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What is Oracle control file?
Every Oracle database has a control file. A control file is a small binary file that records the physical structure of the database and includes: The database name. Names and locations of associated datafiles and online redo log files. The timestamp of the database creation.
Which mode is control file generated in Oracle database?
When you issue a CREATE CONTROLFILE statement, Oracle Database creates a new control file based on the information you specify in the statement. The control file resides in the location specified in the CONTROL_FILES initialization parameter.
What is Pfile and Spfile?
SPFILE is a binary file that contains the same information as the old PFILE. SPFILE permits dynamic changes without requiring you to restart that instance. If you choose to use the traditional text initialization parameter file (PFILE), you must specify the PFILE clause when issuing the STARTUP command.
What is the process to recover a control file?
To restore a backup control file to its default location:
- If the instance is still running, shut it down: SQL> SHUTDOWN ABORT.
- Correct the hardware problem that caused the media failure.
- Restore the backup control file to all locations specified in the CONTROL_FILES parameter.
- Start a new instance and mount the database.
How do I change the control name in Oracle?
To move or rename a datafile do the following.
- Shutdown the database.
- Rename the physical file on the OS.
- Start the database in mount mode.
- Issue the ALTER DATABASE RENAME FILE command to rename the file within the Oracle dictionary.
- Open the database.
How do I open a pfile file?
If you find a PFILE file on your computer or you receive a PFILE file as an email attachment you must install RMS to open the file. When RMS is installed you can simply double-click the file to open it. You will be prompted to confirm that you are authorized to view the file with a username and password.
How to create a new controlfile in SQL Server?
The first step in creating a new controlfile is to make a list of all datafiles and redo log files of the database. The redo log files will go in the LOGFILE section and the data files will go in the DATAFILE section. After the file is created you’ll need to edit the CONTROL_FILES init parameter and open the database.
How is create controlfile created in alter database?
The following CREATE CONTROLFILE statement is generated by an ALTER DATABASE BACKUP CONTROLFILE TO TRACE command for a database with data files and log files created on disk groups data and fra: This example is a CREATE CONTROLFILE statement for a database with data files, but uses a RESETLOGS clause, and thus uses the creation form for log files:
How to create a control file in Oracle?
Oracle recommends that you perform a full backup of all files in the database before using this statement. For more information, see Oracle Database Backup and Recovery Basics. Use the CREATE CONTROLFILE statement to re-create a control file in one of the following cases:
When to use the Create Control File statement?
Use the CREATE CONTROLFILE statement to re-create a control file in one of the following cases: All copies of your existing control files have been lost through media failure. You want to change the name of the database. You want to change the maximum number of redo log file groups, redo log file members,…