I've never come across this problem before myself, but a quick scan of the DBI documentation reveals this:

By default, LongTruncOk is false and so fetching a long value that needs to be truncated will cause the fetch to fail. (Applications should always be sure to check for errors after a fetch loop in case an error, such as a divide by zero or long field truncation, caused the fetch to terminate prematurely.)

Hopefully that'll set you on the right path.

Update: A couple more things: here's the DBI documentation, and also a guide on how to read the friendly manual.

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