Try setting the LongReadLen attribute of $dbh .. see DBI docs for details (not sure what value you need for your purposes--i arbitrarily chose 8000). 
my $dbh = DBI->connect($data_source, $username, $auth, { LongReadLen=>
+8000 } );
# OR
$dbh->{LongReadLen} = 8000;

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See also Working with CLOB

In reply to Re: Updating a CLOB using DBI by davidrw
in thread Updating a CLOB using DBI by Anonymous Monk

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