How do I create a control file in Oracle?
Complete the following steps to create a new control file.
- Make a list of all datafiles and redo log files of the database.
- Shut down the database.
- Back up all datafiles and redo log files of the database.
- Start up a new instance, but do not mount or open the database: STARTUP NOMOUNT.
How do I recreate a control file?
SQL> alter database backup controlfile to trace; A trace file will be generated in the user_dump_destination directory. After navigating to the directory locate the latest trace file by date/time by issuing “ls -ltr” command. Modify the trace file and use it as a script to create the control.
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.
Where is the control file located in Oracle?
The preconfigured database contains two control files located in the ORACLE_BASE\oradata \DB_NAME directory. The preconfigured database contains two control files located in the ORACLE_BASE\oradata \DB_NAME directory.
How do I copy a control file in ASM?
How to duplicate a controlfile in ASM
- Identify the location of the current controlfile: SQL> select name from v$controlfile;
- Shutdown the database and start the instance: SQL> shutdown normal.
- Use RMAN to duplicate the controlfile:
- On the ASM instance, identify the name of the controlfile:
- On the database side:
How do I manually create a control file?
1 Answer
- Shut down the database.
- Copy an existing control file to a new location, using operating system commands.
- Edit the CONTROL_FILES parameter in the database initialization parameter file to add the new control file name, or to change the existing control file name.
- Restart the database.
How do you write a control file?
Where is the control file?
What is importance of control file in Oracle?
A control file tracks the physical components of the database. It is the root file that the database uses to find all the other files used by the database. Because of the importance of the control file, Oracle recommends that the control file be multiplexed, or have multiple identical copies.
In which mode control file is generated in Oracle Database?
If you omit both the ARCHIVELOG clause and NOARCHIVELOG clause, then Oracle Database chooses noarchivelog mode by default. After creating the control file, you can change between archivelog mode and noarchivelog mode with the ALTER DATABASE statement.
Where is the Oracle control file?
To create a control file, you must have the SYSDBAor SYSBACKUPsystem privilege. The database must not be mounted by any instance. After successfully creating the control file, Oracle mounts the database in the mode specified by the CLUSTER_DATABASEparameter.
Is this control file an Oracle managed file?
This control file is not an Oracle Managed File. If you omit any clauses, then Oracle Database uses the default values rather than the values for the previous control file. After successfully creating the control file, Oracle Database mounts the database in the mode specified by the initialization parameter CLUSTER_DATABASE.
What is the default name of the control file in Oracle?
If you are not using Oracle Managed Files, then the database creates a control file and uses a default file name. The default name is operating system specific. If you are using Oracle Managed Files, then the initialization parameters you set to enable that feature determine the name and location of the control files.
How do I Multiplex Control Files in Oracle Database?
Oracle strongly recommends that your database has a minimum of two control files and that they are located on separate physical disks. One way to multiplex control files is to store a control file copy on every disk drive that stores members of redo log groups, if the redo log is multiplexed.