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What is a control file?

What is 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. The current log sequence number.

How do you create a control file?

Complete the following steps to create a new control file.

  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.

How do I read a control file?

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.

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.

Where is the control file?

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.

What is content in control file?

Contents[edit] The control file contains information like: Database name. Timestamp of database creation. Names and locations of Data Files. Names and locations of Redo Log files.

How do I create a control file without backup?

  1. Edit your init.ora and add multiple control files in the.
  2. Gather a list of all the database datafiles and log file locations.
  3. Create the controlfile script, eg:
  4. Log into sqlplus and run the script.
  5. Shutdown and backup your database.
  6. Start your database normally then configure RMAN to do controlfile.

What is SAP control file?

Every Oracle Database has a control file, which is a small binary file that records the physical structure of the database. The control file includes: The database name. Names and locations of associated datafiles and redo log files. The timestamp of the database creation.

How do I run a CTL file in command prompt?

In Windows, you can run SQL loader from command prompt via the following ways:

  1. Command Line Reference. sqlldr scott/[email protected] data=C:\data\emp. csv control=c:\ctl\empctl. ctl log=c:\temp\sqllog.
  2. Using batch script. Save the above sqlldr command in the batch file with extension . bat.

How do I fix a corrupted control file?

Recovering from Control File Corruption Using a Control File Copy

  1. With the instance shut down, use an operating system command to overwrite the bad control file with a good copy: % cp /u03/oracle/prod/control03.ctl /u02/oracle/prod/control02.ctl.
  2. Start SQL*Plus and open the database: SQL> STARTUP.

What happens if we delete control file?

Option 1. It will ask redo log files, then u will have to apply all redo log files.

How do you create a control file in SAP?

For creating oracle control File follow the procedure as below on Source System:

  1. Create control.sql by executing the command at the productive system, below;
  2. Goto “/oracle//saptrace/usertrace” and open newly created trace file,
  3. Now that you have a control.
  4. Delete all control files on the database.

What is a control file in access?

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. The current log sequence number.

How do I Create Control Files in a database?

You specify control file names using the CONTROL_FILESinitialization parameter in the database’s initialization parameter file (see “Creating Initial Control Files”). The instance startup procedure recognizes and opens all the listed files. The instance writes to and maintains all listed control files during database operation.

How do I read data from a control file?

If your data is in the control file itself, use an asterisk instead of the filename. If you have data in the control file as well as datafiles, you must specify the asterisk first in order for the data to be read. os_file_proc_clause

Is the control file character set different from the datafile character set?

If the control file character set is different from the datafile character set, keep the following issue in mind. Delimiters and comparison clause values specified in the SQL*Loader control file as character strings are converted from the control file character set to the datafile character set before any comparisons are made.