DBCA创建数据库ORA-01034 ORACLE not available，dbcaora-01034
SYMPTOMS
在利用dbca创建数据库时，当设置完成所有参数，开始装时 跑到2% 就报错 ORA-01034 ORACLE not available，
如下图
CAUSE
There's a script in ORACLE_HOME/sqlplus/admin which is called glogin.sql. This script is automatically run when the user starts SQL*PLUS or uses the Connect command, hence any command
added to it will be executed.
Checking the script, it had a "select * from v$instance;" statement added. It was always executing this statement when SQL*PLUS was started or when Connect was issued, and this statement is returning the ORA-01034 when invoking DBCA.
SOLUTION
1. Check the glogin.sql script in ORACLE_HOME/sqlplus/admin and make sure it has no statements that could cause the ORA-01034.
disable glogin.sql (mv glogin.sql glogin.sql.bak)
2. If the issue is still not resolved, then please log an SR with Oracle Support.
你在登陆数据库后它提示你已经连接到一个空闲实例，在命令行下输入ps -ef|grep ora_命令，看看是否有数据库实例，如果有可能是你ORACLE_SID设置错了，如果没有需要启动数据库。
首先可以确定的说:ORA-01034:ORACLE not available 说明你的数据库没有启动到mount状态下,执行建库脚本需要数据启动到mount下.