I am aware of a similar issue with DBI code. In particular, the use of selectall or fetchall, compared with fetchrow. I have seen instances.
Depending on your DBD, calling fetchrow() may also slurp the entire result into memory. It just won't give it to you all at once, which might reduce memory usage to some degree in exchange for the added overhead in repeated fetchrow() calls.
If you're serious about avoiding this problem in DBI then you need to use LIMIT and OFFSET (or their cursorly equivalent) to step through your result set.
-sam
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