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How do I determine the size of a control file?

How do I determine the size of a control file?

How to Check Control File Size

  1. V$CONTROLFILE_RECORD_SECTION. Query v$controlfile_record_section.
  2. RMAN Backup Size. By an indirect approach, to backup current control file in order to check the control file size.
  3. V$CONTROLFILE. For 11g, query V$CONTROLFILE directly.
  4. ASMCMD.
  5. Raw Device.

How do I view a control file?

How to Find Control File in Oracle

  1. The database name.
  2. The timestamp of database creation.
  3. The names and locations of associated data files and redo log files.
  4. Tablespace information.
  5. Data file offline ranges.
  6. The log history.
  7. Archived log information.
  8. Backup set and backup piece information.

How do I recover a control file?

To restore a backup control file to its default location:

  1. If the instance is still running, shut it down: SQL> SHUTDOWN ABORT.
  2. Correct the hardware problem that caused the media failure.
  3. Restore the backup control file to all locations specified in the CONTROL_FILES parameter.
  4. Start a new instance and mount the database.

How do I restore a control file?

You can restore the control file from a known control file copy using this form of the command: RMAN> RESTORE CONTROLFILE from ‘filename’; The control file copy found at the location specified by filename will be written to all locations listed in the CONTROL_FILES initialization parameter.

How do I reduce the size of my Oracle database?

Go through your tablespaces and run “drop tablespace including contents and datafiles” will reduce it’s size quickly!

Where is the Oracle control file?

The preconfigured database contains two control files located in the ORACLE_BASE\oradata \DB_NAME directory. Oracle recommends that you keep at least two control files (on separate physical drives) for each database, and set the CONTROL_FILES initialization parameter to list each control file.

How many control files should Oracle Database have?

Every Oracle database should have at leasttwo control files, each stored on a different disk. If a control file is damaged due to a disk failure, the associated instance must be shut down.

How is the size of a control file determined?

The main determinants of the size of a control file are the values set for the MAXDATAFILES, MAXLOGFILES, MAXLOGMEMBERS, MAXLOGHISTORY, and MAXINSTANCES parameters in the CREATE DATABASE statement that created the associated database. Increasing the values of these parameters increases the size of a control file of the associated database.

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:

What is the default name for control files in Oracle?

If you do not specify files for CONTROL_FILESbefore database creation, and you are not using the Oracle Managed Filesfeature, Oracle creates a control file and uses a default filename. The default name is operating system specific. Multiplex Control Files on Different Disks