ORA-12520错误解决实例
今天突然发现连接数据库时报错,用pl/sql dev连接数据时,有时能连接上,有时连接时报:ORA-12520: TNS: 监听程序无法找到需要的
问题描述:
今天突然发现连接数据库时报错,用pl/sql dev连接数据时,有时能连接上,有时连接时报:
ORA-12520: TNS: 监听程序无法找到需要的服务器类型的可用句柄
通过服务器登录数据库,报下面的报连接数错误:
[Oracle@dbserver22 ~]$ sqlplus"/as sysdba"
SQL*Plus: Release 11.2.0.3.0Production on 星期五 11月 14 10:23:23 2014
Copyright (c) 1982, 2011,Oracle. All rights reserved.
ERROR:
ORA-00020: maximum number ofprocesses (150) exceeded
请输入用户名:
ERROR:
ORA-01017: 用户名/口令无效; 登录被拒绝
……
SP2-0157: 在 3 次尝试之后无法连接到ORACLE, 退出 SQL*Plus
[oracle@dbserver22 ~]$
和开发沟通了解后,是因为在昨天晚上有新业务上线,业务量增大,导致连接数上升。
解决办法:
增加进程连接数
--停掉监听
[oracle@dbserver22 ~]$ lsnrctl stop
--杀掉连接进程
[oracle@dbserver22 ~]$ ps -ef |grep LOCAL=NO | cut -c 10-15 | xargs kill -9
--增加连接数
SQL> alter system set processes=650 scope=spfile;
系统已更改。
--重启数据库
SQL> shutdown immediate
数据库已经关闭。
已经卸载数据库。
ORACLE 例程已经关闭。
SQL> startup
ORACLE 例程已经启动。
Total System Global Area1.7103E+10 bytes
Fixed Size 2245480 bytes
Variable Size 6744444056 bytes
Database Buffers 1.0335E+10 bytes
Redo Buffers 21708800 bytes
数据库装载完毕。
数据库已经打开。
SQL> exit
--启动监听
[oracle@dbserver22 ~]$ lsnrctl start
总结:
可能问题的原因很简单,但准确的定位和找出原因是需要经验和技巧的,和开发人员的沟通很重要,最终只要找出原因,解决起来可能就很简单了!
Oracle 单实例 从32位 迁移到 64位 方法
在CentOS 6.4下安装Oracle 11gR2(x64)
Oracle 11gR2 在VMWare虚拟机中安装步骤
Debian 下 安装 Oracle 11g XE R2
本文永久更新链接地址:

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