步驟一：關閉數據庫
export ORACLE_SID=bgsp
1. sqlplus / as sysdba
2. shutdown immediate
步驟二：刪除實例相關文件
1. find $ORACLE_BASE/ -name $ORACLE_SID
2. 用命令刪除查詢后的文件
find $ORACLE_BASE/ -name $ORACLE_SID -exec rm -rf {} \;
步驟三：刪除配置文件，假設我們刪除的實例是YC
1. find $ORACLE_BASE/* -name '*[Yy][Cc]*' | grep -v admin | grep -v oradata
2. 用命令刪除查詢的文件
find $ORACLE_BASE/* -name '*[Yy][Cc]*' | grep -v admin | grep -v oradata | xargs rm -rf
步驟四：刪除實例配置文件中的信息
1. vim /etc/oratab
2. 找到yc:/opt/oracle/db/product/11g:N
3. 將該行信息刪除，並保存文件
經過以上步驟可以實現命令行干凈的刪除實例
原來這個機器上裝過oracle，卸載了，選擇之前安裝的目錄（已經刪除干凈了），就出現了 “[INS-32025] 所選安裝與指定 Oracle 主目錄中已安裝的軟件沖突” 的問題，解決辦法為：刪除C:\Program Files (x86)\Oracle\Inventory\ContentsXML目錄下的inventory.xml 文件即可。（附帶改文件內容，該目錄地址在這里被占用了，所以會報錯）
我是直接把oracle下面的文件都刪了
[12:41:16 oracle(db_1)@rhel65 database]$ ./runInstaller -silent -showProgress -ignoreSysPrereqs -responseFile /home/oracle/soft/database/response/db_install.rsp
Starting Oracle Universal Installer...
Checking Temp space: must be greater than 120 MB. Actual 7246 MB Passed
Checking swap space: must be greater than 150 MB. Actual 3999 MB Passed
Preparing to launch Oracle Universal Installer from /tmp/OraInstall2019-05-26_12-41-19PM. Please wait ...[12:41:21 oracle(db_1)@rhel65 database]$ [FATAL] [INS-32025] The chosen installation conflicts with software already installed in the given Oracle home.
CAUSE: The chosen installation conflicted with software already installed in the given Oracle home.
ACTION: Install into a different Oracle home.
[12:48:54 root()@rhel65 ~]# find / -name inventory.xml
/usr/oracle/oraInventory/backup/2019-05-18_11-49-20PM/ContentsXML/inventory.xml
/usr/oracle/oraInventory/ContentsXML/inventory.xml
[12:49:06 root()@rhel65 ~]# rm /usr/oracle/oraInventory/backup/2019-05-18_11-49-20PM/ContentsXML/inventory.xml
rm: remove regular file `/usr/oracle/oraInventory/backup/2019-05-18_11-49-20PM/ContentsXML/inventory.xml'?
[12:49:18 root()@rhel65 ~]# rm -Rf /usr/oracle/oraInventory/backup/2019-05-18_11-49-20PM/ContentsXML/inventory.xml
[12:49:23 root()@rhel65 ~]# rm -Rf /usr/oracle/oraInventory/ContentsXML/inventory.xml