See the section Handling BLOB / LONG / Memo Fields in the DBI docs
In this situation, the value of the $h->{LongReadLen} attribute is used to determine how much buffer space to allocate when fetching such fields. The $h->{LongTruncOk} attribute is used to determine how to behave if a fetched value can’t fit into the buffer.

In reply to Re: Inserting a Long Raw into an Oracle table fails above 32512 bytes by moritz
in thread Inserting a Long Raw into an Oracle table fails above 32512 bytes by jonnybuchanan

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