When you back up a database, the backup control file is also generated. The backup control file contains information about the backup, including the date and time of the backup, the name of the database being backed up, and the name of the backup file.
If you need to troubleshoot a backup, you can use the ALTER DATABASE BACKUP CONTROLFILE TO TRACE command to generate a trace file that contains more detailed information about the backup. The trace file will include the SQL statements that were executed to generate the backup.
This command is useful for troubleshooting problems such as errors that occur during the backup, or backups that are taking a long time to complete.
The following example shows how to use the ALTER DATABASE BACKUP CONTROLFILE TO TRACE command:
ALTER DATABASE BACKUP CONTROLFILE TO TRACE
This command will generate a trace file called DB_BACKUP_TRACE.TRC in the current directory.
Contents
- 1 How do I backup my Controlfile to trace?
- 2 How do I restore a Controlfile to a different location?
- 3 What is meaning of recover database using backup controlfile until cancel?
- 4 How do I move Controlfile?
- 5 What is alter database backup Controlfile?
- 6 What is alter database open Resetlogs in Oracle?
- 7 How do I recover a lost Controlfile?
How do I backup my Controlfile to trace?
A control file is a text file that Oracle uses to track the status of a database. It contains information about the database, such as the name of the database, the user who created it, and the time it was created. The control file also contains information about the datafiles that make up the database, including the name of each datafile, the size of each datafile, and the location of each datafile.
If you need to back up your control file, you can use the Oracle Export utility. The Export utility creates a text file that contains a copy of the control file. To use the Export utility, you need to know the name of the control file. You can find the name of the control file by looking in the file $ORACLE_HOME/dbs/control.ctl.
The following steps show how to use the Export utility to back up the control file:
1. Connect to the database using sqlplus.
2. Run the Export utility.
3. Enter the name of the control file.
4. Enter the name of the output file.
5. Enter the password for the user who created the database.
6. Select the export mode.
7. Enter the name of the table to be exported.
The following example shows how to use the Export utility to back up the control file:
Export Control File = /tmp/control.txt
The following example shows how to use the Export utility to back up the control file and export the table USERS:
Export Control File = /tmp/control.txt
Export Table = USERS
How do I restore a Controlfile to a different location?
If you need to restore a Controlfile to a different location, you can use the REFRESH statement. This statement will reload the Controlfile from the new location, and will also update the location in the Master File.
To use the REFRESH statement, you need to specify the name of the Controlfile, the location of the new file, and the name of the Master File.
The following example shows how to use the REFRESH statement to restore a Controlfile to a different location:
REFRESH ‘CONTROLFILE.txt’
NEW ‘C:\CONTROLFILE.txt’
MASTER ‘C:\MASTERFILE.txt’
What is meaning of recover database using backup controlfile until cancel?
Recovering a database using a backup controlfile until cancel means using a backup controlfile to bring the database online. This can be useful if the current controlfile is damaged or missing. The database can be recovered until the point at which the last backup was taken.
How do I move Controlfile?
When working with Oracle databases, you may at some point need to move the control file. The control file contains the database’s configuration information, and so must be located in the same directory as the database itself.
There are a few ways to move a control file. One is to use the ALTER DATABASE command. You can use the MOVE option to relocate the control file to a new location.
Another way to move a control file is to use the Oracle Export utility. This utility can be used to export the contents of a database to a file. The file can then be imported into a new database, or used to create a new database. When using the Export utility, you can specify the location of the control file on the command line.
Finally, you can use the Windows File Explorer to move the control file. This can be done by dragging the control file from the old location to the new location.
What is alter database backup Controlfile?
The alter database backup Controlfile command is used to create a backup of the control file for a database. The control file is a critical part of a database, and it contains information about the database, such as the name of the database, the structure of the data files, and the location of the data files. If the control file is damaged or lost, the database can’t be opened.
The alter database backup Controlfile command can be used to create a backup of the control file for a single database, or for all the databases on a server. The command can also be used to create a backup of the control file for a specific database version.
The control file can be backed up in two ways: as a text file, or as a binary file. The text file can be read by humans, but the binary file can only be read by Oracle.
The alter database backup Controlfile command is usually used to create a backup of the control file before making changes to the database, such as adding or deleting a table. If something goes wrong and the changes need to be reversed, the backup can be used to restore the control file to its previous state.
What is alter database open Resetlogs in Oracle?
Oracle alter database open Resetlogs command is used to reset the online redo log files for the database. It is used to clear the online redo log files and start a new online redo log file sequence.
The alter database open Resetlogs command can be used to reset the online redo log files for the entire database or for specific standby databases.
When the alter database open Resetlogs command is executed, the online redo log files are cleared and a new online redo log file sequence is started. The old online redo log files are not deleted, but they are no longer used.
The alter database open Resetlogs command is often used when a database is being restored from a backup. After the database is restored, the alter database open Resetlogs command can be used to reset the online redo log files and start a new online redo log file sequence.
How do I recover a lost Controlfile?
When you’re working with a database, it’s important to ensure that your control file is in a consistent state. If you lose your control file, you won’t be able to access your database. In this article, we’ll show you how to recover a lost control file.
The first thing you’ll need to do is create a new control file. To do this, open a terminal window and type the following command:
sqlplus /nolog
Then, type the following command:
CREATE CONTROLFILE REUSE SET DATABASE “DATABASE_NAME”
Make sure to replace “DATABASE_NAME” with the name of your database.
Next, you’ll need to mount the database. To do this, type the following command:
mount /u01/oracle/product/11.2.0/dbhome_1/dbs/
Make sure to replace “/u01/oracle/product/11.2.0/dbhome_1/dbs/” with the location of your Oracle home.
Next, type the following command:
sqlplus “/as sysdba”
This will launch SQL*Plus in SYSDBA mode.
Then, type the following command:
startup mount
This will mount the database.
Next, type the following command:
RECOVER DATABASE “DATABASE_NAME” USING BACKUP CONTROLFILE
Make sure to replace “DATABASE_NAME” with the name of your database.
Then, type the following command:
ALTER DATABASE “DATABASE_NAME” OPEN
Make sure to replace “DATABASE_NAME” with the name of your database.
Your database should now be open and accessible.
