ORA-12537: TNS:connection closed连接关闭，Oracle报错处理

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1. 报错信息ORA-12537: TNS:connection closed连接关闭

[oracle@pldb236 admin]$ rlwrap sqlplus powerdesk/pd141118@PD236SQL*Plus: Release 11.2.0.1.0 Production on Mon Nov 23 14:16:31 2015Copyright (c) 1982, 2009, Oracle.  All rights reserved.ERROR:ORA-12537: TNS:connection closedEnter user-name:

检查监听正常，oracle服务也是正常启动的，但是登录不进去。

[oracle@jcapp ~]$ tnsping PD236TNS Ping Utility for Linux: Version 11.2.0.1.0 - Production on 05-DEC-2017 16:57:47Copyright (c) 1997, 2009, Oracle.  All rights reserved.Used parameter files:/opt/app/oracle/product/11.2.0/dbhome_1/network/admin/sqlnet.oraTNS-03505: Failed to resolve name[oracle@jcapp ~]$

2.解决方案

[oracle@pldb236 bin]$ cd $ORACLE_HOME/bin/[oracle@pldb236 bin]$ [oracle@pldb236 bin]$ [oracle@pldb236 bin]$ ll oracle-rwsr-s--x. 1 oracle oinstall 210823844 Jul 31 13:21 oracle[oracle@pldb236 bin]$ [oracle@pldb236 bin]$ chmod 6571 oracle[oracle@pldb236 bin]$ [oracle@pldb236 bin]$ ll oracle-r-srws--x. 1 oracle oinstall 210823844 Jul 31 13:21 oracle[oracle@pldb236 bin]$ [oracle@pldb236 bin]$ rlwrap sqlplus / as sysdbaSQL*Plus: Release 11.2.0.1.0 Production on Mon Nov 23 14:20:09 2015Copyright (c) 1982, 2009, Oracle.  All rights reserved.Connected to:Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - 64bit ProductionWith the Partitioning, OLAP, Data Mining and Real Application Testing optionsSQL> SQL> 1
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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。

去查看lsnrctl状态：
[oracle@pldb236 bin]$ lsnrctl status

LSNRCTL for Linux: Version 11.2.0.1.0 - Production on 23-NOV-2015 14:30:33Copyright (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                     LISTENERVersion                   TNSLSNR for Linux: Version 11.2.0.1.0 - ProductionStart Date                23-NOV-2015 14:30:19Uptime                    0 days 0 hr. 0 min. 13 secTrace Level               offSecurity                  ON: Local OS AuthenticationSNMP                      OFFListener Parameter File   /oracle/app/oracle/product/11.2.0/dbhome_1/network/admin/listener.oraListener Log File         /oracle/app/oracle/diag/tnslsnr/pldb236/listener/alert/log.xmlListening 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[oracle@pldb236 bin]$ 1
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看到后台alert的日志报错如下：

        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.1
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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

SQL> show parameter processes;NAME                     TYPE    VALUE------------------------------------ ----------- ------------------------------aq_tm_processes              integer     0db_writer_processes          integer     2gcs_server_processes             integer     0global_txn_processes             integer     1job_queue_processes          integer     1000log_archive_max_processes        integer     4processes                integer     150SQL> SQL> SQL> 1
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分析原因：

SQL> select count(1) from v$session t where t.status='INACTIVE' and t.username='PLAS';  COUNT(1)----------        88SQL> SQL> SQL> select count(1) from v$session t where t.status='INACTIVE' and t.username='PLAS';  COUNT(1)----------         5SQL> 1
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修改配置文件：

[oracle@pldb236 ~]$ 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[oracle@pldb236 ~]$ 1
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改动连接数，并且写入参数文件

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> 1
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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

SQL> shutdown immediate;Database closed.Database dismounted.ORACLE instance shut down.SQL> exitDisconnected from Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - 64bit ProductionWith the Partitioning, OLAP, Data Mining and Real Application Testing options[oracle@pldb236 ~]$ rlwrap sqlplus / as sysdbaSQL*Plus: Release 11.2.0.1.0 Production on Mon Nov 23 23:09:00 2015Copyright (c) 1982, 2009, Oracle.  All rights reserved.Connected to an idle instance.SQL> startup;ORACLE instance started.Total System Global Area 6680915968 bytesFixed Size          2213936 bytesVariable Size        4362078160 bytesDatabase Buffers     2281701376 bytesRedo Buffers           34922496 bytesDatabase mounted.Database opened.SQL> SQL> SQL> show parameter processes;NAME                     TYPE    VALUE------------------------------------ ----------- ------------------------------aq_tm_processes              integer     0db_writer_processes          integer     2gcs_server_processes             integer     0global_txn_processes             integer     1job_queue_processes          integer     1000log_archive_max_processes        integer     4processes                integer     500SQL>

问题解决。

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