1.手工删除Oracle安装时建立的各目录、文件等。这种方法对于Linux还算可行，但是Window版中涉及到服务、注册表等等。往往删除不干净。

2.使用安装目录$ORACLE_HOME/deinstall/下的 deinstall脚本。

[oracle@localhost deinstall]$ ./deinstall

Checking for required files and bootstrapping ...

Please wait ...

Location of logs /tmp/deinstall2015-08-22_00-06-37AM/logs/

############ ORACLE DEINSTALL & DECONFIG TOOL START ############

######################### CHECK OPERATION START #########################

## [START] Install check configuration ##

Checking for existence of the Oracle home location /u01/app/oracle/product/11.2.0/db_1

Oracle Home type selected for deinstall is: Oracle Single Instance Database

Oracle Base selected for deinstall is: /u01/app/oracle

Checking for existence of central inventory location /u01/app/oraInventory

Checking for sufficient temp space availability on node(s) : 'localhost.localdomain'

## [END] Install check configuration ##

Network Configuration check config START

Network de-configuration trace file location: /tmp/deinstall2015-08-22_00-06-37AM/logs/netdc_check2015-08-22_12-06-57-AM.log

Network Configuration check config END

Database Check Configuration START

Database de-configuration trace file location: /tmp/deinstall2015-08-22_00-06-37AM/logs/databasedc_check2015-08-22_12-07-12-AM.log

Use comma as separator when specifying list of values as input

Specify the list of database names that are configured in this Oracle home [orcl]:

###### For Database 'orcl' ######

Single Instance Database

The diagnostic destination location of the database: /u01/app/oracle/diag/rdbms/orcl

Storage type used by the Database: FS

Database file location: /u01/app/oracle/oradata/orcl,/u01/app/oracle/fast_recovery_area/orcl

Fast recovery area location: /u01/app/oracle/fast_recovery_area/ORCL

database spfile location: /u01/app/oracle/product/11.2.0/db_1/dbs/spfileorcl.ora

The details of database(s) orcl have been discovered automatically. Do you still want to modify the details of orcl database(s)? [n]:

Database Check Configuration END

Enterprise Manager Configuration Assistant START

EMCA de-configuration trace file location: /tmp/deinstall2015-08-22_00-06-37AM/logs/emcadc_check2015-08-22_12-07-52-AM.log

Checking configuration for database orcl

Enterprise Manager Configuration Assistant END

Oracle Configuration Manager check START

OCM check log file location : /tmp/deinstall2015-08-22_00-06-37AM/logs//ocm_check446.log

Oracle Configuration Manager check END

######################### CHECK OPERATION END #########################

####################### CHECK OPERATION SUMMARY #######################

Oracle Home selected for deinstall is: /u01/app/oracle/product/11.2.0/db_1

Inventory Location where the Oracle home registered is: /u01/app/oraInventory

The following databases were selected for de-configuration : orcl

Database unique name : orcl

Storage used : FS

No Enterprise Manager configuration to be updated for any database(s)

No Enterprise Manager ASM targets to update

No Enterprise Manager listener targets to migrate

Checking the config status for CCR

Oracle Home exists with CCR directory, but CCR is not configured

CCR check is finished

Do you want to continue (y - yes, n - no)? [n]: y

A log of this session will be written to: '/tmp/deinstall2015-08-22_00-06-37AM/logs/deinstall_deconfig2015-08-22_12-06-51-AM.out'