一。安装Oracle Grid Infrastructure
    1.下载19cgrid安装包
    2.创建安装目录

    1. 18C 路径
    2. /opt/app/18.0.0.0/grid
    3. ----------------------------
    4. mkdir /opt/app/19.3.0.0/grid -p
    5. chown grid:oinstall /opt/app/19.3.0.0 -R

    3.解压文件

    4.安装19c Grid Infrastructure
    预安装配置19c

    1. yum install oracle-database-preinstall-19c.x86_64

    xterm安装

    1. su  - grid
    2. cd /opt/app/19.3.0.0/grid
    3. ./gridSetup.sh

    5.重新设置环境变量

    1. export ORACLE_SID=+ASM1
    2. export ORACLE_BASE=/opt/app/grid
    3. export ORACLE_HOME=/opt/app/19.3.0.0/grid
    4. export LD_LIBRARY_PATH=$ORACLE_HOME/lib:$LD_LIBRARY_PATH
    5. export PATH=$ORACLE_HOME/bin:$PATH
    6. alias asmcmd='rlwrap asmcmd'
    7. alias sqlplus='rlwrap sqlplus'
    8. export PATH

    6.数据库安装，dbua升级
    1）Starting with Oracle Database Release 18, APEX is not upgraded automatically as part of the database upgrade.
    从oracle 18开始apex不支持自动数据库升级。