flashback_database datafile '/u01/app/oracle/oradata/jiagulun/test_flashback_database.dbf' size 10m; Tablespace created. SQL> select name from v$tablespace; NAME ------------------------------ SYSTEM SYSAUX UNDOTBS1 USERS TEMP EXAMPLE TESTTS TEMP2 TEMP3 UNDOTBS2 TEST_TRAN_TS NAME ------------------------------ TEST_FLASHBACK_DATABASE 12 rows selected. SQL> SQL> shutdown immediate Database closed. Database dismounted. ORACLE instance shut down. SQL> startup mount ORA-32004: obsolete or deprecated parameter(s) specified for RDBMS instance ORACLE instance started. Total System Global Area 400846848 bytes Fixed Size 2213776 bytes Variable Size 276826224 bytes Database Buffers 117440512 bytes Redo Buffers 4366336 bytes Database mounted. SQL> flashback database to timestamp to_date('20150124 23:47:01','yyyymmdd hh24:mi:ss'); Flashback complete. SQL> startup force ORA-32004: obsolete or deprecated parameter(s) specified for RDBMS instance ORACLE instance started. Total System Global Area 400846848 bytes Fixed Size 2213776 bytes Variable Size 276826224 bytes Database Buffers 117440512 bytes Redo Buffers 4366336 bytes Database mounted. ORA-01589: must use RESETLOGS or NORESETLOGS option for database open SQL> alter database open resetlogs; --为什么会要求open为resetlog？ 因为：数据库被闪回了，那么从闪回前在到闪回点的重做日志对于数据库来说已经是无效的了。所以要求重设日志。 SQL> alter database open read only;--有两种模式：read only、read write；之所以为这种状态，因为数据库在闪回后，就不是现在的数据库了 数据库的状态发生了改变，不希望其他用户登录进来防止出现问题 Database altered. SQL> select name from v$tablespace; NAME ------------------------------ SYSTEM SYSAUX UNDOTBS1 USERS TEMP EXAMPLE TESTTS TEMP2 TEMP3 UNDOTBS2 TEST_TRAN_TS TEST_FLASHBACK_DATABASE --已经不存在了，被闪回了 11 rows selected. SQL> SQL> shutdown immediate Database closed. Database dismounted. ORACLE instance shut down. SQL> startup mount ORA-32004: obsolete or deprecated parameter(s) specified for RDBMS instance ORACLE instance started. Total System Global Area 400846848 bytes Fixed Size 2213776 bytes Variable Size 276826224 bytes Database Buffers 117440512 bytes Redo Buffers 4366336 bytes Database mounted. SQL> alter database archivelog 2 ; Database altered. SQL> SQL> archive log list; Database log mode Archive Mode Automatic archival Enabled Archive destination /u01/app/oracle/archive/archive02/ Oldest online log sequence 1 Next log sequence to archive 1 Current log sequence 1 SQL> alter database noarchivelog;--归档变成非归档 alter database noarchivelog * ERROR at line 1: ORA-38774: cannot disable media recovery - flashback database is enabled --表示在flashback状态不能变成非归档 SQL> alter database flashback off;--关闭flashback Database altered. SQL> alter database noarchivelog;--再进行归档到非归档的切换 Database altered. SQL> archive log list; Database log mode No Archive Mode Automatic archival Disabled Archive destination /u01/app/oracle/archive/archive02/ Oldest online log sequence 1 Current log sequence 1 SQL> alter database open; Database altered. SQL>