这个问题说明数据库没有Mount
最好先将系统日志一并清空,避免以下报错信息:
ERROR:
ORA-28056: Writing audit records to Windows Event Log failed
OSD-246729112: Message 246729112 not found; product=RDBMS; facility=SOSD
O/S-Error: (OS 1502) The event log file is full.
ORA-01075: you are currently logged on
通过命令 sqlplus /nolog 进入
SQL> connect system/root as sysdba;
SQL> startup force;
出现这个界面，说明数据库已经打开了，然后在链接数据库就可以连上了