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If your TNS entry is incorrect for your current configuration, for example you specify (SERVER = SHARED) in your connection descriptor, but you have not configured shared servers, you will receive this error. But since you said you had not changed anything and this error had occurred suddenly, I am going to assume your configuration is correct. In that ...


Oracle provides a deinstallation tool starting with Oracle 11. It's located in $ORACLE_HOME/deinstall/ (in your case the old Homes). It takes care of the inventory and remote hosts in case of a RAC.

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