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">[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: </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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[oracle@pldb236 admin]$ tnsping PD236TNS Ping Utility for Linux: Version 11.2.0.1.0 - Production on 23-NOV-2015 14:17:22Copyright (c) 1997, 2009, Oracle. All rights reserved.Used parameter files:Used TNSNAMES adapter to resolve the aliasAttempting to contact (DESCRIPTION = (ADDRESS_LIST = (ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.180.236)(PORT = 1521))) (CONNECT_DATA = (SERVICE_NAME = powerdes)))OK (10 msec)[oracle@pldb236 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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[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> |
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：
[oracle@pldb236 bin]$ lsnrctl status
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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]$ |
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 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> </code> |
分析原因：
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<code class=" hljs asciidoc">SQL> select count(1) from v$session t where t.status=‘INACTIVE‘ and t.username=‘PLAS‘; COUNT(1)---------- 88SQL> SQL> SQL> select count(1) from v$session t where t.status=‘INACTIVE‘ and t.username=‘PLAS‘; COUNT(1)---------- 5SQL> </code> |
修改配置文件：
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<code class=" hljs ruby">[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 ~]$ </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> 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> </code> |
