恢复控制文件后如何避免resetlogs打开数据库？

恢复控制文件后，数据库使用resetlogs方式打开，在线日志的序列被重置。SYS@practice >select group#,sequence#,archived,status,first_change#,next_change# from v$log; GROUP# SEQUENCE# ARC STATUS FIRST_CHANGE# NEXT_CHANGE#
---------- ---------- --- ---------------- ------------- ------------
1 1 NO CURRENT 1014415 2.8147E+14
2 0 YES UNUSED 0 0
3 0 YES UNUSED 0 0如果没有被resetlog截断的话当前日志的序列号应该是7，8，9
SYS@practice >select recid,sequence#,first_change#,next_change# from v$log_history; RECID SEQUENCE# FIRST_CHANGE# NEXT_CHANGE#
---------- ---------- ------------- ------------
1 1 925702 955284
2 2 955284 955847
3 3 955847 971151
4 4 971151 987800
5 5 987800 997957
6 6 997957 1010981
7 1 1010981 1013463
8 2 1013463 1013471
9 3 1013471 1014415如果恢复完控制文件，不使用resetlogs是打不开数据库的。我们可以采取手工创建控制文件的方法打开数据库，保持联机日志的sequence#连续。下面的实验来演示具体操作过程。在实验之前先手工切换3次日志，使得在线日志的序列号产生变化。在恢复结束后作为参考。
SYS@practice >alter system archive log current;SYS@practice >alter system archive log current;SYS@practice >alter system archive log current;切换后当前连接日志状态如下
SYS@practice >select group#,sequence#,archived,status,first_change#,next_change# from v$log; GROUP# SEQUENCE# ARC STATUS FIRST_CHANGE# NEXT_CHANGE#
---------- ---------- --- ---------------- ------------- ------------
1 4 NO CURRENT 1030130 2.8147E+14
2 2 YES INACTIVE 1030109 1030117
3 3 YES ACTIVE 1030117 10301301，恢复控制文件
RMAN> startup force nomount;Oracle instance startedTotal System Global Area 580395008 bytesFixed Size 2255392 bytes
Variable Size 402654688 bytes
Database Buffers 171966464 bytes
Redo Buffers 3518464 bytesRMAN> restore controlfile from autobackup;Starting restore at 06-OCT-14
using target database control file instead of recovery catalog
allocated channel: ORA_DISK_1
channel ORA_DISK_1: SID=19 device type=DISKrecovery area destination: /u01/fast_recovery_area
database name （or database unique name） used for search: PRACTICE
channel ORA_DISK_1: AUTOBACKUP /u01/fast_recovery_area/PRACTICE/autobackup/2014_10_06/o1_mf_s_860251717_b35s05gm_.bkp found in the recovery area
channel ORA_DISK_1: looking for AUTOBACKUP on day: 20141006
channel ORA_DISK_1: restoring control file from AUTOBACKUP /u01/fast_recovery_area/PRACTICE/autobackup/2014_10_06/o1_mf_s_860251717_b35s05gm_.bkp
channel ORA_DISK_1: control file restore from AUTOBACKUP complete
output file name=/u01/oradata/practice/control01.ctl
output file name=/u01/fast_recovery_area/practice/control02.ctl
Finished restore at 06-OCT-142，启动数据库到mount状态
RMAN> mount database;database mounted
released channel: ORA_DISK_13，恢复数据库
RMAN> recover database;Starting recover at 06-OCT-14
Starting implicit crosscheck backup at 06-OCT-14
allocated channel: ORA_DISK_1
channel ORA_DISK_1: SID=20 device type=DISK
Crosschecked 6 objects
Finished implicit crosscheck backup at 06-OCT-14Starting implicit crosscheck copy at 06-OCT-14
using channel ORA_DISK_1
Finished implicit crosscheck copy at 06-OCT-14searching for all files in the recovery area
cataloging files...
cataloging doneList of Cataloged Files
=======================
File Name: /u01/fast_recovery_area/PRACTICE/archivelog/2014_10_06/o1_mf_1_1_b362kndr_.arc
File Name: /u01/fast_recovery_area/PRACTICE/archivelog/2014_10_06/o1_mf_1_3_b362lc83_.arc
File Name: /u01/fast_recovery_area/PRACTICE/archivelog/2014_10_06/o1_mf_1_2_b362l34q_.arc
File Name: /u01/fast_recovery_area/PRACTICE/autobackup/2014_10_06/o1_mf_s_860251717_b35s05gm_.bkp
File Name: /u01/fast_recovery_area/PRACTICE/autobackup/2014_10_06/o1_mf_s_860251162_b35rgt84_.bkp
File Name: /u01/fast_recovery_area/PRACTICE/autobackup/2014_10_06/o1_mf_s_860251158_b35rgpms_.bkp
File Name: /u01/fast_recovery_area/PRACTICE/autobackup/2014_10_06/o1_mf_s_860246909_b35n9x55_.bkpusing channel ORA_DISK_1starting media recoveryarchived log for thread 1 with sequence 1 is already on disk as file /u01/fast_recovery_area/PRACTICE/archivelog/2014_10_06/o1_mf_1_1_b362kndr_.arc
archived log for thread 1 with sequence 2 is already on disk as file /u01/fast_recovery_area/PRACTICE/archivelog/2014_10_06/o1_mf_1_2_b362l34q_.arc
archived log for thread 1 with sequence 3 is already on disk as file /u01/fast_recovery_area/PRACTICE/archivelog/2014_10_06/o1_mf_1_3_b362lc83_.arc
archived log for thread 1 with sequence 4 is already on disk as file /u01/oradata/practice/redo01.log
archived log file name=/u01/fast_recovery_area/PRACTICE/archivelog/2014_10_06/o1_mf_1_1_b362kndr_.arc thread=1 sequence=1
archived log file name=/u01/fast_recovery_area/PRACTICE/archivelog/2014_10_06/o1_mf_1_2_b362l34q_.arc thread=1 sequence=2
archived log file name=/u01/fast_recovery_area/PRACTICE/archivelog/2014_10_06/o1_mf_1_3_b362lc83_.arc thread=1 sequence=3
archived log file name=/u01/oradata/practice/redo01.log thread=1 sequence=4
media recovery complete, elapsed time: 00:00:00
Finished recover at 06-OCT-144，备份控制文件到trace
SYS@practice >select open_mode from v$database;OPEN_MODE
--------------------
MOUNTEDSYS@practice >alter database backup controlfile to trace;
SYS@practice >select value from v$diag_info where name="Default Trace File";VALUE
--------------------------------------------------------------------------------
/u01/diag/rdbms/practice/practice/trace/practice_ora_1185.trc5，重启实例到nomount状态
RMAN> startup force nomount;Oracle instance startedTotal System Global Area 580395008 bytesFixed Size 2255392 bytes
Variable Size 402654688 bytes
Database Buffers 171966464 bytes
Redo Buffers 3518464 bytes6，执行重建控制文件命令进入到mount状态
vi /home/oracle/create_controlfile.sqlSTARTUP NOMOUNT
CREATE CONTROLFILE REUSE DATABASE "PRACTICE" NORESETLOGS ARCHIVELOG
MAXLOGFILES 16
MAXLOGMEMBERS 3
MAXDATAFILES 100
MAXINSTANCES 8
MAXLOGHISTORY 292
LOGFILE
GROUP 1 "/u01/oradata/practice/redo01.log" SIZE 50M BLOCKSIZE 512,
GROUP 2 "/u01/oradata/practice/redo02.log" SIZE 50M BLOCKSIZE 512,
GROUP 3 "/u01/oradata/practice/redo03.log" SIZE 50M BLOCKSIZE 512
DATAFILE
"/u01/oradata/practice/system01.dbf",
"/u01/oradata/practice/sysaux01.dbf",
"/u01/oradata/practice/undotbs01.dbf",
"/u01/oradata/practice/users01.dbf",
"/u01/oradata/practice/example01.dbf"
CHARACTER SET AL32UTF8
;
VARIABLE RECNO NUMBER;
EXECUTE :RECNO := SYS.DBMS_BACKUP_RESTORE.SETCONFIG（"CONTROLFILE AUTOBACKUP","ON"）;
RECOVER DATABASE
ALTER SYSTEM ARCHIVE LOG ALL;
ALTER DATABASE OPEN;
ALTER TABLESPACE TEMP ADD TEMPFILE "/u01/oradata/practice/temp01.dbf" REUSE;在sqlplus下执行创建控制文件脚本，数据库会启动到open状态并添加临时表空间文件。SYS@practice >@create_controlfile.sqlControl file created.PL/SQL procedure successfully completed.Media recovery complete.System altered.Database altered.Tablespace altered.此时数据库已经处于read write状态也就是open状态了
SYS@practice >select open_mode from v$database;OPEN_MODE
--------------------
READ WRITE查看当前日志的序列号，没有被重置。
SYS@practice >select group#,sequence#,archived,status,first_change#,next_change# from v$log; GROUP# SEQUENCE# ARC STATUS FIRST_CHANGE# NEXT_CHANGE#
---------- ---------- --- ---------------- ------------- ------------
1 4 YES INACTIVE 1030130 1050296
2 5 NO CURRENT 1050296 2.8147E+14
3 3 YES INACTIVE 1030117 1030130查看临时表数据文件也被创建出来了。
SYS@practice >select name from v$tempfile;NAME
--------------------------------------------------------------------------------
/u01/oradata/practice/temp01.dbf
7，重新识别控制文件的备份信息和配置信息此时的控制文件中没有之前备份过控制文件的信息
RMAN> list backup of controlfile;using target database control file instead of recovery catalog
specification does not match any backup in the repository从闪回恢复区重新注册备份信息
RMAN> catalog db_recovery_file_dest;从执行过数据库全备份的地址注册备份信息
RMAN> catalog start with "/home/oracle/";再次列出备份过的控制文件，可以看到已经全部注册成功
RMAN> list backup of controlfile;List of Backup Sets
===================BS Key Type LV Size Device Type Elapsed Time Completion Time
------- ---- -- ---------- ----------- ------------ ---------------
1 Full 9.67M DISK 00:00:00 06-OCT-14
BP Key: 1 Status: AVAILABLE Compressed: NO Tag: TAG20141006T175610
Piece Name: /u01/fast_recovery_area/PRACTICE/autobackup/2014_10_06/o1_mf_s_860262970_b363zt2x_.bkp
Control File Included: Ckp SCN: 1051644 Ckp time: 06-OCT-14BS Key Type LV Size Device Type Elapsed Time Completion Time
------- ---- -- ---------- ----------- ------------ ---------------
3 Full 9.33M DISK 00:00:00 06-OCT-14
BP Key: 3 Status: AVAILABLE Compressed: NO Tag: TAG20141006T132827
Piece Name: /u01/fast_recovery_area/PRACTICE/backupset/2014_10_06/o1_mf_ncnnf_TAG20141006T132827_b35n9w39_.bkp
Control File Included: Ckp SCN: 1005439 Ckp time: 06-OCT-14BS Key Type LV Size Device Type Elapsed Time Completion Time
------- ---- -- ---------- ----------- ------------ ---------------
7 Full 9.33M DISK 00:00:00 06-OCT-14
BP Key: 7 Status: AVAILABLE Compressed: NO Tag: TAG20141006T143909
Piece Name: /home/oracle/full_PRACTICE_9_20141006_1.bak
Control File Included: Ckp SCN: 1013438 Ckp time: 06-OCT-14本次实验到此结束。更多Oracle相关信息见Oracle 专题页面 http://www.linuxidc.com/topicnews.aspx？tid=12本文永久更新链接地址