我们知道通过设置nologging选项,可以加快oracle的某些操作的执行速度,这在执行某些维护任务时是非常有用的,但是该选项也很危险
我们知道通过设置nologging选项,可以加快Oracle的某些操作的执行速度,这在执行某些维护任务时是非常有用的,但是该选项也很危险,如果使用不当,就可能导致数据库发生ORA-26040错误。
首先,构造使用环境,
SQL> select tablespace_name,logging,force_logging from dba_tablespaces;
TABLESPACE_NAME LOGGING FOR
------------------------------ --------- ---
SYSTEM LOGGING NO
UNDOTBS1 LOGGING NO
SYSAUX LOGGING NO
TEMP NOLOGGING NO
USERS LOGGING NO
LOGGING LOGGING NO
6 rows selected.
SQL> show user
USER is "LOGGING"
SQL> select table_name,logging from user_tables;
TABLE_NAME LOG
------------------------------ ---
SOURCE YES
NOLOG NO
NOLOG1 NO
我们使用create table table_name nologging as select * from user_tables创建了表nolog和nolog1。在创建表之前,先使用rman进行全库的备份,表创建完成后,关闭数据库,并使用备份来恢复,结果如下:
[oraten@yue bdump]$ rman target /
Recovery Manager: Release 10.2.0.5.0 - Production on 星期四 11月 13 17:21:02 2014
Copyright (c) 1982, 2007, Oracle. All rights reserved.
connected to target database: ORATEN (DBID=3658365464, not open)
RMAN> list backup;
using target database control file instead of recovery catalog
List of Backup Sets
===================
BS Key Type LV Size Device Type Elapsed Time Completion Time
------- ---- -- ---------- ----------- ------------ -------------------
97 Full 565.31M DISK 00:00:41 2014-11-12 09:34:45
BP Key: 65 Status: AVAILABLE Compressed: NO Tag: TAG20141112T093404
Piece Name: /home/app/oraten/flash_recovery_area/ORATEN/backupset/2014_11_12/o1_mf_nnndf_TAG20141112T093404_b65g8fc3_.bkp
List of Datafiles in backup set 97
File LV Type Ckp SCN Ckp Time Name
---- -- ---- ---------- ------------------- ----
1 Full 1276159 2014-11-12 09:34:04 /home/app/oraten/oradata/oraten/system01.dbf
2 Full 1276159 2014-11-12 09:34:04 /home/app/oraten/oradata/oraten/undotbs01.dbf
3 Full 1276159 2014-11-12 09:34:04 /home/app/oraten/oradata/oraten/sysaux01.dbf
4 Full 1276159 2014-11-12 09:34:04 /home/app/oraten/oradata/oraten/users01.dbf
5 Full 1276159 2014-11-12 09:34:04 /home/app/oraten/oradata/oraten/logging01.dbf
BS Key Type LV Size Device Type Elapsed Time Completion Time
------- ---- -- ---------- ----------- ------------ -------------------
98 Full 6.86M DISK 00:00:02 2014-11-12 09:34:52
BP Key: 66 Status: AVAILABLE Compressed: NO Tag: TAG20141112T093404
Piece Name: /home/app/oraten/flash_recovery_area/ORATEN/backupset/2014_11_12/o1_mf_ncsnf_TAG20141112T093404_b65g9vx2_.bkp
Control File Included: Ckp SCN: 1276545 Ckp time: 2014-11-12 09:34:50
SPFILE Included: Modification time: 2014-11-12 09:14:00
RMAN> restore database;
Starting restore at 2014-11-13 17:21:19
allocated channel: ORA_DISK_1
channel ORA_DISK_1: sid=155 devtype=DISK
通道 ORA_DISK_1:开始数据文件备份集恢复
通道 ORA_DISK_1:指定要从备份集恢复的数据文件
将数据文件 00001 恢复到 /home/app/oraten/oradata/oraten/system01.dbf
将数据文件 00002 恢复到 /home/app/oraten/oradata/oraten/undotbs01.dbf
将数据文件 00003 恢复到 /home/app/oraten/oradata/oraten/sysaux01.dbf
将数据文件 00004 恢复到 /home/app /oraten/oradata/oraten/users01.dbf
将数据文件 00005 恢复到 /home/app/oraten/oradata/oraten/logging01.dbf
通道 ORA_DISK_1:从备份片 /home/app/oraten/flash_recovery_area/ 读取ORATEN/backupset/2014_11_12/o1_mf_nnndf_TAG20141112T093404_b65g8fc3_.bkp
通道 ORA_DISK_1:恢复备份片 1
片句柄=/home/app/oraten/flash_recovery_area/ORATEN/backupset/2014_11_1 2/o1_mf_nnndf_TAG20141112T093404_b65g8fc3_.bkp 标签=TAG20141112T093404
频道ORA_DISK_1: 恢复完成,已用时间: 00:00:25
于2014-11-13 17:21:45完成恢复
RMAN>恢复数据库;
于 2014-11-13 17:21:50 开始恢复
使用通道 ORA_DISK_1
开始媒体恢复