diff --git a/database/oracle/mode/redologusage.pm b/database/oracle/mode/redologusage.pm
new file mode 100644
index 000000000..0c90f773a
--- /dev/null
+++ b/database/oracle/mode/redologusage.pm
@@ -0,0 +1,130 @@
+#
+# Copyright 2019 Centreon (http://www.centreon.com/)
+#
+# Centreon is a full-fledged industry-strength solution that meets
+# the needs in IT infrastructure and application monitoring for
+# service performance.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+package database::oracle::mode::redologusage;
+
+use base qw(centreon::plugins::templates::counter);
+
+use strict;
+use warnings;
+use Digest::MD5 qw(md5_hex);
+
+sub custom_get_hitratio_calc {
+    my ($self, %options) = @_;
+
+    my $delta_total = ($options{new_datas}->{$self->{instance} . '_redo_entries'} - $options{old_datas}->{$self->{instance} . '_redo_entries'});
+    my $delta_retry = ($options{new_datas}->{$self->{instance} . '_redo_buffer_alloc_retries'} - $options{old_datas}->{$self->{instance} . '_redo_buffer_alloc_retries'});
+    $self->{result_values}->{retry_ratio} = $delta_total ? (100 * $delta_retry / $delta_total) : 0;
+
+    return 0;
+}
+
+sub set_counters {
+    my ($self, %options) = @_;
+
+    $self->{maps_counters_type} = [
+        { name => 'global', cb_prefix_output => 'prefix_global_output', type => 0 },
+    ];
+
+    $self->{maps_counters}->{global} = [
+        { label => 'retry-ratio', nlabel => 'redolog.retry.ratio.percentage', set => {
+                key_values => [ { name => 'redo_buffer_alloc_retries', diff => 1 }, { name => 'redo_entries', diff => 1 } ],
+                closure_custom_calc => $self->can('custom_get_hitratio_calc'),
+                output_template => 'retry ratio %.2f%%',
+                output_use => 'retry_ratio', threshold_use => 'retry_ratio',
+                perfdatas => [
+                    { label => 'retry_ratio', value => 'retry_ratio', template => '%.2f', min => 0, max => 100, unit => '%' },
+                ],
+            }
+        },
+        { label => 'traffic-io', nlabel => 'redolog.traffic.io.bytespersecond', set => {
+                key_values => [ { name => 'redo_size', diff => 1 } ],
+                output_change_bytes => 1, per_second => 1,
+                output_template => 'traffic io %s %s/s',
+                perfdatas => [
+                    { label => 'traffic_io', value => 'redo_size_per_second', template => '%s', min => 0, unit => 'B/s' },
+                ],
+            }
+        },
+    ];
+}
+
+sub prefix_global_output {
+    my ($self, %options) = @_;
+
+    return 'Redo log ';
+}
+
+sub new {
+    my ($class, %options) = @_;
+    my $self = $class->SUPER::new(package => __PACKAGE__, %options, statefile => 1, force_new_perfdata => 1);
+    bless $self, $class;
+
+    $self->{version} = '1.0';
+    $options{options}->add_options(arguments => {
+    });
+    
+    return $self;
+}
+
+sub manage_selection {
+    my ($self, %options) = @_;    
+
+    my $query = q{
+        SELECT a.value, b.value, c.value
+            FROM v$sysstat a, v$sysstat b, v$sysstat c
+            WHERE a.name = 'redo buffer allocation retries'  
+            AND b.name = 'redo entries'
+            AND c.name = 'redo size'
+    };
+
+    $options{sql}->connect();
+    $options{sql}->query(query => $query);
+    my @result = $options{sql}->fetchrow_array();
+    $options{sql}->disconnect();
+    
+    $self->{global} = {
+        redo_buffer_alloc_retries => $result[0],
+        redo_entries => $result[1],
+        redo_size => $result[2],
+    };
+
+    $self->{cache_name} = "oracle_" . $self->{mode} . '_' . $options{sql}->get_unique_id4save() . '_' .
+        (defined($self->{option_results}->{filter_counters}) ? md5_hex($self->{option_results}->{filter_counters}) : md5_hex('all'));
+}
+
+1;
+
+__END__
+
+=head1 MODE
+
+Check Oracle library cache usage.
+
+=over 8
+
+=item B<--warning-*> B<--critical-*> 
+
+Thresholds.
+Can be: 'retry-ratio', 'traffic-io'.
+
+=back
+
+=cut
diff --git a/database/oracle/plugin.pm b/database/oracle/plugin.pm
index b2394cc01..4e0913299 100644
--- a/database/oracle/plugin.pm
+++ b/database/oracle/plugin.pm
@@ -47,6 +47,7 @@ sub new {
         'long-queries'             => 'database::oracle::mode::longqueries',
         'password-expiration'      => 'database::oracle::mode::passwordexpiration',
         'process-usage'            => 'database::oracle::mode::processusage',
+        'redolog-usage'            => 'database::oracle::mode::redologusage',
         'rman-backup-problems'     => 'database::oracle::mode::rmanbackupproblems',
         'rman-backup-age'          => 'database::oracle::mode::rmanbackupage',
         'rman-online-backup-age'   => 'database::oracle::mode::rmanonlinebackupage',