Oracle重建控制檔案 - Rebuild controlfile
重建控制檔案時DBA需要知道,但是也許整個職業生涯都不會再生產系統上遇見。
首先強調,備份是最安全,快捷,有效恢複方式,一個DBA,如果沒有規劃好有效備份,終有一天,他會被噩夢驚醒。
夢醒之後,就是無奈的,繁雜的手工恢複。而且,恢複到什麼程度,就要看天,看命,反正不能看自己了,因為沒有備份,你已經將主動權完全交個別人。這裡就記錄一下controlfile的重建
在其他正常的資料庫上建立controlfile trace
SQL> alter database backup controlfile to trace;
指定trace檔案的產生路徑
SQL> alter database backup controlfile to trace as '/tmp/controlfile.trc'; trace 檔案路徑在user_dump_dest下
SQL> show parameter user_dump_dest
NAME TYPE VALUE
-------------- ------ ------------------------------------------------
user_dump_dest string /home/Oracle/admin/R10105/udump/
After navigating to the directory locate the latest trace file by date/time by issuing: ls -ltr.
% cd /home/oracle/admin/R10105/udump/
% ls -ltr
一個完整的trace請參考附件
你可以修改trace檔案的路徑等具體參數值,並提取其中的建立指令碼
STARTUP NOMOUNT
CREATE CONTROLFILE REUSE DATABASE "R10105" NORESETLOGS ARCHIVELOG
MAXLOGFILES 16
MAXLOGMEMBERS 3
MAXDATAFILES 100
MAXINSTANCES 8
MAXLOGHISTORY 454
LOGFILE
GROUP 1 '/opt/oracle/oradata/R10105/redo01.log' SIZE 10M,
GROUP 2 '/opt/oracle/oradata/R10105/redo02.log' SIZE 10M,
GROUP 3 '/opt/oracle/oradata/R10105/redo03.log' SIZE 10M
-- STANDBY LOGFILE
DATAFILE
'/opt/oracle/oradata/R10105/system01.dbf',
'/opt/oracle/oradata/R10105/undotbs01.dbf',
'/opt/oracle/oradata/R10105/sysaux01.dbf',
'/opt/oracle/oradata/R10105/users01.dbf',
'/opt/oracle/oradata/R10105/example01.dbf'
CHARACTER SET AL32UTF8
;
註冊archivelog
-- ALTER DATABASE REGISTER LOGFILE '/home/oracle/flash_recovery_area/R10105/archivelog/2012_06_15/o1_mf_1_1_%u_.arc';
-- ALTER DATABASE REGISTER LOGFILE '/home/oracle/flash_recovery_area/R10105/archivelog/2012_06_15/o1_mf_1_1_%u_.arc';
-- Recovery is required if any of the datafiles are restored backups,
-- or if the last shutdown was not normal or immediate.
RECOVER DATABASE
-- All logs need archiving and a log switch is needed.
ALTER SYSTEM ARCHIVE LOG ALL;
-- Database can now be opened normally.
ALTER DATABASE OPEN;
-- Commands to add tempfiles to temporary tablespaces.
-- Online tempfiles have complete space information.
-- Other tempfiles may require adjustment.
ALTER TABLESPACE TEMP ADD TEMPFILE '/opt/oracle/oradata/R10105/temp01.dbf'
SIZE 20971520 REUSE AUTOEXTEND ON NEXT 655360 MAXSIZE 32767M;
-- End of tempfile additions.
--
其實重建控制檔案,就是相當於手動重建立庫,把現有的資料庫資源,逐一添加到controlfile中,最後註冊目前的archivelog檔案。
同時,重建controlfile分為NORESETLOGS和RESETLOGS兩種,根據需求選擇相應的指令碼。
最後的最後,這一切,都是噩夢,還是做好有效備份,有備無患,才是王道!!
附件:
Oracle重建控制檔案 - Rebuild controlfile
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