ORA-01102: cannot mount database in EXCLUSIVE mode
今天在STARTUP一数据库时，发生如下错误：
 
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：
 
[root@qa-oracle dbs]# fuser -u lkNDMSQA
“lkORACLE 这个文件”
lkNDMSQA:             6666(oracle)  6668(oracle)  6670(oracle)  6672(oracle)  6674(oracle)  6676(oracle)  6678(oracle)  6680(oracle)  6690(oracle)  6692(oracle)  6694(oracle)  6696(oracle)  6737(oracle)  6830(oracle)
 
果然该文件没释放，用fuser命令kill掉：
[root@qa-oracle dbs]# fuser -k lkNDMSQA
lkNDMSQA:             6666  6668  6670  6672  6674  6676  6678  6680  6690  6692  6694  6696  6737  6830
[root@qa-oracle dbs]# fuser -u lkNDMSQA
 
然后：
 
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
Database mounted.
Database opened.
SQL> 
 
数据库成功OPEN.