SYMPTOMS
在利用dbca创建数据库时，当设置完毕全部參数。開始装时 跑到2% 就报错 ORA-01034 ORACLE not available，
例如以下图
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.