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从Oracle 12.2开始，默认APEX不会被安装，虽然仍然可以在ORACLE_HOME/apex下找到安装文件，但是仅仅是放在那里而已，没有安装。这样做的好处是在创建PDB时不用再担心要先卸载APEX。

当然，如果要使用APEX的话就需要手动安装了。不建议安装默认的版本，最好重新下载最新版的APEX。需要注意的是，在安装时应该将APEX安装在PDB中，而不是root容器。

下载后，先解压：

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[oracle@orcl apex]$ ls
apex  apex_5.1.4.zip
[oracle@orcl apex]$ pwd
/home/oracle/apex
[oracle@orcl apex]$ cd apex/
[oracle@orcl apex]$ ls
apex_epg_config_cdb.sql    apex_rest_config_nocdb.sql  apxe102.sql        apxremov_cdb.sql      core
apex_epg_config_core.sql   apex_rest_config.sql        apxe111.sql        apxremov_nocdb.sql    coreins2.sql
apex_epg_config_nocdb.sql  appins.sql                  apxe112.sql        apxremov.sql          coreins3.sql
apex_epg_config.sql        apxchpwd.sql                apxe121.sql        apxrtins_cdb.sql      coreins4.sql
apexins1.sql               apxconf.sql                 apxexit.sql        apxrtins_cdb_upg.sql  coreins5.sql
apexins2.sql               apxdbmig.sql                apxldimg_core.sql  apxrtins_nocdb.sql    coreins.sql
apexins3.sql               apxdevrm_cdb.sql            apxldimg.sql       apxrtins.sql          devins.sql
apexins_cdb.sql            apxdevrm_nocdb.sql          apxpatch.sql       apxsdoins.sql         endins.sql
apexins_cdb_upg.sql        apxdevrm.sql                apxpreins.sql      apxsqler.sql          gen_adm_pwd.sql
apexins_nocdb.sql          apxdvins_cdb.sql            apxprereq.sql      apxupgrd.sql          images
apexins.sql                apxdvins_nocdb.sql          apxrelod.sql       apxxemig.sql          load_trans.sql
apex_rest_config_cdb.sql   apxdvins.sql                apxremov1.sql      builder               utilities
apex_rest_config_core.sql  apxe101.sql                 apxremov2.sql      catapx.sql
[oracle@orcl apex]$

在解压后的apex目录下，以DBA用户登录到数据库中：

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[oracle@orcl apex]$ sqlplus / as sysdba
SQL*Plus: Release 12.2.0.1.0 Production on Fri Mar 30 16:51:48 2018
Copyright (c) 1982, 2016, Oracle.  All rights reserved.
Connected to:
Oracle Database 12c Enterprise Edition Release 12.2.0.1.0 - 64bit Production
SQL>

在PDB中，为APEX创建专用的表空间：

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SQL> CREATE TABLESPACE apex DATAFILE '/u01/app/oracle/oradata/orcl/apex_tbs.dbf'  SIZE 300M AUTOEXTEND ON NEXT 10M;
Tablespace created.

开始安装：

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SQL> @apexins.sql APEX APEX TEMP /i/

经过几十分钟，会看到：

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...
Thank you for installing Oracle Application Express 5.1.4.00.08
Oracle Application Express is installed in the APEX_050100 schema.
The structure of the link to the Application Express administration services is as follows:
http://host:port/pls/apex/apex_admin (Oracle HTTP Server with mod_plsql)
http://host:port/apex/apex_admin     (Oracle XML DB HTTP listener with the embedded PL/SQL gateway)
http://host:port/apex/apex_admin     (Oracle REST Data Services)
The structure of the link to the Application Express development interface is as follows:
http://host:port/pls/apex (Oracle HTTP Server with mod_plsql)
http://host:port/apex     (Oracle XML DB HTTP listener with the embedded PL/SQL gateway)
http://host:port/apex     (Oracle REST Data Services)
timing for: Phase 3 (Switch)
Elapsed: 00:03:24.18
timing for: Complete Installation
Elapsed: 00:25:38.64
PL/SQL procedure successfully completed.
1 row selected.
...null1.sql
SYS>

修改密码，注意密码必须包含大写字母，数字，以及特殊符号，比如 Welcome1#：

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SQL> @apxchpwd.sql
================================================================================
This script can be used to change the password of an Application Express
instance administrator. If the user does not yet exist, a user record will be
created.
================================================================================
Enter the administrator's username [ADMIN]
User "ADMIN" does not yet exist and will be created.
Enter ADMIN's email [ADMIN]
Enter ADMIN's password []
Created instance administrator ADMIN.
SQL>

继续配置REST API的用户密码，为方便起见，都设置为Welcome1#：

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SQL> @apex_rest_config.sql
Enter a password for the APEX_LISTENER user              []
Enter a password for the APEX_REST_PUBLIC_USER user              []
...create APEX_LISTENER and APEX_REST_PUBLIC_USER users
SQL>

加载图片资源：

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SQL> @apex_epg_config.sql /home/oracle/apex/
. Loading images directory: /home/oracle/apex//apex/images
timing for: Load Images
Elapsed: 00:02:10.24

查询，配置端口以及设置用户权限：

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SQL> SELECT DBMS_XDB.gethttpport FROM DUAL;
GETHTTPPORT
-----------
          0
SQL> EXEC DBMS_XDB.sethttpport(8080);
SQL> SELECT DBMS_XDB.gethttpport FROM DUAL;
GETHTTPPORT
-----------
       8080
SQL> ALTER USER APEX_PUBLIC_USER ACCOUNT UNLOCK;
SQL> ALTER USER ANONYMOUS ACCOUNT UNLOCK;
SQL> ALTER USER XDB ACCOUNT UNLOCK;
SQL> ALTER USER FLOWS_FILES ACCOUNT UNLOCK;
SQL> ALTER USER APEX_INSTANCE_ADMIN_USER ACCOUNT UNLOCK;
SQL>

这时就可以通过 http://localhost:8080/apex/apex_admin 来访问APEX的管理页面，用户名密码为 ADMIN/Welcome1#.

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