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How to Update A Column Using Control File In Oracle?

3 minutes read

To update a column using a control file in Oracle, you can use the SQLLoader utility. First, create a control file that specifies the fields to be loaded and how to update the column. Then, use the SQLLoader command to load the data from the control file into the table. Make sure to specify the column to be updated in the control file and the corresponding values to be updated with. This process allows you to efficiently update a column in Oracle using data from an external file.


How to use a control file to update multiple columns at once?

To use a control file to update multiple columns at once, you can follow these steps:

  1. Create a control file: The control file is a plain text file that specifies the columns to be updated and the values to be set for each column. The control file should have a specific format that is compatible with the database system you are using.
  2. Open the control file: Use a text editor to open the control file and enter the details of the columns to be updated and the values to be set for each column. Make sure to follow the correct syntax and formatting required by the database system.
  3. Save the control file: Save the control file with a .ctl extension or any other suitable extension that is recognized by the database system you are using.
  4. Run the control file: Use the appropriate command or tool provided by the database system to run the control file and update the specified columns with the specified values. This command or tool will read the control file, parse the information in it, and execute the necessary update operations on the database.


By following these steps, you can use a control file to update multiple columns at once in a database system. Make sure to check the documentation of your database system for specific details on the format and syntax required for control files.


What is the default behavior when updating a column using a control file?

When updating a column using a control file in database systems like Oracle, the default behavior is to replace the existing data in the column with the new data specified in the control file. This means that any data that was previously stored in the column will be overwritten with the new data during the update process. It is important to be careful when updating columns using control files to ensure that the correct data is being provided and that no important information is being lost in the process.


What is the location of control files in an Oracle database?

Control files in an Oracle database are typically located in the "control_files" parameter in the database initialization parameter file (init.ora or spfile.ora). The control files are essential for the functioning of the database as they contain metadata and information about the database's physical structure, such as datafiles, redo log files, and tablespaces. They are typically stored on disk in a designated location specified by the DBA during database creation.

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