In case you have your own slow SQL query, you can optimize it automatically here.
For the query above, the following recommendations will be helpful as part of the SQL tuning process.
You'll find 3 sections below:
CREATE INDEX calendrier_idx_id_date ON calendrier (id_date);
SELECT
to_char(calendrier.id_date,
'DD/MM/YYYY HH24:MI:SS')
FROM
calendrier
WHERE
calendrier.id_date = to_date('26/08/2016', 'DD/MM/YYYY')