The IBM db2 (which you're not using) docs are old. See https://metacpan.org/pod/distribution/DBI/Changes#Changes-in-DBI-0.83,-11th-June-1997, if you are going to use an undocumented method expect to have no support and to have to do some digging on your own.

In reply to Re^5: checking mysql rows continuously by marto
in thread checking mysql rows continuously by bigup401

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