Thanks Andrew, I'll try it. Now I'm testing inside Zope and everything looks well, except for: self.cat.addIndex('id','FieldIndex' ) self.cat.addIndex('name' ,'FieldIndex' ) self.cat.addIndex('observaciones','FieldIndex' ) get_transaction().commit() Zope is telling me that from this version (2.6) I could not addIndex here, must be done outside(where?), in the Application (that I haven't). My problem is that I create the catalog inside the class class Authors: def __init__: .... if self.root.has_key( 'cat' ): self.cat= self.root['cat'] else: self.cat = Catalog() self.cat.aq_parent= self.root self.root['cat']= self.cat ### Here come the index I could not imagine where (and how) could make the indexes. I have seen a lot of documentation that makes references to addIndex... Thanks a lot again Emiliano.