To answer this question, you need to understand the purpose of the DEFINE_EDITOR parameter in SQL*Plus.
The DEFINE_EDITOR parameter in SQL*Plus is used to define the default text editor that SQL*Plus will use for editing commands or scripts. By default, SQL*Plus uses the operating system's default text editor.
Based on this information, let's go through each option to understand why it is correct or incorrect:
Option A) The emacs editor will become the SQL*Plus default text editor.
This option is correct because issuing the DEFINE_EDITOR="emacs" command will set the emacs editor as the default text editor for SQL*Plus. This means that when you use the "EDIT" command in SQL*Plus, it will open the specified command or script in the emacs editor.
Option B) The emacs editor will start running immediately.
This option is incorrect. Issuing the DEFINE_EDITOR="emacs" command does not start the emacs editor immediately. It only sets it as the default text editor for SQL*Plus.
Option C) The emacs editor will no longer be used by SQL*Plus as the default text editor.
This option is incorrect. Issuing the DEFINE_EDITOR="emacs" command actually sets the emacs editor as the default text editor for SQL*Plus, so it will continue to be used as the default editor.
Option D) The emacs editor will be deleted from the system.
This option is incorrect. Issuing the DEFINE_EDITOR="emacs" command does not delete the emacs editor from the system. It only sets it as the default text editor for SQL*Plus.
Therefore, the correct answer is:
The emacs editor will become the SQL*Plus default text editor.