1) 備份users
表空間
[oracle@ocmu ~]$ rman target /
recovery manager: release 11.2.0.1.0 - production on sat mar 16 10:41:05 2013
connected to target database: ora11gr2 (dbid=116453860)
rman> backup as backupset tablespace users;
starting backup at 16-mar-13
using target database control file instead of recovery catalog
allocated channel: ora_disk_1
channel ora_disk_1: sid=41 device type=disk
channel ora_disk_1: starting full datafile backup set
channel ora_disk_1: specifying datafile(s) in backup set
channel ora_disk_1: starting piece 1 at 16-mar-13
channel ora_disk_1: finished piece 1 at 16-mar-13
channel ora_disk_1: backup set complete, elapsed time: 00:00:05
finished backup at 16-mar-13
starting control file and spfile autobackup at 16-mar-13
finished control file and spfile autobackup at 16-mar-13
rman>
2) 採用nologging
屬性建立表，並且以直接路徑載入的方式插入資料
scott@ora11gr2>create table t_objects nologging tablespace users as select * from all_objects where 1=2;
table created.
55641 rows created.
scott@ora11gr2>commit;
commit complete.
scott@ora11gr2>
3) rman中列出包含不可恢復資料的資料檔案
rman> report unrecoverable database;
report of files that need backup due to unrecoverable operations
file type of backup required name
rman>
4) 刪除users
表空間，測試
nologging
的不可恢復性
sys@ora11gr2>select file_name from dba_data_files where tablespace_name='users';
file_name
sys@ora11gr2>
5) rman執行恢復
users
表空間操作
rman> shutdown immediate;
database closed
database dismounted
oracle instance shut down
rman> startup mount;
connected to target database (not started)
oracle instance started
database mounted
total system global area 841162752 bytes
fixed size 1339768 bytes
variable size 578817672 bytes
database buffers 255852544 bytes
redo buffers 5152768 bytes
rman> restore tablespace users;
starting restore at 16-mar-13
allocated channel: ora_disk_1
channel ora_disk_1: sid=18 device type=disk
channel ora_disk_1: starting datafile backup set restore
channel ora_disk_1: specifying datafile(s) to restore from backup set
channel ora_disk_1: restored backup piece 1
channel ora_disk_1: restore complete, elapsed time: 00:00:08
finished restore at 16-mar-13
rman> recover tablespace users;
starting recover at 16-mar-13
using channel ora_disk_1
starting media recovery
media recovery complete, elapsed time: 00:00:01
finished recover at 16-mar-13
rman> alter database open;
database opened
rman>
6) 驗證nologging
的不可恢復性
scott@ora11gr2>select count(*) from t_objects;
select count(*) from t_objects
error at line 1:
ora-01578: oracle data block corrupted (file # 4, block # 675)
ora-26040: data block was loaded using the nologging option
scott@ora11gr2>
7) 小結
nolongging能讓你「一時之快」，但是風險是極大的，所以要盡快備份或在空閒時間重建表。
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