Still perplexed.... this time information_schema.session_variables 

$dbh->{AutoCommit} = 0;    # SET FOR TRANSACTION
my $result = $dbh->do("SET TRANSACTION ISOLATION LEVEL READ COMMITTED"
+);
print Dumper($result);
my @row_ary = $dbh->selectrow_array("SELECT * FROM information_schema.
+session_variables WHERE variable_name LIKE 'tx_%'");
print Dumper(@row_ary);



$VAR1 = '0E0';
$VAR1 = 'TX_ISOLATION';
$VAR2 = 'REPEATABLE-READ';

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In reply to Re^5: DBI mysql set transaction isolation level by Anonymous Monk
in thread DBI mysql set transaction isolation level by Anonymous Monk

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