回滚段删除重建

①、修改启动参数
    undo_management=manual

②、进入SQLPLUS
SQL> connect / as sysdba
Connected to an idle instance.
SQL> shutdown immediate;

SQL> startup pfile=E:\demo\FTCRM_DB\pfile\initFTCRM.ora mount;

SQL> alter database open;

③、查看undo_management参数
SQL> show parameter undo_

NAME                                 TYPE        VALUE
------------------------------------ ----------- ------------------------------
undo_management                      string      MANUAL
undo_retention                       integer     10800
undo_suppress_errors                 boolean     FALSE
undo_tablespace                      string      RBSG_SPC

④、关闭数据库
SQL> shutdown immediate;
D

⑤、到Dos下删除回滚段
SQL> host

C:\Documents and Settings\Qianhb>del E:\demo\FTCRM_DB\DbFile\RBSGFTCRM.ODB

C:\Documents and Settings\Qianhb>exit

⑥、重新启动到mount状态
SQL> startup pfile=E:\demo\FTCRM_DB\pfile\initFTCRM.ora mount;
⑦、打开数据库，报回滚段文件错误
SQL> alter database open;
alter database open
*
ERROR at line 1:
ORA-01157: cannot identify/lock data file 2 - see DBWR trace file
ORA-01110: data file 2: 'E:\DEMO\FTCRM_DB\DBFILE\RBSGFTCRM.ODB'

⑧、删除回滚段文件
SQL> alter database datafile 'E:\DEMO\FTCRM_DB\DBFILE\RBSGFTCRM.ODB' offline drop;

Database altered.

SQL> alter database open;

Database altered.

⑨、重新建立新的回滚段RBSG_SP1
SQL> CREATE UNDO TABLESPACE RBSG_SP1
  2  DATAFILE  'e:\demo\FTCRM_DB\DbFile\rbsgFTCRM1.ODB' SIZE 200M
  3  REUSE AUTOEXTEND ON NEXT  5120K MAXSIZE UNLIMITED;

Tablespace created.

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

⑩、关闭数据库，将启动参数undo_management设置为自动管理(如果不改的话,数据库无法使用回滚段空间,只要修改就会报错)；undo_tablespace设置为新的回滚段，并启动数据库
SQL> startup pfile=E:\demo\FTCRM_DB\pfile\initFTCRM.ora mount;
SQL> show parameter undo_

NAME                                 TYPE        VALUE
------------------------------------ ----------- ------------------------------
undo_management                      string      AUTO
undo_retention                       integer     10800
undo_suppress_errors                 boolean     FALSE
undo_tablespace                      string      RBSG_SP1

SQL> alter database open;

Database altered.

⑾、删除老的回滚段【完成】
SQL> drop tablespace rbsg_spc;

Tablespace dropped.