ORA-27101: shared memory realm does not exist

今天连接oracle报错：ORA-27101: shared memory realm does not exist，排查过程如下：

1、查看内存是否有空余：

free

内存如下，说明内存好的：

2、查看磁盘是否有空余：

df -h

发现磁盘已经满了,有可能磁盘满了导致服务停了

3、用 "du -h --max-depth=1 "命令，最终定位到是redis日志占了20g，删掉redis日志后，执行如下命令

[root@k8s-master log]# su -l oracle
Last login: Tue Jul  2 10:27:46 CST 2019 on pts/0
-bash: /etc/profile: Permission denied
-bash: /etc/profile: line 53: syntax error near unexpected token `then'
-bash: /etc/profile: line 53: `if[ $USER = "oracle" ]; then'
[oracle@k8s-master ~]$ sqlplus /nologSQL*Plus: Release 12.1.0.2.0 Production on Tue Jul 2 10:46:25 2019Copyright (c) 1982, 2014, Oracle.  All rights reserved.SQL> connect / as sysdba
Connected to an idle instance.
SQL> startup
ORACLE instance started.Total System Global Area 2449473536 bytes
Fixed Size          2927336 bytes
Variable Size         654312728 bytes
Database Buffers     1778384896 bytes
Redo Buffers           13848576 bytes
Database mounted.
Database opened.
SQL>

4、再次连接oracle，一切正常

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ORA-27101: shared memory realm does not exist

1、查看内存是否有空余：

2、查看磁盘是否有空余：

3、用 "du -h --max-depth=1 "命令，最终定位到是redis日志占了20g，删掉redis日志后，执行如下命令

4、再次连接oracle，一切正常

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