1. Method for preconditioning one or more data tables of a decision application server ( 1 ), intended to be processed by a search engine ( 2 ) responding to queries for selecting records based on given criteria, sent by the decision application server ( 1 ), characterized in that it consists of: analyze ( 14 ) the predicates contained in the fields of the records intended to fill the relational database ( 6 ) in accordance with given authorized relations; create ( 16 ) a nomenclature ( 17 ) of the predicates from this analysis; numerically encoding ( 15 ) the predicates in accordance with the nomenclature ( 17 ), taking the nature of the predicates and the relations to be implemented in the predicates into account in the queries; and in that it consists of presenting the encoded predicates, in the form of a table ( 10 ) of numeric values.