ORA-12528: TNS:listener: all appropriate instances are blocking new connections

Oracle問題：ORA-12528: TNS: 監聽程序: 全部適用例程都沒法創建新鏈接

問題原始描述：

ORA-12528: TNS:listener: all appropriate instances are blocking new connections

發現問題：

經過在CMD下用lsnrctl status 查看出的問題：發現BLOCKED；

而後：嘗試啓動oracle數據庫：

[root@MyYun ~]# su - oracle
Last login: Thu Jul 18 22:01:58 CST 2019 on pts/1
[oracle@MyYun  ~]$ sqlplus / as sysdba
SQL> startup nomount;
ORACLE instance started.

Total System Global Area 1068937216 bytes
Fixed Size          2220200 bytes
Variable Size         394268504 bytes
Database Buffers      666894336 bytes
Redo Buffers            5554176 bytes
SQL> select status from v$instance;

STATUS
------------
STARTED

SQL> exit
Disconnected from Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options

執行上代碼塊的操做後，在本地使用第三方連接工具連接Oracle數據庫時就出現了ORA-12528錯誤。

解決辦法以下：

相繼執行以下命令：

[oracle@MyYun~]$ sqlplus / as sysdba

SQL*Plus: Release 11.2.0.1.0 Production on Thu Jul 18 22:55:06 2019

Copyright (c) 1982, 2009, Oracle.  All rights reserved.

Connected to an idle instance.

SQL> shutdown;
ORA-01034: ORACLE not available
ORA-27101: shared memory realm does not exist
Linux-x86_64 Error: 2: No such file or directory
SQL> startup
ORACLE instance started.

Total System Global Area 1068937216 bytes
Fixed Size          2220200 bytes
Variable Size         394268504 bytes
Database Buffers      666894336 bytes
Redo Buffers            5554176 bytes
Database mounted.
exDatabase opened.
SQL> exit;
Disconnected from Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options

命令解釋：

• shutdown命令： 至關於如下三個命令

normal;
shutdown immediate;
shutdown abort;

• startup命令： 等於如下三個命令

startup nomount;
alter database mount;
alter database open;