Installation and uninstallation of Windows XP Oracle 9i

During the course of this semester, the teacher asked us to install the Oracle9i database and practice the installation of the two classes. So it was easy to install, but our data center already has oracle, so the teacher asked us to uninstall it first, and then install it in practice. I hope to help people in need.
1. uninstallation of the Oracle 9i Database for Oracle 9i databases on the machine requires that the database be uninstalled first and then installed. Otherwise, an unknown error will occur during subsequent installation, as a result, the installation fails and Oracle uninstallation is troublesome. We must first stop all system services related to the Oracle 9i Database, and then run the "SC delete Oracle9i service name" command, delete all Oracle 9i services, and then check whether there are any installation files in the installation directory of Oracle 9i on the disk. If so, delete them, finally, check whether there is any Oracle registry in the Registry and delete it if any. The next step is to uninstall Oracle 9i.
1. Select the "Universal Install" option under the "Oracle Installation Products" option in the Start Menu ,:
2. In the displayed "welcome to use" dialog box, click the "Uninstall product" button in the lower right corner ,:
3. On the "Inventory directory" Page, select the Oracle 9i installation directory to be deleted, and click Delete to delete the directory ,:
4. In the displayed "OK" dialog box, click "yes" to confirm the uninstallation of Oracle 9i ,:
5. After clicking the "yes" button, the "delete" dialog box appears. You can see that Oracle 9i is being deleted ,;
6. After several minutes of waiting, the "Inventory" dialog box appears. You can see that there is no Oracle product, indicating that Oracle 9i has been uninstalled successfully. :
Ii. Installation of Oracle 9i Database (server side)
1. First, add the first installation disc of Oracle 9i to your computer. The following page appears. Click the start Installation option ,:
2. In the displayed "welcome to use" dialog box, select the "Next" button for installation ,:
3. In the open "file positioning" dialog box, enter the oracle installation directory. Do not select a directory with Chinese characters and the directory cannot contain spaces. Click "Next" to continue the installation,:
4. In the "available products" dialog box, select the first option for installation, and click "Next" to continue the installation ,:
5. In the "installation type" dialog box that appears, select Oracle for Enterprise Edition and click "Next" to continue ,:
6. In the "Database Configuration" dialog box that appears, select "general" configuration and click "Next" to continue ,:
7. In the following window, follow the default "2030" port and click "Next" to continue ,:
8. In the "Database ID" dialog box that appears, enter the database SID Name (that is, the database name) and Global name, and click Next to continue ,:
 
9. In the "database file location" dialog box that appears, enter the location of the database data file and click Next to continue ,:
10. In the "database character set" dialog box that appears, follow the default settings and click Next to continue ,:
11. In the "summary" dialog box that appears, you can see the information for installing the Oracle database. Click "Install" to start the formal installation ,:
12. During the installation process, you must change the CD. Just change it. In the "configuration tool" dialog box that appears, you can see that the Oracle database is being configured. The database configuration will appear ,:
 
13. In the displayed "Database Configuration assistant" dialog box, you can see that the database is being configured:
14. During the configuration process, the following dialog box is displayed to set the passwords of sys and system users. after entering the passwords, click the password management button ,:
 
15. In the "password management" dialog box that appears, unlock the scott user, set the password, and click "OK" to continue ,:
16. Click OK. If no error occurs, the following dialog box is displayed, indicating that the installation is complete and the Oracle 9 database is successfully installed.
 
Iii. After the installation of the Oracle 9i Database (client) database server is complete, we can install the client as follows:
1. After the installation is complete, click "next installation" to open the following dialog box:
2. Select the "Oracle9i Client 9.2.0.1.0" option on the interface to install the Client. Open the following "installation type" interface. In this dialog box, select "Administrator" as the installation type and click "Next" to continue ,:
 
3. In the "summary" dialog box, you can see some information about installing the client. Click "Install" to continue ,:
4. After clicking the "Install" button, the following dialog box is displayed. You can see the client that is installing Oracle9i ,:
5. In the "installation ended" dialog box, you can see that the Oracle9i client has been successfully installed. All the work has been completed!