前言
oracle/224228.html">oracle/247004.html">控制文件(control file)是一個相當小的文件(最多能增長到64M左右),其中包含Oracle需要的其他文件的一個目錄。參數文件告知實例控制文件的位置,控制文件則告知示例數據庫和在線重做日志文件的位置。控制文件還告知了Oracle其他一些事情,如已發生檢查點的有關信息、數據庫名(必須和db_name參數匹配)、創建數據庫的時間戳、歸檔重做日志的歷史(有時這會讓控制文件變大)、RMAN信息等。
環境:OEL 5.7 + Oracle 10.2.0.5
背景:在Oracle的運維過程中,時常會遇到一些場景是需要重建控制文件才可以解決的。本文的場景可以通過復制控制文件到新路徑,運行一段時間后,再用老的控制文件啟動數據庫重現。
1.當前故障現象
在使用舊的控制文件啟動數據庫時,報錯ORA-01122、ORA-01110、ORA-01207:
SQL> shutdown abortORACLE instance shut down.SQL> startupORACLE instance started.Total System Global Area 599785472 bytesFixed Size 2098112 bytesVariable Size 218106944 bytesDatabase Buffers 373293056 bytesRedo Buffers 6287360 bytesDatabase mounted.ORA-01122: database file 1 failed verification checkORA-01110: data file 1: '/oradata/cxywdb/system01.dbf'ORA-01207: file is more recent than control file - old control file
2.分析故障原因
根據報錯信息查找MOS文檔:
ORA-1122, ORA-1110, ORA-1207 while open the database after crash (文檔 ID 283927.1)
延伸思考一下,為什么會這樣?
主要錯誤是ORA-01207,利用oerr工具看到Oralce對這個錯誤的詳細描述是:
01207, 00000, "file is more recent than control file - old control file"
// *Cause: The control file change sequence number in the data file is
// greater than the number in the control file. This implies that
// the wrong control file is being used. Note that repeatedly causing
// this error can make it stop happening without correcting the real
// problem. Every attempt to open the database will advance the
// control file change sequence number until it is great enough.
// *Action: Use the current control file or do backup control file recovery to
// make the control file current. Be sure to follow all restrictions
// on doing a backup control file recovery.
一般遇到這種情況,當前的控制文件肯定是找不到了。那么就得考慮重建控制文件來解決,MOS給出的建議也是重建控制文件。
3.重建控制文件
重建控制文件的核心步驟:
3.1 備份控制文件到trace
startup mountalter database backup controlfile to trace;oradebug setmypidoradebug tracefile_name
3.2 啟動數據庫到nomount狀態
shutdown abortstartup nomount;
3.3 確認重建控制文件的語句
vi control.sqlCREATE CONTROLFILE REUSE DATABASE "CXYWDB" NORESETLOGS FORCE LOGGING ARCHIVELOG MAXLOGFILES 16 MAXLOGMEMBERS 3 MAXDATAFILES 100 MAXINSTANCES 8 MAXLOGHISTORY 292LOGFILE GROUP 5 '/oradata2/cxywdb/redo11.log' SIZE 50M, GROUP 6 '/oradata2/cxywdb/redo12.log' SIZE 50M, GROUP 7 '/oradata2/cxywdb/redo13.log' SIZE 50M-- STANDBY LOGFILEDATAFILE '/oradata/cxywdb/system01.dbf', '/oradata/cxywdb/undotbs01.dbf', '/oradata/cxywdb/sysaux01.dbf', '/oradata/cxywdb/users01.dbf', '/oradata/cxywdb/alfred01.dbf', '/oradata/cxywdb/alfred02.dbf', '/oradata/cxywdb/alfred03.dbf', '/oradata/cxywdb/alfred04.dbf', '/oradata/cxywdb/alfred05.dbf', '/oradata/cxywdb/dbs_i_alfred01.dbf'CHARACTER SET ZHS16GBK;
3.4 恢復并打開數據庫
SQL> recover database;Media recovery complete.SQL> alter database open;Database altered.
附:實際解決過程如下:
SQL> shutdown abort ORACLE instance shut down.SQL> startup mountORACLE instance started.Total System Global Area 599785472 bytesFixed Size 2098112 bytesVariable Size 218106944 bytesDatabase Buffers 373293056 bytesRedo Buffers 6287360 bytesDatabase mounted.SQL> alter database backup controlfile to trace;Database altered.SQL> oradebug setmypidStatement processed.SQL> oradebug tracefile_name/s01/oracle/admin/cxywdb/udump/cxywdb_ora_3983.trcSQL> shutdown abortORACLE instance shut down.SQL> startup nomount;ORACLE instance started.Total System Global Area 599785472 bytesFixed Size 2098112 bytesVariable Size 218106944 bytesDatabase Buffers 373293056 bytesRedo Buffers 6287360 bytesSQL> @controlControl file created.SQL> select status from v$instance;STATUS------------MOUNTEDSQL> recover database;Media recovery complete.SQL> alter database open;Database altered.
總結
以上就是這篇文章的全部內容了,希望本文的內容對大家的學習或者工作具有一定的參考學習價值,如果有疑問大家可以留言交流,謝謝大家對VeVb武林網的支持。
|
新聞熱點
疑難解答