Oracle10gR2 ORA-3136 錯誤解決

2024-08-29 13:34:40

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最近一臺新上線的Oracle10gR2數據庫在警告日志文件中(alert.log)持續出現如下錯誤:Tue Jul 18 23:09:22 2006
WARNING: inbound connection timed out (ORA-3136)
Tue Jul 18 23:09:23 2006
WARNING: inbound connection timed out (ORA-3136)
Tue Jul 18 23:09:25 2006
WARNING: inbound connection timed out (ORA-3136)
Tue Jul 18 23:09:30 2006
WARNING: inbound connection timed out (ORA-3136)
Tue Jul 18 23:12:15 2006
WARNING: inbound connection timed out (ORA-3136)同時在sqlnet.log中記錄了如下錯誤: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
TCP/ip NT Protocol Adapter for Linux: Version 10.2.0.2.0 - Production
Time: 19-JUL-2006 11:25:26
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=192.168.1.123)(PORT=58147))這是和網絡連接相關的一個錯誤,Metalink上給出了如下的解決方案:

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

這里重起數據庫和Listener我認為是沒有必要的,我們reload一下Listner應該就可以了.[oracle@order admin]$ lsnrctl LSNRCTL for Linux: Version 10.2.0.2.0 - Production on 19-JUL-2006 15:26:33Copyright (c) 1991, 2005, Oracle. All rights reserved.Welcome to LSNRCTL, type "help" for information.LSNRCTL> reload
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=172.16.9.11)(PORT=1521)))
The command completed successfully
LSNRCTL> services
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=172.16.9.11)(PORT=1521)))
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
LOCAL SERVER
Instance "order", status READY, has 1 handler(s) for this service...
Handler(s):
"DEDICATED" established:0 refused:0 state:ready
LOCAL SERVER
The command completed successfully LSNRCTL> show inbound_connect_timeout
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=172.16.9.11)(PORT=1521)))
LISTENER parameter "inbound_connect_timeout" set to 0
The command completed successfully
LSNRCTL> exit
修改之后,觀察了一段時間,目前正常.關于SQLNET.INBOUND_CONNECT_TIMEOUT參數,Oracle建議修改該參數,以避免denial-of-service攻擊.引用一段Oracle文檔說明如下:SQLNET.INBOUND_CONNECT_TIMEOUT
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.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: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.
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.See Also:
Oracle9i Net Services Administrator's Guide for information about configuring these parameters Default
NoneExample
SQLNET.INBOUND_CONNECT_TIMEOUT=3

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