Oracle 10G 启用闪回功能

[oracle@localhost ~]$ sqlplus /nolog

SQL*Plus: Release 10.2.0.1.0 - Production on Mon May 15 15:17:17 2006

Copyright (c) 1982, 2005, Oracle.  All rights reserved.

SQL> connect /as sysdba
Connected.

SQL> show parameter db_recovery_file_dest;

NAME                                 TYPE        VALUE
------------------------------------ ----------- ------------------------------
db_recovery_file_dest                string
db_recovery_file_dest_size           big integer 0

SQL>
SQL> show parameter db_flashback_retention_target

NAME                                 TYPE        VALUE
------------------------------------ ----------- ------------------------------
db_flashback_retention_target        integer     1440

 

SQL> show parameter db_recovery_file_dest

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=10000000;

System altered.

SQL> alter system set db_recovery_file_dest='/opt/oracle/product/flash_recovery_area';

System altered.

SQL> show parameter db_flashback_retention_target

NAME                                 TYPE        VALUE
------------------------------------ ----------- ------------------------------
db_flashback_retention_target        integer     1440

SQL> shutdown immediate
Database closed.
Database dismounted.
ORACLE instance shut down.

SQL> startup mount
ORACLE instance started.

Total System Global Area  130023424 bytes
Fixed Size                  1218052 bytes
Variable Size             117443068 bytes
Database Buffers            8388608 bytes
Redo Buffers                2973696 bytes
Database mounted.

SQL> alter database flashback on;

Database altered.

SQL> alter database open;

Database altered.

SQL> select flashback_on from v$database;

FLASHBACK_ON
------------------
YES

SQL>

 

 

OK!============

 

 

后来发现问题：

 

  ORA-01552: 非系统表空间'USERS'无法使用系统回退段

解决办法：

  PLSQL中：

   select segment_name,status from dba_rollback_segs;

segment_name,status

--------------------------------

1 SYSTEM ONLINE
12 RBS_SMALL OFFLINE

 

alter rollback segment "RBS_SMALL" online;

 

问题解决：

参考： 

发表于: 2005-11-23 17:05    主题：

---

这个是因为当前只有system这个回滚段可用，
可以查看当前系统回滚段信息：
select segment_name,status from dba_rollback_segs;
如：

SEGMENT_NAME                   STATUS
------------------------------ ----------------
SYSTEM                         ONLINE
RBS0                           OFFLINE
如果有offline的，使用alter rollback segment "RBS0" online;
如果只有system这一行，那就最好创建新的回滚段了：
create rollback segment rbs_small storage(initial 64k next 64k minextents 2 maxextents 4) tablespace tools;
各个参数的含义你可以到google上搜到。