How To Install Multiple Oracle databases on one host?

This article introduces how to install two versions of Oracle Database (oracle 10g/11g) on a host.
 
The system environment uses ol5.8 and uses oracle-validate-rpm to automatically configure the oracle system environment.
 
The installation path needs to be created manually. Here, you need to prepare two paths ($ oracle_base)
 
Ora11g:
Create an ORACLE software path
Mkdir-p/u01/app/oracle/product/11.2.0/db_1
Chown oracle: dba-R/u01
Chmod 744-R/u01
 
Set SHELL parameters for oracle users:
Vi/home/oracle/. bash_profile
ORACLE_BASE =/u01/app/oracle; export ORACLE_BASE

ORACLE_HOME = $ ORACLE_BASE/product/10.2.0/db_1; export ORACLE_HOME
ORACLE_SID = ora11g; export ORACLE_SID
ORACLE_TERM = vt100; export ORACLE_TERM
TNS_ADMIN = $ ORACLE_HOME/network/admin; export TNS_ADMIN
NLS_LANG = american_america.zhs16gbk; export NLS_LANG
ORA_NLS33 = $ ORACLE_HOME/ocommon/nls/admin/data; export ORA_NLS33
LD_LIBRARY_PATH = $ ORACLE_HOME/lib:/usr/lib; export LD_LIBRARY_PATH
LIBPATH = $ ORACLE_HOME/lib: $ ORACLE_HOME/ctx/lib; export LIBPATH
ORA_DB = $ ORACLE_HOME/dbs; export ORA_DB
CLASSPATH = $ ORACLE_HOME/JRE/lib: $ ORACLE_HOME/JRE/lib/rt. jar: $ ORACLE_HOME/jlib: $ ORACLE_HOME/rdbms/jlib; export CLASSPATH
PATH = $ ORA_CRS_HOME/bin: $ ORACLE_HOME/bin: $ PATH; export PATH
 
You can use the same dba oinstall group.

Ora10:
 
User: oracle10g
 
Useradd-d/home/oracle10g-u 54322-g oinstall-G dba oracle10g
 
Create an ORACLE software path:
Mkdir-p/u02/app/oracle/product/10.2.0/db_1
Chown oracle: dba-R/u02
Chmod 744-R/u02
 
Set SHELL parameters for oracle users:
Vi/home/oracle10g/. bash_profile
ORACLE_BASE =/u02/app/oracle; export ORACLE_BASE

ORACLE_HOME = $ ORACLE_BASE/product/10.2.0/db_1; export ORACLE_HOME
ORACLE_SID = ora10g; export ORACLE_SID
ORACLE_TERM = vt100; export ORACLE_TERM
TNS_ADMIN = $ ORACLE_HOME/network/admin; export TNS_ADMIN
NLS_LANG = american_america.zhs16gbk; export NLS_LANG
ORA_NLS33 = $ ORACLE_HOME/ocommon/nls/admin/data; export ORA_NLS33
LD_LIBRARY_PATH = $ ORACLE_HOME/lib:/usr/lib; export LD_LIBRARY_PATH
LIBPATH = $ ORACLE_HOME/lib: $ ORACLE_HOME/ctx/lib; export LIBPATH
ORA_DB = $ ORACLE_HOME/dbs; export ORA_DB
CLASSPATH = $ ORACLE_HOME/JRE/lib: $ ORACLE_HOME/JRE/lib/rt. jar: $ ORACLE_HOME/jlib: $ ORACLE_HOME/rdbms/jlib; export CLASSPATH
PATH = $ ORA_CRS_HOME/bin: $ ORACLE_HOME/bin: $ PATH; export PATH

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