一、现状记录
[oracle@node1 ~]$
/sbin/ifconfig
eth1 Link encap:Ethernet HWaddr 00:25:90:04:AB:6B
inet addr:192.168.9.140 Bcast:192.168.15.255 Mask:255.255.248.0
inet6 addr: fe80::225:90ff:fe04:ab6b
/64
Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:23530402 errors:0 dropped:0 overruns:0 frame:0
TX packets:10959123 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:15308483748 (14.2 GiB) TX bytes:10087987532 (9.3 GiB)
--IP地址为192.168.9.140
[oracle@node1 ~]$
more
/etc/hosts
# Do not remove the following line, or various programs
# that require network functionality will fail.
127.0.0.1 ecp-db localhost.localdomain localhost
192.168.9.140 node1.srtcloud.com
--域名node1.srtcloud.com对应ip192.168.9.140
[oracle@node1 ~]$ lsnrctl status
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=node1.srtcloud.com)(PORT=1521)))
STATUS of the LISTENER
------------------------
Alias LISTENER
Version TNSLSNR
for
Linux: Version 10.2.0.5.0 - Production
Start Date 04-NOV-2011 09:08:51
Uptime 21 days 4 hr. 58 min. 45 sec
Trace Level off
Security ON: Local OS Authentication
SNMP OFF
Listener Parameter File
/opt/oracle/product/10
.2.0
/db_1/network/admin/listener
.ora
Listener Log File
/opt/oracle/product/10
.2.0
/db_1/network/log/listener
.log
Listening Endpoints Summary...
(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=node1.srtcloud.com)(PORT=1521)))
Services Summary...
Service
"ecp"
has 2 instance(s).
Instance
"ecp"
, status UNKNOWN, has 1 handler(s)
for
this service...
Instance
"ecp"
, status READY, has 1 handler(s)
for
this service...
Service
"ecpXDB"
has 1 instance(s).
Instance
"ecp"
, status READY, has 1 handler(s)
for
this service...
Service
"ecp_XPT"
has 1 instance(s).
Instance
"ecp"
, status READY, has 1 handler(s)
for
this service...
Service
"ora11g"
has 2 instance(s).
Instance
"ora11g"
, status UNKNOWN, has 1 handler(s)
for
this service...
Instance
"ora11g"
, status READY, has 1 handler(s)
for
this service...
Service
"ora11gXDB"
has 1 instance(s).
Instance
"ora11g"
, status READY, has 1 handler(s)
for
this service...
The
command
completed successfully
--说明:ora11g是oracle 11g，ecp是oracle 10g
--当前使用域名node1.srtcloud.com监听
[oracle@node1 ~]$
more
/opt/oracle/product/10
.2.0
/db_1/network/admin/tnsnames
.ora
# tnsnames.ora Network Configuration File: /opt/oracle/product/10.2.0/db_1/network/admin/tnsnames.ora
# Generated by Oracle configuration tools.
ECP =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = node1.srtcloud.com)(PORT = 1521))
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = ecp)
)
)
ORA11G =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = node1.srtcloud.com)(PORT = 1521))
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = ora11g)
)
)
--tns也通过域名访问
[oracle@node1 ~]$
more
/etc/resolv
.conf
nameserver 211.155.235.201
nameserver 211.155.235.188
--当前有效的dns服务器
[oracle@node1 ~]$
more
/etc/nsswitch
.conf |
grep
hosts:
hosts: files dns
--域名解析顺序
|
二、数据库正常工作分析
1、tns工作：客户端通过tns访问数据库，tns配置的是域名访问，所以需要解析，因为此刻解析的顺序是先利用/etc/hosts解析，所以读取hosts文件，获取到ip，然后访问对应数据库，和监听接触。
2、监听工作：监听的是域名，其实也是通过hosts解析成ip的
3、这里能够正常的工作，是因为hosts文件解析了域名
三、模拟数据库访问延迟
[oracle@node1 ~]$
more
/etc/nsswitch
.conf |
grep
hosts:
hosts: dns files
--先使用dns服务器解析，再使用hosts文件
[oracle@node1 ~]$
more
/etc/resolv
.conf
nameserver 11.1.1.1
--无效的dns服务器
[oracle@node1 ~]$ sqlplus chf
/xifenfei
@ora11g
SQL*Plus: Release 10.2.0.5.0 - Production on Fri Nov 25 14:44:55 2011
Copyright (c) 1982, 2010, Oracle. All Rights Reserved.
--会在这里一个很长的时间等待
[oracle@node1 ~]$ lsnrctl status
LSNRCTL
for
Linux: Version 10.2.0.5.0 - Production on 25-NOV-2011 14:48:26
Copyright (c) 1991, 2010, Oracle. All rights reserved.
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=node1.srtcloud.com)(PORT=1521)))
--也会一个长时间的等待
--问题原因:就是因为解析域名的时候，先去访问dns服务器，因为该ip非dns服务器ip，所以会一直等待该ip超时，
--然后访问hosts文件获取ip地址（这个就是为什么我们登录或者查看监听状态的时候，会出现如此长的时间的等待）
|
其实因为dns延迟的现象有很多种，我这里只是举了一个最简单，比较常见的例子，在处理因dns解析的监听延迟的问题上，可以参考下面几点:
1、如果非特殊情况，尽可能使用ip地址在监听和tns中
2、如果是使用域名，请尽可能使用hosts解析，解析顺序配置为files优先（因为dns服务器有很多不确定，不可控因素）
3、如果一定要使用dns服务器解析，请把稳定的dns服务器配置在第一项，尽可能避免出现dns服务器不可达或者不存在该域名的现象
转：http://www.xifenfei.com/2011/11/%e5%9b%a0%e5%9f%9f%e5%90%8d%e8%a7%a3%e6%9e%90%e5%af%bc%e8%87%b4%e6%95%b0%e6%8d%ae%e5%ba%93%e8%bf%9e%e6%8e%a5%e5%bb%b6%e8%bf%9f%e5%88%86%e6%9e%90.html
文章可以转载，必须以链接形式标明出处。
本文转自 张冲andy 博客园博客，原文链接： http://www.cnblogs.com/andy6/p/5759257.html
，如需转载请自行联系原作者
