A segfault is a rather extreme error, try below in a step by step manner to try isolating where/what is causing it.

Specifically:

• I'll assume you're using use strict and -w :).
• You're using double quotes around the dbi:ODBC:datasource where you should be using single quotes. Double quotes interpolate, single don't.
• Next you could add some more error handling $sth = $dbh->prepare("SELECT * FROM table") or die "error message here" and other locations to help track it down (and strictly speaking prepare isn't needing for a query like this but that's a non-issue).

In General:

• Make sure your UnixODBC drivers are up to date.
• Are your DBI and DBD modules up to date?
• You might want to check Short guide to DBI (The Perl Database Interface Module) by dominus if you need a good intro to DBI.

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