ORA-12170: TNS:Connect timeout occurred
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今天数据库出现短暂的所有会话断开1至3分钟。
查看sqlnet.log （因为是生产环境所以我将IP都屏蔽下）
Client address: (ADDRESS=(PROTOCOL=tcp)(HOST=1.0.0.0)(PORT=33534))
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=1.0.0.0)(PORT=54370))
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=1.0.0.0)(PORT=50517))
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=1.0.0.0)(PORT=47319))
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=1.0.0.0)(PORT=54752))
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=1.0.0.0)(PORT=47366))
ns secondary err code: 12606
nt main err code: 0
nt secondary err code: 0
nt OS err code: 0
Fatal NI connect error 12170.
VERSION INFORMATION:
TNS for HPUX: Version 10.2.0.4.0 - Production
Oracle Bequeath NT Protocol Adapter for HPUX: Version 10.2.0.4.0 - Production
TCP/IP NT Protocol Adapter for HPUX: Version 10.2.0.4.0 - Production
Time: 31-JUL-2014 12:26:36
Tracing not turned on.
Tns error struct:
ns main err code: 12535
TNS-12535: TNS:operation timed out
ns secondary err code: 12560
nt main err code: 505
TNS-00505: Operation timed out
nt secondary err code: 238
nt OS err code: 0
Client address: (ADDRESS=(PROTOCOL=tcp)(HOST=1.0.0.0)(PORT=60607))
在metalink 一直纠结12606错误，也没找到什么有用的线索。最后在群里问了下伤哥，他给了我一篇他的文章http://blog.itpub.net/29477587/viewspace-1078684/
文章介绍这个错误可能是由于网络或系统延迟,或者它可能表明,在服务器上存在恶意客户机试图攻击服务器引起的。
可以尝试修改SQLNET.INBOUND_CONNECT_TIMEOUT参数
sqlnet.ora参数SQLNET.INBOUND_CONNECT_TIMEOUT
表示等待用户认证超时的时间，单位是秒，缺省值是60秒
如果用户认证超时了，服务器日志alert.log显示出错信息
WARNING: inbound connection timed out (ORA-3136)
查看bdump 中的 log
Thu Jul 31 11:06:13 2014
WARNING: inbound connection timed out (ORA-3136)
Thu Jul 31 11:06:13 2014
WARNING: inbound connection timed out (ORA-3136)
Thu Jul 31 11:06:13 2014
WARNING: inbound connection timed out (ORA-3136)
Thu Jul 31 11:06:13 2014
WARNING: inbound connection timed out (ORA-3136)
Thu Jul 31 11:06:13 2014
WARNING: inbound connection timed out (ORA-3136)
Thu Jul 31 11:06:13 2014
WARNING: inbound connection timed out (ORA-3136)
Thu Jul 31 11:06:13 2014
WARNING: inbound connection timed out (ORA-3136)
Thu Jul 31 11:06:13 2014
WARNING: inbound connection timed out (ORA-3136)
Thu Jul 31 11:06:13 2014
WARNING: inbound connection timed out (ORA-3136)
Thu Jul 31 11:06:13 2014
WARNING: inbound connection timed out (ORA-3136)
Thu Jul 31 11:06:13 2014
WARNING: inbound connection timed out (ORA-3136)
Thu Jul 31 11:06:13 2014
WARNING: inbound connection timed out (ORA-3136)
Thu Jul 31 11:06:13 2014
WARNING: inbound connection timed out (ORA-3136)
Thu Jul 31 11:06:13 2014
WARNING: inbound connection timed out (ORA-3136)
Thu Jul 31 11:06:13 2014
WARNING: inbound connection timed out (ORA-3136)
Thu Jul 31 11:06:13 2014
WARNING: inbound connection timed out (ORA-3136)
Thu Jul 31 11:06:13 2014
WARNING: inbound connection timed out (ORA-3136)
Thu Jul 31 11:06:13 2014
WARNING: inbound connection timed out (ORA-3136)
Thu Jul 31 11:06:13 2014
WARNING: inbound connection timed out (ORA-3136)
Thu Jul 31 11:06:13 2014
WARNING: inbound connection timed out (ORA-3136)
Thu Jul 31 11:06:13 2014
WARNING: inbound connection timed out (ORA-3136)
Thu Jul 31 11:06:13 2014
WARNING: inbound connection timed out (ORA-3136)
Thu Jul 31 11:06:13 2014
WARNING: inbound connection timed out (ORA-3136)
Thu Jul 31 11:06:13 2014
WARNING: inbound connection timed out (ORA-3136)
Thu Jul 31 11:06:13 2014
WARNING: inbound connection timed out (ORA-3136)
OK，果然是超时的原因。
解决方法：
修改sqlnet.ora文件中的参数SQLNET.INBOUND_CONNECT_TIMEOUT
编辑$ORACLE_HOME/network/admin/sqlnet.ora
SQLNET.INBOUND_CONNECT_TIMEOUT=0