How to Completely Uninstall Oracle 11G?

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To completely uninstall Oracle 11G, you can follow these steps:

  1. Backup your database: Before uninstalling Oracle 11G, it's crucial to create a backup of your existing database. This backup will help you restore the data if anything goes wrong during the uninstallation process.
  2. Stop all Oracle services: Open the Services window (type "services.msc" in the Run command) and stop all Oracle-related services, including listener, database instance, and any other associated services.
  3. Uninstall Oracle software: Open the Control Panel and navigate to "Programs and Features" (or "Uninstall a program"). Locate and select the Oracle software, such as Oracle Database, Oracle Client, Oracle SQL Developer, etc. Right-click and choose "Uninstall" to start the uninstallation process.
  4. Remove Oracle directories: After the software has been uninstalled, manually delete the Oracle installation directory and any other associated directories (e.g., Oracle Home, Oracle Inventory, etc.). These directories are typically located in the "C:\Oracle" or "C:\app" folder.
  5. Remove Oracle environment variables: Open the System Properties window (right-click on "Computer" or "My Computer" and select "Properties") and click on "Advanced system settings." In the "Advanced" tab, click on "Environment Variables." Locate any Oracle-related environment variables (e.g., ORACLE_HOME, TNS_ADMIN, PATH, etc.) and delete them.
  6. Delete Oracle registry entries: Warning: editing the registry can be risky. It is recommended to backup the registry or create a system restore point before proceeding. Open the Registry Editor (type "regedit" in the Run command) and navigate to "HKEY_LOCAL_MACHINE\SOFTWARE\ORACLE" and delete the "ORACLE" key. Also, remove any other Oracle-related keys you find in "HKEY_LOCAL_MACHINE\SOFTWARE" or "HKEY_CURRENT_USER\SOFTWARE".
  7. Remove Oracle services: Open the Command Prompt as administrator and execute the command "sc delete [servicename]" for each Oracle service you want to remove. Replace "[servicename]" with the actual Oracle service name.
  8. Clear Oracle entries from system path: Open the Command Prompt as administrator and execute the command "set PATH" to display the system path. If there are any Oracle-related paths listed (e.g., containing "Oracle" or "dbhome"), use the command "setx PATH [newpath]" to set a new path without these entries.
  9. Restart your computer: After completing all the steps, restart your computer to ensure any remaining Oracle processes or services are stopped and removed from memory.


By following these steps, you should be able to completely uninstall Oracle 11G from your system. Remember to proceed with caution and take necessary backups and precautions before making any changes to your system.

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What is the cleanest way to remove Oracle 11G from macOS?

The cleanest way to remove Oracle 11G from macOS involves the following steps:

  1. Stop all Oracle services: Open Terminal and execute the command sudo su - to switch to the root user. Then, run /usr/local/bin/dbshut to shut down all Oracle services.
  2. Remove Oracle files and directories: Execute the following commands in Terminal to delete all Oracle files and directories: rm -rf /usr/local/oracle11g/ rm -rf $HOME/Library/Oracle/ rm /etc/oratab rm /etc/listener.ora rm /etc/tnsnames.ora
  3. Remove Oracle environment variables: Open ~/.bash_profile or ~/.zshrc file in a text editor, and delete any lines related to Oracle environment variables (such as ORACLE_HOME, ORACLE_BASE, PATH additions, etc.).
  4. Remove Oracle entries from /etc/paths: Open Terminal and run sudo nano /etc/paths to open the paths file in a text editor. Delete any lines related to Oracle, save the file, and exit.
  5. Remove Oracle entries from ~/.bash_profile or ~/.zshrc: Open Terminal and run nano ~/.bash_profile or nano ~/.zshrc to open the profile file in a text editor. Delete any lines related to Oracle, save the file, and exit.
  6. Restart the system: Restart your macOS to ensure that all changes take effect.


After following these steps, Oracle 11G should be completely removed from your macOS system.


What is the best practice for uninstalling Oracle 11G?

The best practice for uninstalling Oracle 11g involves the following steps:

  1. Backup your database: Prior to uninstalling, it is crucial to backup your Oracle database to avoid any potential data loss.
  2. Stop all Oracle services: Ensure that all Oracle services, including the database, listener, and any other associated services are stopped.
  3. Uninstall Oracle software: Use the Oracle Universal Installer (OUI) to uninstall the Oracle software. The OUI can be found in the Oracle home directory under the "oui" folder. Launch the OUI and select the option to uninstall Oracle software. Follow the on-screen prompts to complete the uninstallation.
  4. Remove Oracle directories: After the software is uninstalled, manually remove the Oracle directories from the system. This may include the ORACLE_HOME directory, inventory directory, and any other directories created during the installation process.
  5. Remove Oracle entries from environment variables: Update the environment variables to remove any references to the Oracle installation. This includes the PATH variable and the ORACLE_HOME variable.
  6. Remove Oracle registry entries: Use the Windows Registry Editor (regedit) to remove any Oracle entries from the registry. Navigate to HKEY_LOCAL_MACHINE\SOFTWARE\Oracle and delete the corresponding keys.
  7. Reboot the system: Restart the system to ensure that any changes take effect.


It is important to note that the exact steps may vary slightly depending on the operating system and version of Oracle being uninstalled. It is recommended to consult the official Oracle documentation or the specific documentation for your operating system for detailed instructions.


How to uninstall Oracle 11G step by step?

To uninstall Oracle 11G, you can follow these steps:


Step 1: Stop Oracle Services

  • Open the Windows Services panel by typing "services.msc" in the Run dialog box (Windows Key + R).
  • Locate and stop all Oracle services, such as "OracleService", "OracleDBConsole", and "OracleOraDb11g_home1TNSListener" (the names may differ depending on your installation).


Step 2: Remove Oracle Software

  • Open the Control Panel and select "Programs and Features" (or "Add/Remove Programs" in older Windows versions).
  • Find and select the Oracle Database installation entry (e.g., "Oracle Database 11g"), and click "Uninstall" or "Change/Remove".
  • Follow the prompts to uninstall Oracle software. If prompted, provide the necessary credentials.


Step 3: Delete Oracle Folders

  • Go to the directory where Oracle is installed (typically under "C:\app").
  • Delete the Oracle folder, which is named "oracle" by default.


Step 4: Remove Oracle Registry Entries

  • Press Windows Key + R to open the Run dialog box.
  • Type "regedit" and press Enter to open the Registry Editor.
  • Backup the registry (File > Export), so you can restore it if needed.
  • Navigate to "HKEY_LOCAL_MACHINE\SOFTWARE\ORACLE" and delete the "ORACLE" folder.
  • Navigate to "HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services" and delete any entries related to Oracle services (e.g., OracleMTSRecoveryService, OracleService).


Step 5: Clear Environment Variables and Path

  • Right-click on My Computer (or This PC) and select "Properties."
  • Go to "Advanced system settings" or "Advanced" tab, then click "Environment Variables."
  • Under "System variables," remove any variables related to Oracle (e.g., ORACLE_HOME).
  • Edit the "Path" variable and remove any Oracle-related paths.


Step 6: Restart your computer.


After completing these steps, Oracle 11G should be completely uninstalled from your system.


How to uninstall Oracle 11G using command prompt?

To uninstall Oracle 11G using Command Prompt, follow these steps:

  1. Open the Command Prompt as an administrator. To do this, press the Windows + X keys and select "Command Prompt (Admin)".
  2. Navigate to the Oracle home directory. The default Oracle home directory is "C:\app\username". Type the following command and press Enter: cd C:\app\username
  3. Run the Oracle Universal Installer (OUI) using the following command: setup.exe -deinstall -home Replace "" with the actual path of your Oracle home directory. For example, setup.exe -deinstall -home C:\app\username\product\11.2.0\dbhome_1
  4. The Oracle Universal Installer will launch and prompt you to provide confirmation for the deinstallation process. Press Enter to continue.
  5. Follow the on-screen instructions to proceed with the uninstallation. You may be asked to provide your Oracle password during the process.
  6. Once the deinstallation process completes, you will receive a confirmation message. Press Enter to exit the Oracle Universal Installer.
  7. Verify that the Oracle home directory and related files have been removed manually. It may still exist even after the uninstallation process.


Note: Make sure to use the correct Oracle home directory path throughout these steps to avoid unintended consequences.

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