What is control file multiplexing?

  November 9, 2019
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What is control file multiplexing?

Multiplexing is the process of mintaining a copy of same control files on different disk drivers (and idealy on different controllers). To multiplex your control files, we copy the control file to multiple locations and change the CONTROL_FILES parameter in the text based initialization file init.

How can you manage the control files?

Steps for Creating New Control Files

  1. Make a list of all datafiles and redo log files of the database.
  2. Shut down the database.
  3. Back up all datafiles and redo log files of the database.
  4. Start up a new instance, but do not mount or open the database: STARTUP NOMOUNT.

Which type of file multiplexing does Oracle recommend?

Oracle recommends that you multiplex at least two copies of the control files on mirrored disks. This precaution allows transparent recovery of single failures, and retains fast recovery of the control file data in the case of double failure.

How can you read the content of your control files?

Answer: To see the controlfile contents, use these steps: SQL> alter database backup controlfile to trace; We can now view the controlfile contents (as a “create database” statement) by looking for the latest file in the user_dump_dest directory.

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 current log sequence number.

Where are Oracle control files located?

ORACLE_BASE\oradata \DB_NAME directory
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.

What is the control file in Oracle?

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?

ORACLE_BASE\oradata \DB_NAME

What are all the information that is stored in 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 current log sequence number.

How do I manually create a control file in Oracle 11g?

1 Answer

  1. Shut down the database.
  2. Copy an existing control file to a new location, using operating system commands.
  3. 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.
  4. Restart the database.