wrong database order, sorry !SELECT DISTINCT a.idarticle, a.titrearticle, c.nomcategorie
                                        FROM articles a, categories c, articles_categories ac, tags t, tags_articles ta
                                        WHERE (
                                                a.titrearticle
                                                REGEXP "2009"
                                                OR a.contenuarticle
                                                REGEXP "2009"
                                                OR (
                                                    t.nom
                                                    REGEXP "2009"
                                                    AND t.id = ta.idtag
                                                    AND ta.idarticle = a.idarticle
                                                    )
                                                )
                                        AND a.idarticle = ac.idarticle
                                        AND ac.idcategorie = c.idcategorie
                                        ORDER BY a.timestamp DESCQuery execution was interrupted