故障现象：
数据库监听不定期出现异常 ,从应用tnsping数据库，时间花费很长甚至连不上
故障分析处理过程：
从应用主机tnsping如下：
racdb1_scenemon$tnsping racdb_new
TNS Ping Utility for Solaris: Version 11.2.0.3.0 - Production on 19-2月 -2014 15:46:23
Copyright (c) 1997, 2011, Oracle. All rights reserved.
已使用的参数文件:
已使用 TNSNAMES 适配器来解析别名
尝试连接 (DESCRIPTION = (ADDRESS = (PROTOCOL = TCP)(HOST = 11.111.11.1)(PORT = 1521)) (ADDRESS = (PROTOCOL = TCP)(HOST = 11.111.11.2)(PORT = 1521)) (LOAD_BALANCE = yes) (CONNECT_DATA = (SERVER = DEDICATED) (SERVICE_NAME = racdb) (FAILOVER_MODE = (TYPE = SELECT) (METHOD = BASIC) (RETRIES = 180) (DELAY = 5))))
OK (60000 毫秒)
从数据库服务器上查看监听状态：
$ lsnrctl status
LSNRCTL for Solaris: Version 11.2.0.3.0 - Production on 19-FEB-2014 15:45:58
Copyright (c) 1991, 2011, Oracle. All rights reserved.
Connecting to (ADDRESS=(PROTOCOL=tcp)(HOST=)(PORT=1521))
TNS-12535: TNS:operation timed out
TNS-12560: TNS:protocol adapter error
TNS-00505: Operation timed out
将监听进程予以kill并重启监听：
$ ps -ef |grep tns
oracle 18504 18468 0 15:45:15 pts/10 0:00 grep tns
oracle 24037 1 0 Nov 28 6:08 /oracle/app/asm/11.2.0/grid/bin/tnslsnr LISTENER -inherit
oracle 9488 1 3 Jan 24 4447:11 /oracle/app/db/product/11.2.0/db/bin/tnslsnr LISTENER -inherit
$
$ kill -9 9488
$ lsnrctl start
LSNRCTL for Solaris: Version 11.2.0.3.0 - Production on 19-FEB-2014 15:48:22
Copyright (c) 1991, 2011, Oracle. All rights reserved.
Starting /oracle/app/db/product/11.2.0/db/bin/tnslsnr: please wait...
TNSLSNR for Solaris: Version 11.2.0.3.0 - Production
Log messages written to /oracle/app/db/product/11.2.0/db/log/diag/tnslsnr/racdb/listener/alert/log.xml
Listening on: (DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=racdb)(PORT=1521)))
Connecting to (ADDRESS=(PROTOCOL=tcp)(HOST=)(PORT=1521))
STATUS of the LISTENER
------------------------
Alias LISTENER
Version TNSLSNR for Solaris: Version 11.2.0.3.0 - Production
Start Date 19-FEB-2014 15:48:22
Uptime 0 days 0 hr. 0 min. 0 sec
Trace Level off
Security ON: Local OS Authentication
SNMP OFF
Listener Log File /oracle/app/db/product/11.2.0/db/log/diag/tnslsnr/racdb/listener/alert/log.xml
Listening Endpoints Summary...
(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=racdb)(PORT=1521)))
The listener supports no services
The command completed successfully
检查listener.log如下：
17-FEB-2014 16:02:26 * (CONNECT_DATA=(SERVER=DEDICATED)(SERVICE_NAME=racdb)(FAILOVER_MODE=(TYPE=SELECT)(METHOD=BASIC)(RETRIES=180)(DELAY=5))(CID=(PROGRAM=sqlplus@racdb1)(HOST=racdb1)(USER=tmn))) * (ADDRESS=(PROTOCOL=tcp)(HOST=11.111.11.89)(PORT=41603)) * establish * racdb * 0
17-FEB-2014 16:02:26 * (CONNECT_DATA=(SERVER=DEDICATED)(SERVICE_NAME=racdb)(FAILOVER_MODE=(TYPE=SELECT)(METHOD=BASIC)(RETRIES=180)(DELAY=5))(CID=(PROGRAM=sqlplus@racdb1)(HOST=racdb1)(USER=tmn))) * (ADDRESS=(PROTOCOL=tcp)(HOST=11.111.11.89)(PORT=41659)) * establish * racdb * 12518
TNS-12518: TNS:listener could not hand off client connection
TNS-12560: TNS:protocol adapter error
TNS-00530: Protocol adapter error
Solaris Error: 24: Too many open files <<<<<<<<<
17-FEB-2014 16:02:26 * (CONNECT_DATA=(SERVER=DEDICATED)(SERVICE_NAME=racdb)(FAILOVER_MODE=(TYPE=SELECT)(METHOD=BASIC)(RETRIES=180)(DELAY=5))(CID=(PROGRAM=sqlplus@racdb1)(HOST=racdb1)(USER=tmn))) * (ADDRESS=(PROTOCOL=tcp)(HOST=11.111.11.89)(PORT=41652)) * establish * racdb * 0
17-FEB-2014