ORA-01102: cannot mount database in EXCLUSIVE mode

SQL> conn /as sysdba
Connected to an idle instance.
SQL> startup
ORACLE instance started.
Total System Global Area  276824064 bytes
Fixed Size                   778736 bytes
Variable Size             137371152 bytes
Database Buffers          138412032 bytes
Redo Buffers                 262144 bytes
ORA-01102: cannot mount database in EXCLUSIVE mode
SQL> shutdown immediate
ORA-01507: database not mounted

ORACLE instance shut down.

 

 GOOGLE一下，发现是lk<SID>文件造成的，该文件位于ORALCE_HOME下的dbs目录下，马上检查该文件：

 

未发现该文件

 

关于该错误更详细的介绍如下：原文链接：http://www.hellodba.com/cases/case-unexception_down.htm

 

还有些原因是内存未释放，信号量的问题，直接重启机器，问题解决