RE: SQL*Net - Connection Timeout
Date: Fri, 29 Feb 2008 16:26:26 -0700
I believe that the timeout is controlled at the TCP/IP level.
Can you look at the problematic machine and see if someone has decided to be clever an muck with the default TCP/IP settings? For example, lots of logic is based on the TcpInitialRTT parameter, which includes the warning
"This parameter controls the initial time-out used for a TCP connection request and initial data retransmission on a per-interface basis. Use caution when tuning with this parameter because exponential backoff is used. Setting this value to larger than 3 results in much longer time-outs to nonexistent addresses."
Distributed Database Consulting, Inc.
[mailto:oracle-l-bounce_at_freelists.org] On Behalf Of Moore, Paul Sent: Friday, February 29, 2008 11:16 AM To: oracle-l_at_freelists.org
Subject: SQL*Net - Connection Timeout
I have a problem with a remote database, where any attempt to connect to
that database from one particular client hangs indefinitely (more
precisely, for longer than I have been willing to wait to see if it's
actually "hours" rather than "forever" :-)) The inability to connect
from this particular client isn't a major problem, but having jobs which
attempt to connect hang indefinitely rather than fail with a TNS timeout
I have looked through the SQL*Net reference, and asked colleagues, but I cannot find any way of setting a parameter to say that the client (OCI, actually Python with cx_Oracle) connection should timeout after XXX seconds, regardless. Is there such a setting anywhere? The connection attempt is part of a long-running process, so I cannot simply kill the hung process. Running the connection in a thread and giving up waiting after a timeout sort of works, but the thread stays there, hung, and as time goes on the process accumulates hung threads. I'd really, really like to avoid having to re-engineer my process to spawn subprocesses for each connection (especially as this is on Windows where spawning subprocesses is a bit of a pain compared to using threads).
Has anyone got any suggestions?
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Received on Fri Feb 29 2008 - 17:26:26 CST