Alas, though plausible at first, it turns out that that wasn't it. I modified the script in question to get the data one row at a time, and the same limit is hit. The file actually received is precisely the same that I get when I use selectall_arrayref.
In retrospect, if apache is able to use all free memory on the server, there should be no such limit. After all, there are several GB RAM available, and even a ridiculously large recordset from the DB would only be a few MB. We're talking a 64 bit Windows server here, with a 64 bit build of Apache's web server, and a 64 bit build of MySQL. If any of those server products have trouble with even a few MB of data, then there is a serious problem with it. And the perl we're using (v 5.16) is a 64 bit build, so there ought not be a problem there. But that constraint is so consistent, it must be a constraint imposed somewhere: but where do I look?
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