Oracle 18c For Exadata版本的介质已经发布，作为一名心急的老粉丝，欣喜的发现可以安装在普通的Linux平台。
但是在通过DBCA建库的时候会报ORA-12754错误，不过这也难不倒万能的网络。图形界面不行，我们还可以手工建库，前提是在参数文件中加入下面的参数。
_exadata_feature_on=true1 安装好18c做什么？一些PDB的新特性当然是要体验的，可是悲催的发现，PDB中连一些基础的数据字典视图都没有！！！
[ora18c@localhost ~]$ sqlplus '/as sysdba'
SQL*Plus: Release 18.0.0.0.0 - Production on Wed Jun 27 06:29:20 2018 Version 18.2.0.0.0
Copyright (c) 1982, 2018, Oracle. All rights reserved.
Connected to: Oracle Database 18c Enterprise Edition Release 18.0.0.0.0 - Production Version 18.2.0.0.0
SQL> SQL> SQL> show pdbs
CON_ID CON_NAME OPEN MODE RESTRICTED ---------- ------------------------------ ---------- ---------- 2 PDB$SEED READ ONLY NO 3 PDB1 MOUNTED SQL> alter pluggable database pdb1 open;
Pluggable database altered.
SQL> alter session set container=pdb1;
Session altered.
SQL> desc dba_users ERROR: ORA-04043: object dba_users does not exist
开始怀疑是PDB$SEED的问题，但18c的种子库貌似已经不能像12c那样随意open，只能作罢。
无奈之下只能再去翻官方文档，原来问题出在手工建库的过程中。简单的使用创建传统数据库的模式创建CDB数据库，才产生了上述诡异的问题。 根据官方文档，create database创建完控制文件之后，需要运行catcdba.sql脚本创建CDB相关的对象，然后再跑catalog.sql等脚本。
@?/rdbms/admin/catcdb.sql
根据提示输入
SQL> host perl -I &&rdbms_admin &&rdbms_admin_catcdb --logDirectory &&1 --logFilename &&2 Enter value for 1: /tmp Enter value for 2: create_cdb.log
Enter new password for SYS: ******** Enter new password for SYSTEM: ******** Enter temporary tablespace name: TEMP
其实这个问题在建库过程中就已经有提示，只是没有注意。
2018-06-27T06:41:39.961677 08:00 Successfully created internal service SYS$BACKGROUND at open Successfully created internal service SYS$USERS at open replication_dependency_tracking turned off (no async multimaster replication found) Starting background process AQPC 2018-06-27T06:41:40.352715 08:00 AQPC started with pid=42, OS id=23014 PDB$SEED(2):JIT: pid 22024 requesting stop PDB$SEED(2):Buffer Cache flush started: 2 PDB$SEED(2):Buffer Cache flush finished: 2 2018-06-27T06:41:40.922925 08:00 PDB$SEED(2):While transitioning the pdb 2 to clean state, clearing all its abort bits in the control file. 2018-06-27T06:41:41.482842 08:00 PDB$SEED(2):Endian type of dictionary set to little 2018-06-27T06:41:41.987095 08:00 PDB$SEED(2):Database Characterset for PDB$SEED is AL32UTF8 PDB$SEED(2):Accessing dba_registry_sqlpatch hit error: 942 Accessing dba_registry_sqlpatch hit error: 942
经过一番折腾之后，终于顺利的完成了手工创建18c CDB数据库的任务，搭建起了测试环境。
