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深蓝的blog：http://blog.csdn.net/huangyanlong/article/details/46372849
查看数据库告警日志，发现错误：Fatal NI connect error 12170报错
告警日志例如以下：
***********************************************************************
Fatal NI connect error 12170.
VERSION INFORMATION:
TNS for Linux: Version 11.2.0.1.0 - Production
Oracle Bequeath NT Protocol Adapter for Linux: Version 11.2.0.1.0 - Production
TCP/IP NT Protocol Adapter for Linux: Version 11.2.0.1.0 - Production
Time: 26-OCT-2014 06:05:44
Tracing not turned on.
Tns error struct:
ns main err code: 12535
VERSION INFORMATION:
TNS for Linux: Version 11.2.0.1.0 - Production
Oracle Bequeath NT Protocol Adapter for Linux: Version 11.2.0.1.0 - Production
TCP/IP NT Protocol Adapter for Linux: Version 11.2.0.1.0 - Production
Time: 26-OCT-2014 06:05:44
Tracing not turned on.
Tns error struct:
ns main err code: 12535
TNS-12535: TNS:operation timed out
ns secondary err code: 12606
nt main err code: 0
nt secondary err code: 0
nt OS err code: 0
Client address: (ADDRESS=(PROTOCOL=tcp)(HOST=10.53.105.20)(PORT=19164))
VERSION INFORMATION:
TNS for Linux: Version 11.2.0.1.0 - Production
Oracle Bequeath NT Protocol Adapter for Linux: Version 11.2.0.1.0 - Production
TCP/IP NT Protocol Adapter for Linux: Version 11.2.0.1.0 - Production
Time: 26-OCT-2014 06:05:44
Tracing not turned on.
Tns error struct:
ns main err code: 12535
TNS-12535: TNS:operation timed out
ns secondary err code: 12606
nt main err code: 0
nt secondary err code: 0
nt OS err code: 0
Client address: (ADDRESS=(PROTOCOL=tcp)(HOST=10.53.105.20)(PORT=19166))
TNS-12535: TNS:operation timed out
ns secondary err code: 12606
nt main err code: 0
nt secondary err code: 0
nt OS err code: 0
Client address: (ADDRESS=(PROTOCOL=tcp)(HOST=10.53.105.20)(PORT=19165))
Sun Oct 26 06:05:50 2014
Successfully onlined Undo Tablespace 2.
Verifying file header compatibility for 11g tablespace encryption..
Verifying 11g file header compatibility for tablespace encryption completed
***********************************************************************
【解决方案】
[oracle@node1 ~]$ lsnrctl status
LSNRCTL for Linux: Version 11.2.0.1.0 - Production on 02-MAR-2015 12:34:22
Copyright (c) 1991, 2009, Oracle. All rights reserved.
Connecting to (ADDRESS=(PROTOCOL=tcp)(HOST=)(PORT=1521))
STATUS of the LISTENER
------------------------
Alias LISTENER
Version TNSLSNR for Linux: Version 11.2.0.1.0 - Production
Start Date 02-MAR-2015 09:45:49
Uptime 0 days 2 hr. 48 min. 33 sec
Trace Level off
Security ON: Local OS Authentication
SNMP OFF
Listener Parameter File /u01/11.2.0/grid/network/admin/listener.ora
Listener Log File /u01/app/oracle/diag/tnslsnr/node1/listener/alert/log.xml
Listening Endpoints Summary...
(DESCRIPTION=(ADDRESS=(PROTOCOL=ipc)(KEY=LISTENER)))
(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=10.53.105.20)(PORT=1521)))
(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=10.53.105.24)(PORT=1521)))
Services Summary...
Service "+ASM" has 1 instance(s).
Instance "+ASM1", status READY, has 1 handler(s) for this service...
Service "xcky" has 1 instance(s).
Instance "xcky1", status READY, has 1 handler(s) for this service...
Service "xckyXDB" has 1 instance(s).
Instance "xcky1", status READY, has 1 handler(s) for this service...
The command completed successfully
[oracle@node1 ~]$ cd /u01/11.2.0/grid/network/admin/
[oracle@node1 admin]$ ls
endpoints_listener.ora listener.ora samples sqlnet.ora
listener1410255PM1539.bak listener.ora.bak.node1 shrept.lst
[root@node1 admin]# chmod 775 listener.ora
[root@node1 admin]# chmod 775 sqlnet.ora
--确认oracle用户对配置文件的訪问权限
[oracle@node1 admin]$ vi listener.ora
--加入參数INBOUND_CONNECT_TIMEOUT_LISTENER = 0
--加入參数DIAG_ADR_ENABLED_LISTENER = OFF
LISTENER=(DESCRIPTION=(ADDRESS_LIST=(ADDRESS=(PROTOCOL=IPC)(KEY=LISTENER)))) # line added by Agent
LISTENER_SCAN1=(DESCRIPTION=(ADDRESS_LIST=(ADDRESS=(PROTOCOL=IPC)(KEY=LISTENER_SCAN1)))) # line added by Agent
ENABLE_GLOBAL_DYNAMIC_ENDPOINT_LISTENER_SCAN1=ON # line added by Agent
ENABLE_GLOBAL_DYNAMIC_ENDPOINT_LISTENER=ON # line added by Agent
INBOUND_CONNECT_TIMEOUT_LISTENER = 0
DIAG_ADR_ENABLED_LISTENER = OFF
~
~
[oracle@node1 admin]$ vi sqlnet.ora
--加入參数DIAG_ADR_ENABLED = OFF
--加入參数SQLNET.INBOUND_CONNECT_TIMEOUT =0
# sqlnet.ora.node1 Network Configuration File: /u01/11.2.0/grid/network/admin/sqlnet.ora.node1
# Generated by Oracle configuration tools.
NAMES.DIRECTORY_PATH= (TNSNAMES, EZCONNECT)
ADR_BASE = /u01/app/oracle
DIAG_ADR_ENABLED = OFF
SQLNET.INBOUND_CONNECT_TIMEOUT =0
~
~
【官方文档】
来看一下官方文档中的说明，例如以下：
ORA-12170: TNS:Connect timeout occurred
Cause: The client failed to establish a connection and complete authentication in the time specified by the SQLNET.INBOUND_CONNECT_TIMEOUT parameter in the sqlnet.ora file. This error may be a result of network or system delays, or it may indicate that a malicious client is trying to cause a denial-of-service attack on the database server.
See Also:
"Configuring the Listener and the Oracle Database To Limit Resource Consumption By Unauthorized Users" further information about setting the SQLNET.INBOUND_CONNECT_TIMEOUT parameter
Action: If the error occurred due to system or network delays that are normal for the particular environment, then perform these steps:
Turn on tracing to determine where clients are timing out.
See Also:
"Tracing Error Information for Oracle Net Services"
Reconfigure the SQLNET.INBOUND_CONNECT_TIMEOUT parameter in sqlnet.ora to a larger value.
If you suspect a malicious client, then perform these steps:
Locate the IP address of the client in the sqlnet.log file on the database server to identify the source.
For example, the following sqlnet.log excerpt shows a client IP address of 10.10.150.35.
Fatal NI connect error 12170.
VERSION INFORMATION:
TNS for Solaris: Version 10.1.0.2.0
Oracle Bequeath NT Protocol Adapter for Solaris: Version 10.1.0.2.0
TCP/IP NT Protocol Adapter for Solaris: Version 10.1.0.2.0
Time: 03-JUL-2002 13:51:12
Tracing to file: /ora/trace/svr_13279.trc
Tns error struct:
nr err code: 0
ns main err code: 12637
TNS-12637: Packet receive failed
ns secondary err code: 12604
nt main err code: 0
nt secondary err code: 0
nt OS err code: 0
Client address: (ADDRESS=(PROTOCOL=tcp)(HOST=10.10.150.35)(PORT=52996))
Beware that an IP address can be forged.
If the time out occurs before the IP address can be retrieved by the database server, then enable listener tracing to determine the client that made the request.
See Also:
Tracing Error Information for Oracle Net Services
Restrict access to the client. For example, you can configure parameters for access rights in the sqlnet.ora file.
See Also:
"Configuring Database Access Control"
【过程梳理】
上面是10G的官方文档内容，能够看到官方文档，给出了一个建议：Reconfigure the SQLNET.INBOUND_CONNECT_TIMEOUT parameter in sqlnet.ora to a larger value.
再找找官方文档对于SQLNET.INBOUND_CONNECT_TIMEOUT的说明。例如以下图：
如上。这个问题的出现是因为数据库连接没能成功完毕。在连接结果来看出现了延迟造成的。在官方文档中并没有找到明白的处理方式，仅仅是一些配置建议。
兴许在网上搜了搜同类的错误处理方式（有资料说这个错误能够再MOS文档中找到），再结合官方文档，初步了解到对于ORA-12170错误，因为在Automatic Diagnostic Repository中的 Oracle Net diagnostic是开启状态，从而对连接延迟错误进行获取而且将其写入告警日志。
网友贴出来的MOS文档參考。例如以下：
To revert to Oracle Net Server tracing/logging, set following parameter in the server's sqlnet.ora :
DIAG_ADR_ENABLED = OFF
Also, to back out the ADR diag for the Listener component, set following parameter in the server's listener.ora:
DIAG_ADR_ENABLED_
- Where the
DIAG_ADR_ENABLED_LISTENER = OFF
-Reload or restart the TNS Listener for the parameter change to take effect.
网友贴出的Metalink上给出的解决方式
1. set INBOUND_CONNECT_TIMEOUT_=0 in listener.ora
2. set SQLNET.INBOUND_CONNECT_TIMEOUT = 0 in sqlnet.ora of server.
3. stop and start both listener and database.
4. Now try to connect to DB and observe the behaviour
*******************************************蓝的成长记系列_20150523*************************************
原创作品，出自 “深蓝的blog” 博客，欢迎转载，转载时请务必注明出处（http://blog.csdn.net/huangyanlong）。
蓝的成长记——追逐DBA（1）：奔波于路上，挺进山东
蓝的成长记——追逐DBA（2）：安装！
安装！久违的记忆，引起我对DBA的又一次认知
蓝的成长记——追逐DBA（3）：古董上操作，数据导入导出成了问题
蓝的成长记——追逐DBA（4）：追忆少年情愁。再探oracle安装（Linux下10g、11g）
蓝的成长记——追逐DBA（5）：不谈技术谈业务。恼人的应用系统
蓝的成长记——追逐DBA（6）： 做事与做人：小技术，大为人
蓝的成长记——追逐DBA（7）：基础命令，地基之石
蓝的成长记——追逐DBA（8）：重拾SP报告，回顾oracle的STATSPACK实验
蓝的成长记——追逐DBA（9）：国庆渐去，追逐DBA，新规划，新启程
蓝的成长记——追逐DBA（10）：飞刀防身。熟络而非专长：摆弄中间件Websphere
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蓝的成长记——追逐DBA（15）：以为FTP非常“简单”，谁成想一波三折
蓝的成长记——追逐DBA（16）：DBA也喝酒。被捭阖了
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********************************************足球与oracle系列_20150528***********************************
原创作品。出自 “深蓝的blog” 博客，欢迎转载。转载时请务必注明出处（http://blog.csdn.net/huangyanlong）。
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