Oracle认证辅导:Oracle10gR2ORA-3136错误解决

会计考友

　最近一台新上线的Oracle10gR2数据库在警告日志文件中(alert.log)持续出现如下错误:Tue Jul 18 23:09:22 2006
6 P: L5 [8 M  SWARNING: inbound connection timed out (ORA-3136)
8 A, r( B3 |) M" ]# xTue Jul 18 23:09:23 2006
WARNING: inbound connection timed out (ORA-3136)
5 Z- c4 \% L; a0 z# y5 LTue Jul 18 23:09:25 2006
WARNING: inbound connection timed out (ORA-3136)
0 ]( }/ r) K- [+ N: }Tue Jul 18 23:09:30 2006
! u/ o5 }9 E% V7 Q: U. m5 R* P& @9 ^WARNING: inbound connection timed out (ORA-3136)
8 w2 P5 z7 R% b  ]) TTue Jul 18 23:12:15 2006
WARNING: inbound connection timed out (ORA-3136)
) m& s& W$ e' H0 ]$ v+ H$ n　　同时在sqlnet.log中记录了如下错误:
Fatal NI connect error 12170.
VERSION INFORMATION:
TNS for Linux: Version 10.2.0.2.0 - Production
Oracle Bequeath NT Protocol Adapter for Linux: Version 10.2.0.2.0 - Production
7 l% G% R8 }  jTCP/IP NT Protocol Adapter for Linux: Version 10.2.0.2.0 - Production
. c$ Y( y! u9 b, ?" }) r+ @( iTime: 19-JUL-2006 11:25:26
9 Z: v+ A, n! t8 E) n+ YTracing not turned on.
Tns error struct:
+ n: m; `+ Z7 X0 T4 h4 Uns main err code: 12535
TNS-12535: TNS:operation timed out
ns secondary err code: 12606
nt main err code: 0
+ k  y/ T4 _# N! d, Ont secondary err code: 0
7 `4 G. Y) ]6 D3 Z; H, cnt OS err code: 0
; b8 P: O0 S. \7 S3 V% V9 G/ Z7 EClient address: (ADDRESS=(PROTOCOL=tcp)(HOST=192.168.1.123)(PORT=58147))

　　这是和网络连接相关的一个错误,Metalink上给出了如下的解决方案:
! f7 |0 s. E* H* S5 Z　　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
4 `5 i3 |1 e# z　　这里重起数据库和Listener我认为是没有必要的,我们reload一下Listner应该就可以了.
8 z' t  ~) Z0 q9 K0 U[oracle@order admin]$ lsnrctl
" h: N% f6 g. g8 wLSNRCTL for Linux: Version 10.2.0.2.0 - Production on 19-JUL-2006 15:26:33
Copyright (c) 1991, 2005, Oracle. All rights reserved.
8 w" p; l0 ?' k1 i' \! U, j2 XWelcome to LSNRCTL, type "help" for information.
LSNRCTL> reload
+ |: X3 C9 }0 d! h% n/ DConnecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=172.16.9.11)(PORT=1521)))
The command completed successfully
% _" F* U/ w. v7 U' y) t/ E; }LSNRCTL> services
; R0 j5 t- F' J7 Z5 M& H1 x7 gConnecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=172.16.9.11)(PORT=1521)))
1 F, m6 O1 s& @) @Services Summary...
Service "order" has 2 instance(s).
Instance "order", status UNKNOWN, has 1 handler(s) for this service...
Handler(s):
"DEDICATED" established:0 refused:0
  S7 `+ G1 m2 H; m! g" L4 VLOCAL SERVER
' M. q0 H- Y( x$ c  lInstance "order", status READY, has 1 handler(s) for this service...
2 _; }5 |  w; ?+ W+ I5 `Handler(s):
9 [1 D& Y  M/ X  ]8 v# B3 p8 Q  D. F"DEDICATED" established:0 refused:0 state:ready
LOCAL SERVER
The command completed successfully
LSNRCTL> show inbound_connect_timeout
. X9 F: C! d  G# C, aConnecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=172.16.9.11)(PORT=1521)))
LISTENER parameter "inbound_connect_timeout" set to 0
+ f( Y* K: c) S; D3 ?+ I) T+ MThe command completed successfully
LSNRCTL> exit


　　修改之后,观察了一段时间,目前正常.
6 [! f1 S9 D- A7 P/ ]- Y; ^! F6 E　　关于SQLNET.INBOUND_CONNECT_TIMEOUT参数,Oracle建议修改该参数,以避免denial-of-service攻击.
　　引用一段Oracle文档说明如下:
　　SQLNET.INBOUND_CONNECT_TIMEOUT
3 D+ m  e$ X* h" c) P% s* ]　　Purpose
　　Use the SQLNET.INBOUND_CONNECT_TIMEOUT parameter to specify the time, in seconds, for a client to connect with the database server and provide the necessary authentication information.
& o. W" X6 ]) c& S- N% J" I+ b　　If the client fails to establish a connection and complete authentication in the time specified, then the database server terminates the connection. In addition, the database server logs the IP address of the client and an ORA-12170: TNS:Connect timeout occurred error message to the sqlnet.log file. The client receives either an ORA-12547: TNS:lost contact or an ORA-12637: Packet receive failed error message.
　　Without this parameter, a client connection to the database server can stay open indefinitely without authentication. Connections without authentication can introduce possible denial-of-service attacks, whereby malicious clients attempt to flood database servers with connect requests that consume resources.
　　To protect both the database server and the listener, Oracle Corporation recommends setting this parameter in combination with the INBOUND_CONNECT_TIMEOUT_listener_name parameter in the listener.ora file. When specifying values for these parameters, consider the following recommendations:
; A, I* M0 J. P1 J8 S　　Set both parameters to an initial low value.
　　Set the value of the INBOUND_CONNECT_TIMEOUT_listener_name parameter to a lower value than the SQLNET.INBOUND_CONNECT_TIMEOUT parameter.

会计考友

　　For example, you can set INBOUND_CONNECT_TIMEOUT_listener_name to 2 seconds and INBOUND_CONNECT_TIMEOUT parameter to 3 seconds. If clients are unable to complete connections within the specified time due to system or network delays that are normal for the particular environment, then increment the time as needed.
( m6 Z& i: ^( u  g! Q　　See Also:
$ d) G- S# l* m% [- p6 l  |　　Oracle9i Net Services Administrator's Guide for information about configuring these parameters
8 z+ W! h& n3 f' P+ \1 S1 t/ h　　Default
: Z' W. l2 f) Q  J　　None
　　Example
2 v2 {# G8 B2 c* [1 m　　SQLNET.INBOUND_CONNECT_TIMEOUT=3</p>