How does one determine the release date of an Ingres patch?
There should be a 'patchbugs' download on the ESD site which lists the fixes included in each patch along with the date of the patch.
From the host on which Ingres is running I do as you suggest and look at the timestamp of the installation files. On a linux platform I might use something like this:
ls -l --full-time ${II_SYSTEM}/ingres/lib/iimerge.a | awk '{print $6}'
(It might not exactly match the date in the patchbugs doc but is usually pretty close).
--- SoupGate-Win32 v1.05
* Origin: fsxNet Usenet Gateway (21:1/5)