数据库无法连接，alert日志持续报错

WARNING: inbound connection timed out (ORA-3136)

Tue Aug 11 07:46:53 2009

WARNING: inbound connection timed out (ORA-3136)

Tue Aug 11 08:41:41 2009

WARNING: inbound connection timed out (ORA-3136)

Tue Aug 11 08:42:06 2009

WARNING: inbound connection timed out (ORA-3136)

Tue Aug 11 08:42:38 2009

WARNING: inbound connection timed out (ORA-3136)

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处理

报错连接超时，连接服务器时确实觉得网络状况不好

修改vsqlnet.ora文件

# sqlnet.ora Network Configuration File: /ora10g/oracle/product/10.2.0/db_1/network/admin/sqlnet.ora

# Generated by Oracle configuration tools.

SQLNET.INBOUND_CONNECT_TIMEOUT = 0

将参数的值由10 修改为0，之后重启lsnrctl 就ok了

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参数解释

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.

ITPub博客

ORA-3136

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