Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable L.S., =20 We currently have an DBMS that estimates the cost of a query. If the = cost is higher than a certain value the DBMS itself returns an error stating the query is too expensive. Cursing in the church (list) of course, but this ingres. The query is not executed actually. The query optimizer itself creates a plan and checks the cost. When too high it gives the signal. = Is a lot faster than any solution using something like rownum < value, = especially with ordered queries. Is there such a threshold in oracle that can be = set with the same benefits: - early warning of 'costly' queries - doing only optimizing for the query =20 Looking for handles to start digging. =20 TIA,=20 Eric Buddelmeijer=20 DBA=20 e-mail Eric.Buddelmeijer@xxxxxxxxxx=20 "Thou shallst be critical towards advice of guru's" (From "Commandments (10) for better database design" by Ren=E9 Veldwijk) = Dit bericht en alle eventueel meegestuurde documenten zijn vertrouwelijk = en alleen bestemd voor degene aan wie het bericht geadresseerd is. Indien u = dit bericht heeft ontvangen terwijl u niet de geadresseerde bent, verzoeken = wij u het bericht te vernietigen en ons daarvan in kennis te stellen. Dit bericht is tevens gecontroleerd op computervirussen. =20 This e-mail and any files transmitted with it are confidential and = intended solely for the use of the individual or entity to whom they are = addressed. If you have received this e-mail in error, please delete the message and notify us. This e-mail message has been swept by MIMEsweeper for the presence of computer viruses . =20 -- //www.freelists.org/webpage/oracle-l