Talvez você tenha usado os termos incorretos para pesquisa.
O Oracle 11g não é um banco de dados, é o cliente da Oracle.
Pesquisando "desinstalar o Oracle 11g", é exibido este primeiro lugar.
Removing Oracle Database Client with Oracle Universal Installer You first use Oracle Universal Installer to remove Oracle Database Client from the inventory on the computer. Afterwards, you must manually remove the remaining components. This section covers the following topics:
Procedure for Removing Oracle Database Client with Oracle Universal Installer 5.2.1 Guidelines for Removing Oracle Database Client with Oracle Universal Installer Follow these guidelines:
Do not manually remove Oracle Database Client components without first deinstalling with Oracle Universal Installer. An exception is if, during an installation, you exit Oracle Universal Installer using any of the following methods:
Clicking Cancel
Turning off the computer
If the installation does not complete (that is, all required configuration tools do not run at the end)
In these cases, Oracle Universal Installer does not register the installation in its inventory. However, it may have copied files to your Oracle home. Remove these files manually and restart the installation.
If you need to remove an Oracle home manually, first remove the Oracle components with Oracle Universal Installer. An example of removing the Oracle home manually would be by deleting the directory structure with Windows Explorer or the command prompt.
You should not remove the Oracle home manually first because their components remain registered in the Oracle Universal Installer inventory. If you subsequently try to install Oracle in the same home, some or all of the components selected may not be installed, since Oracle Universal Installer will determine the components are already installed.
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