ORA-01102 解决思路
ORA-01102 解决思路位于ORALCE_HOME下的dbs目录下,发现是lk文件造成的。
一、出现的现象:
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
二、解决的方法:
解决方法一:重启机器,能够解决(注意,需要察看环境变量中SID和自己创建数据库的SID是否一致)
解决方法二:位于ORALCE_HOME下的dbs目录下,发现是lk文件造成的。
使用fuser -k lk 就解决。
三、产生原因分析:
由于我在创建数据库的时候,环境变量中的设置的SID和我实际创建数据库的SID不一致,所以造成了数据库误认为,我同时运行两个实例。lk实际就是防止两个实例同时并发运行。
四、解决此类错误的流程:
当发生1102错误时,可以按照以下流程检查、排错:
1.如果是HA系统,检查其他节点是否已经启动实例;
2.检查Oracle进程是否存在,,如果存在则杀掉进程;
3.检查信号量是否存在,如果存在,则清除信号量;
4.检查共享内存段是否存在,如果存在,则清除共享内存段;
5.检查锁内存文件lk和sgadef.dbf是否存在,如果存在,则删除。

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