[每日一题] 11gOCP 1z0-052 :2013-09-8 用户管理下的热备报错:ORA-01123.................................A45

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正确答案:B

做热备的前提条件是一定要开归档,可以用以下几种方式查一下有没有开归档:

方法一:

sys@OCM> archive log list;
Database log mode             No Archive Mode
Automatic archival               Disabled
Archive destination            /arch
Oldest online log sequence     2
Next log sequence to archive   4
Current log sequence           4

方法二:查视图

sys@OCM> select log_mode from v$database;

LOG_MODE
------------
NOARCHIVELOG

方法三:转出CONTROLFILE的创建脚本:

sys@OCM> alter database backup controlfile to trace as '/tmp/control.txt';

Database altered.
CREATE CONTROLFILE REUSE DATABASE "OCM" NORESETLOGS  NOARCHIVELOG
    MAXLOGFILES 16
    MAXLOGMEMBERS 3
    MAXDATAFILES 100
    MAXINSTANCES 8
    MAXLOGHISTORY 292
LOGFILE
  GROUP 1 '/u01/app/oracle/oradata/ocm/redo01.log'  SIZE 50M BLOCKSIZE 512,
  GROUP 2 '/u01/app/oracle/oradata/ocm/redo02.log'  SIZE 50M BLOCKSIZE 512,
  GROUP 3 '/u01/app/oracle/oradata/ocm/redo03.log'  SIZE 50M BLOCKSIZE 512
-- STANDBY LOGFILE
DATAFILE
  '/u01/app/oracle/oradata/ocm/system01.dbf',
  '/u01/app/oracle/oradata/ocm/sysaux01.dbf',
  '/u01/app/oracle/oradata/ocm/undotbs01.dbf',
  '/u01/app/oracle/oradata/ocm/users01.dbf',
  '/u01/app/oracle/oradata/ocm/example01.dbf',
  '/u01/app/oracle/oradata/ocm/gyj01.dbf',
  '/u01/app/oracle/oradata/ocm/gyj02.dbf',
  '/u01/app/oracle/oradata/ocm/tp01.dbf'
CHARACTER SET ZHS16GBK
;

提供用户管理热备的脚本:

sys@OCM>  SELECT 'alter tablespace '||tablespace_name||' begin backup;'||chr(10)||
  2   '!cp '||file_name||' /backup/hot'||chr(10)||
  3    'alter tablespace '||tablespace_name||' end backup;' 
  4   FROM dba_data_files;

'ALTERTABLESPACE'||TABLESPACE_NAME||'BEGINBACKUP;'||CHR(10)||'!CP'||FILE_NAME||'/BACKUP/HOT'||CHR(10)||'ALTERTABLESPACE'||TABLESPACE_NAME||'ENDBACKUP;'
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
alter tablespace TP1 begin backup;
!cp /u01/app/oracle/oradata/ocm/tp01.dbf /backup/hot
alter tablespace TP1 end backup;

alter tablespace GYJ begin backup;
!cp /u01/app/oracle/oradata/ocm/gyj02.dbf /backup/hot
alter tablespace GYJ end backup;

alter tablespace GYJ begin backup;
!cp /u01/app/oracle/oradata/ocm/gyj01.dbf /backup/hot
alter tablespace GYJ end backup;

alter tablespace EXAMPLE begin backup;
!cp /u01/app/oracle/oradata/ocm/example01.dbf /backup/hot
alter tablespace EXAMPLE end backup;

alter tablespace USERS begin backup;
!cp /u01/app/oracle/oradata/ocm/users01.dbf /backup/hot
alter tablespace USERS end backup;

alter tablespace UNDOTBS1 begin backup;
!cp /u01/app/oracle/oradata/ocm/undotbs01.dbf /backup/hot
alter tablespace UNDOTBS1 end backup;

alter tablespace SYSAUX begin backup;
!cp /u01/app/oracle/oradata/ocm/sysaux01.dbf /backup/hot
alter tablespace SYSAUX end backup;

alter tablespace SYSTEM begin backup;
!cp /u01/app/oracle/oradata/ocm/system01.dbf /backup/hot
alter tablespace SYSTEM end backup;

对于用户管理下热备的底层原理在以后的题目中到再来解析。。。

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