Maybe what you want is:

sqlnet.outbound_connect_timeout

Time in seconds after which a connection attempt will be timed out. ... This parameter should typically be set to +- 3 seconds. If not set, the client connection will block for the default TCP connect timeout duration.

from http://www.orafaq.com/wiki/Sqlnet.ora, or the official documentation is here.

In reply to Re: Login/Connection timeout for DBD::Oracle? by frieduck
in thread Login/Connection timeout for DBD::Oracle? by jfroebe

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