Efficient Ways to Delete Oracle Control Files A Guide（oracle删除控制文件）

Whether you are a Unix administrator, database administrator, or simply a user, you want to make sure that your Oracle Control files are maintained properly. Oracle control files keep crucial information about your system and databases, so when it comes to clearing out the clutter, these are one of the targets. In this guide, we will discuss some of the more efficient ways to delete Oracle control files.

First and foremost, make sure you always take a backup of any control files you plan on deleting. This should be done by using either RMAN or any other approved backup utility. This is to ensure that you have a reliable way to recover your control files in the event of a catastrophic failure.

Once you have made a copy of your control files, you can start deleting them. The most common way to do this is to connect to the database and issue the ALTER DATABASE RENAME FILE command for each control file that you want to delete. Note that you may also need to use the ALTER DATABASE CLOSE DATA FILES command before this command can be issued. It is important to be sure you can use this technique safely, as it can potentially cause log file corruption if used incorrectly.

Once you have issued the ALTER DATABASE commands, you can start deleting the control files. This can be done either through SQL*Plus, or the operating system-specific shell commands. If you decide to use SQL*Plus, use the following command to delete the physical files:

“`sql

sql>delete from dba_data_files where file_name = ‘file_name_for_control_file’;

This command will delete the specified control from the database, but it will not delete the physical file itself. To do that, you should use the operating system-specific file removal utility. For example, on Linux, you can use the ‘rm’ command, or a combination of ‘rm’ and ‘find’ to delete the control files you want.

Once you have deleted the physical files, you should also clean up anyleftover entries in the data dictionary. This is done by issuing the following command in SQL*Plus: 

```sql
    sql>exec dbms_utility.clean_name('file_name_for_control_file');

This will remove the corresponding entry from the data dictionary.

Finally, after completing the steps mentioned above, you should check the alert log for any errors. This can be done by using the following command in SQL*Plus:

“`sql

sql>select * from v$diag_info;

This will show you any errors that were encountered during the process.
By following the steps outlined in this guide, you can efficiently remove Oracle control files from your database. It is important to remember to always take backups of your control files and to be sure that you use the correct command to delete the physical files. Additionally, be sure to check the alert log for any errors after completing the process.