监听启动出错，报以下错误：
lsnrctl start
LSNRCTL for Linux: Version 9.2.0.4.0 - Production on 06-JUL- 14:37:59
Copyright (c) 1991, 2002, Oracle Corporation. All rights reserved.
Starting /opt/oracle/product/9ir2/bin/tnslsnr: please wait...
TNS-12547: TNS:lost contact TNS-12560: TNS:protocol adapter error TNS-00517: Lost contact Linux Error: 32: Broken pipe
数据库服务器操作系统为Red Hat AS4，属于32位操作系统，最大文本文件不能超过2G。
当$ORACLE_HOME/network/log中listener.log大小等于2G的时候，无法继续写入日志,监听服务会自动停掉，启动或停止listener时都会报错
：
数据库服务器操作系统为Red Hat AS4，属于32位操作系统，最大文本文件不能超过2G。
当$ORACLE_HOME/network/log中listener.log大小等于2G的时候，无法继续写入日志,监听服务会自动停掉，启动或停止listener时都会报错
解决办法：
1.经常手工去清除listener.log文件的内容，在数据库服务器执行以下命令
cd $ORACLE_HOME/network/log
cat </dev/null> listener.log
2、让命令lsnrctl不记录log，在数据库服务器执行以下命令
lsnrctl
set log_status off
quit
也可以在listener.ora文件中加入logging_listener=off,即可关闭监听日志
可能跟这个问题相关的第二种情况，错误信息如下:
TNS-12547: TNS:lost contact TNS-12560: TNS:protocol adapter error TNS-00517: Lost contact Linux Error: 104: Connection reset by peer
这个问题应该跟主机名有关了，查看/etc/hosts文件
[root@olivenan root]# more /etc/hosts
# Do not remove the following line, or various programs
# that require network functionality will fail.
127.0.0.1 localhost
然后查看listener.ora文件，发现HOST=ixdba
应该是这里的问题了，那么只需在/etc/hosts增加如下即可
[root@olivenan root]# more /etc/hosts
# Do not remove the following line, or various programs
# that require network functionality will fail.
127.0.0.1 localhost
127.0.0.1 ixdba
以下是另外一种情况
今天上午，遇到一个问题，客户容灾库其中一个节点启动监听报错 TNS-12547: TNS:lost contact （另外一个节点启动正常）
根据抱错，怀疑是lintener.log日志文件太大了，超过2G了，所以无法启动，还有一个可能是/etc/hosts 目录下没有 127.0.0.1 loopback localhost 记录，这是通常导致此错误的常见原因
查看lintener.log日志文件，大小远不足2G,第一种可能排除；
r2:/oracle/app/oracle/product/9.2.0/network/log>ls -lrt
total 24
drwxr-xr-x 2 oracle dba 256 Nov 15 bak
-rw-r--r-- 1 oracle dba 6414 Feb 24 15:32 sqlnet.log
-rw-r--r-- 1 oracle dba 3025 Jul 09 11:38 listener.log
查看/etc/hosts的内容：127.0.0.1 loopback localhost # loopback (lo0) name/address也正常，第二种可能排除
/etc/hosts
#
# This file contains the hostnames and their address for hosts in the
# network. This file is used to resolve a hostname into an Internet
# address.
#
# At minimum, this file must contain the name and address for each
# device defined for TCP in your /etc/net file. It may also contain
# entries for well-known (reserved) names such as timeserver
# and printserver as well as any other host name and address.
#
# The format of this file is:
# Internet Address Hostname # Comments
# Items are separated by any number of blanks and/or tabs. A '#'
# indicates the beginning of a comment; characters up to the end of the
# line are not interpreted by routines which search this file. Blank
# lines are allowed.
# Internet Address Hostname # Comments
# 192.9.200.1 net0sample # ethernet name/address
# 128.100.0.1 token0sample # token ring name/address
# 10.2.0.2 x25sample # x.25 name/address
127.0.0.1 loopback localhost # loopback (lo0) name/address
这里依旧尝试了一下，rm lintener.log，在touch一个listener.log，在启动监听
Lsnrctl stop -----先停掉listener
rm listener.log ----cd $ORACLE_HOME/network/log
touch listener.log
lsnrctl start
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=135.10.34.38)(PORT=1521)))
TNS-12547: TNS:lost contact
TNS-12560: TNS rotocol adapter error
TNS-00517: Lost contact
IBM/AIX RISC System/6000 Error: 73: Connection reset by peer
报错依旧，查看lintener.log里的记录
09-JUL- 12:17:05 * 12546
TNS-12546: TNS ermission denied
TNS-12560: TNS rotocol adapter error
TNS-00516: Permission denied
查看其进程:
r2:/oracle/app/oracle/product/9.2.0/network/admin>ps -ef |grep lsnr
oracle 192870 168578 0 12:16:13 pts/9 0:00 grep lsnr
oracle 254244 274714 0 11:06:44 pts/0 0:00 lsnrctl
oracle 242390 1 0 11:06:57 pts/0 0:00 /oracle/app/oracle/product/9.2.0/bin/tnslsnr LISTENER -inherit
rzyzdb2:/oracle/app/oracle/product/9.2.0/network/admin>
kill -9 242390
r2:/oracle/app/oracle/product/9.2.0/network/log>lsnrctl start
LSNRCTL for IBM/AIX RISC System/6000: Version 9.2.0.8.0 - Production on 09-JUL- 12:24:21
Copyright 1991, , Oracle Corporation. All rights reserved.
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=135.10.34.38)(PORT=1521)))
TNS-12537: TNS:connection closed
TNS-12560: TNS rotocol adapter error
TNS-00507: Connection closed
查看节点2的sqlnet.ora发现：
问题就在此（sqlnet.ora里面有ip限制的，38这个ip,也就是出故障的这个ip不再sqlnet.ora内容里，将38添加到sqlnet.ora后，启动正常)
