ORA-00020: maximum number of processes (150) exceeded

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#ORA-00020 #进程数

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本文介绍了在遇到ORA-00020错误时，即数据库最大连接数超出限制的问题。文章详细描述了故障情况，分析了无法登录数据库并尝试通过重启服务器进行故障排查的场景，最后提醒了恢复服务时开启监听和注册的注意事项。

1、故障描述

厂家反映数据库连不上
这里写图片描述

登上去看，报ORA-00020，数据库连接数达到了数据库的最大连接数

[oradba@szpwgddb01:/oracle/app/product/11.2.0/db_1/dbs]$ sqlplus / as sysdba

SQL*Plus: Release 11.2.0.4.0 Production on Thu Mar 8 15:09:42 2018

Copyright (c) 1982, 2013, Oracle.  All rights reserved.

ERROR:
ORA-00020: maximum number of processes (150) exceeded

2、故障分析

数据库已经登不进去了，查看 $ORACLE_HOME/dbs/ 下也没有pfile文件，只能申请服务器重启

3、故障解决

[oradba@szpwgddb01:/home/oradba]$ sqlplus / as sysdba

SQL*Plus: Release 11.2.0.4.0 Production on Thu Mar 8 15:17:33 2018

Copyright (c) 1982, 2013, Oracle.  All rights reserved.

Connected to an idle instance.

SQL> startup
ORACLE instance started.

Total System Global Area 5010685952 bytes
Fixed Size                  2261848 bytes
Variable Size             939527336 bytes
Database Buffers         4060086272 bytes
Redo Buffers                8810496 bytes
Database mounted.
Database opened.

SQL> show parameter processes;

NAME                                 TYPE        VALUE
------------------------------------ ----------- ------------------------------
aq_tm_processes                      integer     1
db_writer_processes                  integer     1
gcs_server_processes                 integer     0
global_txn_processes                 integer     1
job_queue_processes                  integer     1000
log_archive_max_processes            integer     4
processes                            integer     150

SQL> alter system set processes=500 scope=spfile;

System altered.

SQL> create pfile from spfile;

File created.

SQL> shutdown immediate;

SQL> startup

SQL> show parameter processes;

NAME                                 TYPE        VALUE
------------------------------------ ----------- ------------------------------
aq_tm_processes                      integer     1
db_writer_processes                  integer     1
gcs_server_processes                 integer     0
global_txn_processes                 integer     1
job_queue_processes                  integer     1000
log_archive_max_processes            integer     4
processes                            integer     500   --修改成功

别忘记开监听并注册