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Steps to completely uninstall Oracle 12c on Windows7

Click uninstall the 1.bat file directly

Open the database installation path, such as: C:\ app\ zhunli\ virtual\ product\ 12.2.0\ dbhome_1\ * .bat. Click to uninstall the bat file and wait for the uninstall

two。 Open the registry program, press [win+R]-> enter [regedit]-> [enter], and delete the following path / key / value:

HKEY_LOCAL_MACHINE\ SYSTEM\ CurrentControlSet\ Services\ remove all service names that start with oracle under this path, OracleVssWriterORCL+OracleServiceORCL+OracleOraDB12Home1TNSListener+OracleOraDB12Home1MTSRecoveryService+OracleJobSchedulerORCL).

HKEY_LOCAL_MACHINE\ SOFTWARE\ ORACLE deletes the oracle directory, where the software installation information for the Oracle database is registered

HKEY_USERS\ Smur1-5-21-1302337871-3542686902-227442817\ Software\ Microsoft\ Windows\ CurrentVersion\ Explorer\ StartPage\ NewShortcuts remove all shortcuts that contain Oracle.

Delete environment variables related to oracle settings: right-click my computer-> Properties-> Advanced-> Environment variables on the desktop: delete the following environment variables or values

4.1 remove the NLS_LANG environment variable. The default is SIMPLIFIED CHINESE_CHINA.ZHS16GBK.

4.2 remove the ORACLE_HOME environment variable. The default value is C:\ app\ Administrator\ product\ 12.1.0\ dbhome_1

4.3 remove the ORACLE_SID environment variable. The default is ORCL.

4.4 remove the C:\ app\ Administrator\ product\ 12.1.0\ dbhome_1\ bin; string from the Path environment variable

4.5 remove the TNS_ADMIN environment variable. The default value is C:\ app\ Administrator\ product\ 12.1.0\ dbhome_1\ NETWORK\ ADMIN

HKEY_LOCAL_MACHINE\ SYSTEM\ CurrentControlSet\ Services\ Eventlog\ Application deletes all entries in the registry that begin with oracle

Restart the operating system.

6. Delete the directory related to the Oracle program after restart. Include the installation directory (C:\ app) + system configuration directory (C:\ Program Files\ oracle).

7. Delete the Oracle item under the start menu (C:\ Users\ Administrator\ Oracle) after reboot.

At this point, the Oracle under Windows7 is completely uninstalled, and no errors are reported when you rerun the Oracle installation.

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