Normal 0 7.8 pt 0 2 false false false EN-US ZH-CN X-NONE实验目的：学会重建控制文件

实验结果：数据库名(db_name)由原来的mydb变成yourdb。

实验参考：Chapter 5 of “Administrator’s Guide”

范例：

1. 查看原数据库名

SQL> select name from v$database;

NAME

---------

MYDB

2. 备份当前控制文件

SQL> ALTER DATABASE BACKUP CONTROLFILE TO TRACE;

备份后的文件在目录user_dump_dest下，用以下命令查看：

SQL> show parameter user_dump_dest

在该目录下有很多的trace文件，可以用以下命令确定哪个是刚刚生成的trace文件：

$ ls –lt

-rw-r----- 1 oracle oinstall 75991 Jun 28 16:09 alert_mydb.log

-rw-r----- 1 oracle oinstall 6421 Jun 28 16:09 mydb_ora_31550.trc

……

alert_mydb.log的下一个文件即使刚刚生成的trace文件。

查看该文件内容;

$ more mydb_ora_31550.trc

找到以下这段话：(由于我们要重命名数据库，所以使用RESETLOGS案例)

-- Set #2. RESETLOGS case

--

-- The following commands will create a new control file and use it

-- to open the database.

-- Data used by Recovery Manager will be lost.

-- The contents of online logs will be lost and all backups will

-- be invalidated. Use this only if online logs are damaged.

-- After mounting the created controlfile, the following SQL

-- statement will place the database in the appropriate

-- protection mode:

-- ALTER DATABASE SET STANDBY DATABASE TO MAXIMIZE PERFORMANCE

STARTUP NOMOUNT

CREATE CONTROLFILE REUSE DATABASE "MYDB" RESETLOGS NOARCHIVELOG

MAXLOGFILES 6

MAXLOGMEMBERS 5

MAXDATAFILES 100

MAXINSTANCES 3

MAXLOGHISTORY 292

LOGFILE

GROUP 1 '/oracle/db11g/oradata/mydb/redo01.log' SIZE 100M BLOCKSIZE 512,

GROUP 2 '/oracle/db11g/oradata/mydb/redo02.log' SIZE 100M BLOCKSIZE 512,

GROUP 3 '/oracle/db11g/oradata/mydb/redo03.log' SIZE 100M BLOCKSIZE 512

-- STANDBY LOGFILE

DATAFILE

'/oracle/db11g/oradata/mydb/system01.dbf',

'/oracle/db11g/oradata/mydb/sysaux01.dbf',

'/oracle/db11g/oradata/mydb/undotbs01.dbf',

'/oracle/db11g/oradata/mydb/perm01.dbf',

'/oracle/db11g/oradata/mydb/users01.dbf',

'/oracle/db11g/oradata/mydb/indx01.dbf'

CHARACTER SET US7ASCII

;

-- Commands to re-create incarnation table

-- Below log names MUST be changed to existing filenames on

-- disk. Any one log file from each branch can be used to

-- re-create incarnation records.

-- ALTER DATABASE REGISTER LOGFILE '/oracle/db11g/11.2/dbs/arch1_1_722623275.dbf';

-- Recovery is required if any of the datafiles are restored backups,

-- or if the last shutdown was not normal or immediate.

RECOVER DATABASE USING BACKUP CONTROLFILE

-- Database can now be opened zeroing the online logs.

ALTER DATABASE OPEN RESETLOGS;

-- Commands to add tempfiles to temporary tablespaces.

-- Online tempfiles have complete space information.

-- Other tempfiles may require adjustment.

ALTER TABLESPACE TEMPTS1 ADD TEMPFILE '/oracle/db11g/oradata/mydb/temp01.dbf'

SIZE 20971520 REUSE AUTOEXTEND ON NEXT 8192 MAXSIZE 32767M;;

2. 把原有的控制文件移走

SQL> show parameter control_files

NAME TYPE VALUE

------------------------------------ ----------- ------------------------------

control_files string /oracle/db11g/oradata/mydb/control01.ctl,

/oracle/db11g/oradata/mydb/control02.ctl

$ cd /oracle/db11g/oradata/mydb

$ mv control01.ctl control01.ctl.bkp

$ mv control02.ctl control02.ctl.bkp

3. 修改pfile

db_name=yourdb

4. 重建控制文件

SQL> startup nomount

SQL>CREATE CONTROLFILE

SET DATABASE "YOURDB" RESETLOGS NOARCHIVELOG