Fully uninstall and correctly install oracle

1. Choose "start"> "Settings"> "Control Panel"> "Administrative Tools"> "services" to stop all Oracle services. 2. Start-> Program-> Oracle-OraHome81-> Oracle Installation Products-> Universal Installer uninstalls all Oracle Products, but the Universal Installer itself cannot be deleted. 3. Run regedit, select HKEY_LOCAL_MACHINE \ SOFTWARE \ ORACLE, and press del to delete the entry. 4. Run regedit and select HKEY_LOCAL_MACHINE \ SYSTEM \ CurrentControlSet \ Services. Scroll through the list and delete all Oracle entries. Run refedit, HKEY_LOCAL_MACHINE \ SYSTEM \ CurrentControlSet \ Services \ Eventlog \ Application to delete all Oracle entries. 6. Choose "start"> "Settings"> "Control Panel"> "system"> "advanced"> "environment variable" to delete Oracle settings in the environment variables CLASSPATH and PATH. 7. Delete All Oracle groups and icons from the desktop> STARTUP group> program menu. 8. Delete the \ Program Files \ Oracle directory. 9. restart the computer to completely delete the Oracle directory. 10. Delete Oracle-related files, select the default Oracle directory C: \ Oracle, delete the entry directory and all subdirectories, and run the Windows 2000 directory (generally C: \ WINNT) to delete the following file ORACLE. INI, oradim73.INI, oradim80.INI, oraodbc. ini and so on. Delete the [ORACLE] markup section in the www.2cto.com 11 and WIN. ini files. 12. If necessary, delete all odbc dsn related to Oracle. 13. In Event Viewer, delete Oracle-related logs. NOTE: If some DLL files cannot be deleted, You can restart and start new installation. Select a new directory during installation. After the installation is completed and restarted, the old directory and files can be deleted. 2. Three Steps for successful oracle Installation: 1. install 2. create a database 3. configuration (there are at least four services after the installation is successful, but you only need to start OracleOraDb10g_home1TNSListenerLISTENER2 and OracleServiceMYDATA: Memory listener and service: :) for oracle processing installed 1. (Create a database) start> program> Oracle> OraDb10g_home1> Configure and port the tool> Database Configuration Assistant> next> delete Database> select the Database to be deleted> complete (the password of the original Database is unknown, delete and re-create a service) or cmd delete the service: the SC delete service name only needs to keep a listner www.2cto.com and start-> Program-> Oracle-OraDb10g_home1> Configuration and porting tools> Database Confi Guration Assistant> next> Create Database mydata> general purpose> Database Name> password 2. (configuration) start> program> Oracle> OraDb10g_home1> Configure and transplant tool> Net Configuration Assistant> Local net server Configuration> next> enter the newly created database mydata> host name 127.0.0.1> Other if the following fields are displayed, correct: Connecting... ORA-01017: invalid username/password; logon denied test failed. Then you can change the user name and password to the author peonyzzdx.