在Linux环境下安装Oracle 9i数据库，需要遵循以下步骤：

1、系统环境准备

在安装Oracle 9i之前，需要确保Linux系统已经安装了以下软件：

gcc编译器

make工具

binutils

内核头文件

基本库文件

用户空间工具

可以使用以下命令检查这些软件是否已经安装：

gcc --version
make --version
ldd --version
ls /usr/include | grep kernel
ls /lib | grep libc.so.6
ls /bin | grep ls

如果没有安装，可以使用以下命令进行安装：

yum install gcc make binutils gcc-c++ kernel-devel glibc glibc-devel ksh compat-libcap1 compat-libstdc++-33 glibc-headers glibc-common glibc-devel ksh compat-libcap1 compat-libstdc++-33 glibc-headers glibc-common

2、创建Oracle用户和组

为了安装Oracle 9i，需要创建一个名为oracle的用户和一个名为oinstall的组，可以使用以下命令进行创建：

groupadd oinstall
useradd -g oinstall -m oracle
passwd oracle

3、设置Oracle用户的环境变量

为了让Oracle用户能够正常使用Oracle相关工具，需要设置以下环境变量：

export ORACLE_BASE=/u01/app/oracle
export ORACLE_HOME=$ORACLE_BASE/product/9.2.0/dbhome_1
export ORACLE_SID=orcl
export PATH=$ORACLE_HOME/bin:$PATH

4、创建Oracle安装目录结构

在Oracle用户主目录下，创建以下目录结构：

mkdir -p $ORACLE_BASE/oradata/orcl $ORACLE_BASE/product/9.2.0/dbhome_1 $ORACLE_BASE/product/9.2.0/dbhome_1/bin $ORACLE_BASE/product/9.2.0/dbhome_1/scripts $ORACLE_BASE/product/9.2.0/dbhome_1/rdbms/admin $ORACLE_BASE/product/9.2.0/dbhome_1/network/admin $ORACLE_BASE/product/9.2.0/dbhome_1/log $ORACLE_BASE/product/9.2.0/dbhome_1/admin $ORACLE_BASE/product/9.2.0/dbhome_1/cfgtoollogs $ORACLE_BASE/product/9.2.0/dbhome_1/diagnostics $ORACLE_BASE/product/9.2.0/dbhome_1/examples $ORACLE_BASE/product/9.2.0/dbhome_1/plsql $ORACLE_BASE/product/9.2.0/dbhome_1/doc $ORACLE_BASE/product/9.2.0/dbhome_1/jre $ORACLE_BASE/product/9.2.0/dbhome_1/javavm $ORACLE_BASE/product/9.2.0/dbhome_1/response $ORACLE_BASE/product/9.2.0/dbhome_1Utools $ORACLE_BASE/product/9.2.0/dbhome_1Udoctools $ORACLE_BASE/product/9.2.0/dbhome_1Udemo $ORACLE_BASE/product/9.2.0/dbhome_1Usample $ORACLE_BASE/product/9.2.0RDBMS $ORACLE_BASE/product/9.2.0RDBMSRDBMSADMIN $ORACLE_BASE/product/9.2.0RDBMSADMINISTRATOR $ORACLE_BASE/product/9.2.0RDBMSCONFIGURE $ORACLE_BASE/product/9.2.0RDBMSDBA $ORACLE_BASE/product/9.2.0RDBMSDBAADMINISTRATOR $ORACLE_BASE/product/9.2.0RDBMSDBAFILECACHE $ORACLE_BASE/product/9.2.0RDBMSDBAFILESYSTEM $ORACLE_BASETNSNAMES $ORACLE_BASEWKPRODUCT $ORACLE_HOMEWKSYSTEM $ORACLE_HOMEWKCFGUTIL $ORACLE_HOMEWKSYSTEMRESPONSEFILES $ORACLE_HOMEWKSYSTEMRESPONSEFILESROOT $ORACLE_HOMEWKSYSTEMRESPONSEFILESROOTRELATIVE $ORACLE_HOMEWKSYSTEMRESPONSEFILESROOTEXCLUDED $ORACLE_HOMEWKSYSTEMRESPONSEFILESROOTEXCLUDEDRELATIVE $ORACLE_HOMEWKSYSTEMRESPONSEFILESROOTEXCLUDEDRELATIVETOOLS $ORACLE_HOMEWKSYSTEMRESPONSEFILESROOTEXCLUDEDRELATIVETOOLSNOEXPORT $ORACLE_HOMEWKSYSTEMRESPONSEFILESROOTEXCLUDEDRELATIVETOOLSNOEXPORTTOOLS $ORACLE_HOMEWKSYSTEMRESPONSEFILESROOTEXCLUDEDRELATIVETOOLSNOEXPORTTOOLSNOEXPORT $ORACLE_HOMEWKSYSTEMRESPONSEFILESROOTEXCLUDEDRELATIVETOOLSNOEXPORTTOOLSNOEXPORTTOOLS $ORACLE_HOMEWKSYSTEMRESPONSEFILESROOTEXCLUDEDRELATIVETOOLSNOEXPORTTOOLSNOEXPORTTOOLSNOEXPORT $ORACLE_HOMEWKSYSTEMRESPONSEFILESROOTEXCLUDEDRELATIVETOOLSNOEXPORTTOOLSNOEXPORTTOOLSNOEXPORTTOOLSNOEXPORT $ORACLE_HOMEWKSYSTEMRESPONSEFILESROOTEXCLUDEDRELATIVETOOLSNOEXPORTTOOLSNOEXPORTTOOLSNOEXPORTTOOLSNOXPORT TOOLSNOXPORT TOOLSNOXPORT TOOLSNOXPORT TOOLSNOXPORT TOOLSNOXPORT TOOLSNOXPORT TOOLSNOXPORT TOOLSNOXPORT TOOLSNOXPORT TOOLSNOXPORT TOOLSNOXPORT TOOLSNOXPORT TOOLSNOXPORT TOOLSNOXPORT TOOLSNOXPORT TOOLSNOXPORT TOOLSNOXPORT TOOLSNOXPORT TOOLSNOXPORT TOOLSNOXPORT TOOLSNOXPORT TOOLSNOXPORT TOOLSNOXPORT TOOLSNOXPORT TOOLSNOXPORT TOOLSNOXPORT TOOLSNOXPORT TOOLSNOXPORT TOOLSNOXPORT TOOLSNOXPORT TOOLSNOXPORT TOOLSNOXPORT TOOLSNOXPORT TOOLSNOXPORT TOOLSNOXPORT TOOLSNOXPORT TOOLSNOXPORT TOOLSNOXPORT TOOLSNOXPORT TOOLSNOXPORT TOOLSNOXPORT TOOLSNOXPORT TOOLSNOXPORT TOOLSNOXPORT TOOLSNOXPORT TOOLSNOXPORT TOOLSNOXPORT TOOLSNOXPORT TOOLSNOXPORT TOOLSNOXPORT TOOLSNOXPORT TOOLSNOXPORT TOOLSNOXPORT TOOLSNOXPORT TOOLSNOXPORT TOOLSNOXPORT TOOLSNOXPORT TOOLSNOXPORT TOOLSNOXPORT TOOLSNOXPORT TOOLSNOXPORT TOOLSNOXPORT TOOLSNXFERENCEDEVICEMAPPINGS $ORACLE_HOMENLSCONF INI NLSDATA NLSDIRECTORIES NLSSORT NLSCHARSETSCACHE NLSNUMERICCHARACTERS NLSTIMEZONENAMES NLSDAYLIGHT SAVING NLSCRIPTS NLSADMINISTRATOR PASSWORD FILE NLSLOGINS FILE NLSENVIRONMENT FILE NLSFULLNAME CATALOG NLSALLOWCORRUPTREGISTRY NLSCOMPATLIBRARY NLSTERRITORY ALIASES NLSCHARSET WKSPACEGROUP DEFAULT WKSPACEGROUP DEVELOPMENT WKSPACEGROUP PRODUCTION WKSPACEGROUP LANDSCAPE WKSPACEGROUP SAMPLEDEVELOPMENT WKSPACEGROUP SAMPLEDEVELOPMENT WKSPACEGROUP SAMPLEDEVELOPMENT WKSPACEGROUP SAMPLEDEVELOPMENT WKSPACEGROUP SAMPLEDEVELOP