ORA-12537:TNS:connectionclosed错误处理过程

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1，同事说oracle测试换了连接不上了，报错如下

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<code class=" hljs ruby">[[email protected] admin]$ rlwrap sqlplus powerdesk/[email protected]
 
SQL*Plus: Release 11.2.0.1.0 Production on Mon Nov 23 14:16:31 2015
 
Copyright (c) 1982, 2009, Oracle.  All rights reserved.
 
ERROR:
ORA-12537: TNS:connection closed
 
 
Enter user-name: </code>

检查监听正常，oracle服务也是正常启动的，但是登录不进去

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[[email protected] admin]$ tnsping PD236
 
TNS Ping Utility for Linux: Version 11.2.0.1.0 - Production on 23-NOV-2015 14:17:22
 
Copyright (c) 1997, 2009, Oracle.  All rights reserved.
 
Used parameter files:
 
 
Used TNSNAMES adapter to resolve the alias
Attempting to contact (DESCRIPTION = (ADDRESS_LIST = (ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.180.236)(PORT = 1521))) (CONNECT_DATA = (SERVICE_NAME = powerdes)))
OK (10 msec)
[[email protected] admin]$

PS：原blog地址：https://blog.csdn.net/mchdba/article/category/3254519，未经过原csdn的博主mchdba允许，谢绝转载

2，解决方案

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[[email protected] bin]$ cd $ORACLE_HOME/bin/
[[email protected] bin]$
[[email protected] bin]$
[[email protected] bin]$ ll oracle
-rwsr-s--x. 1 oracle oinstall 210823844 Jul 31 13:21 oracle
[[email protected] bin]$
[[email protected] bin]$ chmod 6571 oracle
[[email protected] bin]$
[[email protected] bin]$ ll oracle
-r-srws--x. 1 oracle oinstall 210823844 Jul 31 13:21 oracle
[[email protected] bin]$
 
 
 
[[email protected] bin]$ rlwrap sqlplus / as sysdba
 
SQL*Plus: Release 11.2.0.1.0 Production on Mon Nov 23 14:20:09 2015
 
Copyright (c) 1982, 2009, Oracle.  All rights reserved.
 
 
Connected to:
Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options
 
SQL>
SQL>

ok可以连接上了，问题初步解决

3，不过3分钟后，又不行了，登录不上去。

SQL*Plus: Release 11.2.0.1.0 Production on Mon Nov 23 14:29:17 2015

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

ERROR:
ORA-12537: TNS:connection closed

Enter user-name:

去查看lsnrctl状态：
[[email protected] bin]$ lsnrctl status

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LSNRCTL for Linux: Version 11.2.0.1.0 - Production on 23-NOV-2015 14:30:33
 
Copyright (c) 1991, 2009, Oracle.  All rights reserved.
 
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=192.168.180.236)(PORT=1521)))
STATUS of the LISTENER
------------------------
Alias                     LISTENER
Version                   TNSLSNR for Linux: Version 11.2.0.1.0 - Production
Start Date                23-NOV-2015 14:30:19
Uptime                    0 days 0 hr. 0 min. 13 sec
Trace Level               off
Security                  ON: Local OS Authentication
SNMP                      OFF
Listener Parameter File   /oracle/app/oracle/product/11.2.0/dbhome_1/network/admin/listener.ora
Listener Log File         /oracle/app/oracle/diag/tnslsnr/pldb236/listener/alert/log.xml
Listening Endpoints Summary...
  (DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=192.168.180.236)(PORT=1521)))
  (DESCRIPTION=(ADDRESS=(PROTOCOL=ipc)(KEY=EXTPROC0)))
Services Summary...
Service "PLSExtProc" has 1 instance(s).
  Instance "PLSExtProc", status UNKNOWN, has 1 handler(s) for this service...
Service "powerdes" has 1 instance(s).
  Instance "powerdes", status UNKNOWN, has 1 handler(s) for this service...
The command completed successfully
[[email protected] bin]$

看到后台alert的日志报错如下：

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<code class=" hljs livecodeserver">        Mon Nov 23 14:32:00 2015
        ORA-00020: maximum number of processes 150 exceeded
        ORA-20 errors will not be written to the alert log for
         the next minute. Please look at trace files to see all
         the ORA-20 errors.
        Mon Nov 23 14:32:47 2015
        Process m000 submission failed with error = 20
        Mon Nov 23 14:33:02 2015
        ORA-00020: maximum number of processes 150 exceeded
        ORA-20 errors will not be written to the alert log for
         the next minute. Please look at trace files to see all
         the ORA-20 errors.
        Mon Nov 23 14:34:03 2015
        ORA-00020: maximum number of processes 150 exceeded
        ORA-20 errors will not be written to the alert log for
         the next minute. Please look at trace files to see all
         the ORA-20 errors.</code>

解决方案1：
lsnrctl stop 5分钟后，再lsnrctl start起来，问题解决了，是应用程序一直不停的连接数据库，占满了连接池导致的。

解决方案2：
查看oracle的连接数，果然为150

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<code class=" hljs vhdl">SQL> show parameter processes;
 
NAME                     TYPE    VALUE
------------------------------------ ----------- ------------------------------
aq_tm_processes              integer     0
db_writer_processes          integer     2
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>
SQL>
SQL> </code>

分析原因：

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<code class=" hljs asciidoc">SQL> select count(1) from v$session t where t.status=‘INACTIVE‘ and t.username=‘PLAS‘;
  COUNT(1)
----------
        88
 
SQL>
SQL>
SQL> select count(1) from v$session t where t.status=‘INACTIVE‘ and t.username=‘PLAS‘;
  COUNT(1)
----------
         5
 
SQL> </code>

修改配置文件：

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<code class=" hljs ruby">[[email protected] ~]$ find /oracle -name *init.ora*
/oracle/app/oracle/product/11.2.0/dbhome_1/dbs/init.ora
/oracle/app/oracle/product/11.2.0/dbhome_1/srvm/admin/init.ora
/oracle/app/oracle/admin/powerdes/pfile/init.ora.7112015171232
[[email protected] ~]$ </code>

改动连接数，并且写入参数文件

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<code class=" hljs oxygene">alter system set processes=500 scope = spfile;
SQL> alter system set processes=500 scope=spfile;
 
System altered.
 
SQL> create pfile from spfile;
 
File created.
 
SQL> </code>

关闭重启oracle实例，启动就可以看到最大连接数已经变成了500，问题解决

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<code class=" hljs vhdl">SQL> shutdown immediate;
Database closed.
Database dismounted.
ORACLE instance shut down.
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
[[email protected] ~]$ rlwrap sqlplus / as sysdba
 
SQL*Plus: Release 11.2.0.1.0 Production on Mon Nov 23 23:09:00 2015
 
Copyright (c) 1982, 2009, Oracle.  All rights reserved.
 
Connected to an idle instance.
 
SQL> startup;
ORACLE instance started.
 
Total System Global Area 6680915968 bytes
Fixed Size          2213936 bytes
Variable Size        4362078160 bytes
Database Buffers     2281701376 bytes
Redo Buffers           34922496 bytes
Database mounted.
Database opened.
SQL>
SQL>
SQL> show parameter processes;
 
NAME                     TYPE    VALUE
------------------------------------ ----------- ------------------------------
aq_tm_processes              integer     0
db_writer_processes          integer     2
gcs_server_processes             integer     0
global_txn_processes             integer     1
job_queue_processes          integer     1000
log_archive_max_processes        integer     4
processes                integer     500
SQL> </code>

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