Return-Path: Received: from newsfeed.cts.com (newsfeed.cts.com [209.68.248.164]) by naude.co.za (8.11.2/8.11.2) with SMTP id g2EEUP418954 for ; Thu, 14 Mar 2002 09:30:25 -0500 Received: from fatcity.UUCP (uucp@localhost) by newsfeed.cts.com (8.9.3/8.9.3) with UUCP id GAA17460; Thu, 14 Mar 2002 06:24:30 -0800 (PST) Received: by fatcity.com (26-Feb-2001/v1.0g-b70/bab) via UUCP id 00428D99; Thu, 14 Mar 2002 03:26:15 -0800 Message-ID: Date: Thu, 14 Mar 2002 03:26:15 -0800 To: Multiple recipients of list ORACLE-L X-Comment: Oracle RDBMS Community Forum X-Sender: "Mark Leith" Sender: root@fatcity.com Reply-To: ORACLE-L@fatcity.com Errors-To: ML-ERRORS@fatcity.com From: "Mark Leith" Subject: RE: SQL queries Organization: Fat City Network Services, San Diego, California X-ListServer: v1.0g, build 70; ListGuru (c) 1996-2001 Bruce A. Bergman Precedence: bulk Mime-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0100_01C1CB43.859C1290" ------=_NextPart_000_0100_01C1CB43.859C1290 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Cheers Lee! One up for the "bad guys"! ;P -----Original Message----- From: root@fatcity.com [mailto:root@fatcity.com]On Behalf Of Robertson Lee - lerobe Sent: 12 March 2002 16:24 To: Multiple recipients of list ORACLE-L Subject: SQL queries All, Following SQL runs for ages (almost 2 hours) select * from table1 addr, table2 pers, table3 lookup table4 cust where cust.customer_key = lookup_customer_key and lookup_address_key = addr_address_key and lookup.person_key = pers.person_key and rownum < 1000; when this is changed to select /*+ FIRST_ROWS */ ADDR.*, PERS.*, LOOKUP.*, CUST.* from table4 cust, table2 pers, table3 lookup table1 addr where cust.customer_key = lookup.customer_key + 0 and lookup.address_key = addr.address_key and pers.person_key = lookup.person_key + 0 and rownum < 1000; this runs instantaneously. I realise that 99.99% of the improvement is down to the first_rows hint BUT, why does the SQL tool use the list of table aliases with .* after it AND what on earth are the + 0s' on two lines of the predicate list. Confused Lee PS. The Tool is SQLExpert brought to you by those nice blokes at cool-tools (Cheers Mark Leith !!) and is proving absolutely priceless here at the moment. TIA The information contained in this communication is confidential, is intended only for the use of the recipient named above, and may be legally privileged. If the reader of this message is not the intended recipient, you are hereby notified that any dissemination, distribution or copying of this communication is strictly prohibited. If you have received this communication in error, please re-send this communication to the sender and delete the original message or any copy of it from your computer system. ------=_NextPart_000_0100_01C1CB43.859C1290 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Cheers=20 Lee! One up for the "bad guys"! ;P
-----Original Message-----
From: root@fatcity.com=20 [mailto:root@fatcity.com]On Behalf Of Robertson Lee -=20 lerobe
Sent: 12 March 2002 16:24
To: Multiple = recipients=20 of list ORACLE-L
Subject: SQL queries

All,
 
Following SQL runs=20 for ages (almost 2 hours)
 
select * from=20 table1 addr,
table2=20 pers,
table3=20 lookup
table4=20 cust
where=20 cust.customer_key =3D lookup_customer_key
and=20 lookup_address_key =3D addr_address_key
and=20 lookup.person_key =3D pers.person_key
and = rownum <=20 1000;
 
when = this is=20 changed to
 
select /*+=20 FIRST_ROWS */
ADDR.*,
PERS.*,
LOOKUP.*,
CUST.*
from = table4=20 cust,
table2=20 pers,
table3=20 lookup
table1=20 addr
where=20 cust.customer_key =3D lookup.customer_key + 0
and=20 lookup.address_key =3D addr.address_key
and=20 pers.person_key =3D lookup.person_key + 0
and = rownum <=20 1000;
 
this = runs=20 instantaneously. I realise that 99.99% of the improvement is down to = the=20 first_rows hint BUT, why does the SQL tool use the list of table = aliases with=20 .* after it AND what on earth are the + 0s' on two lines of the = predicate=20 list.
 
Confused
 
Lee
 
PS. = The Tool is=20 SQLExpert brought to you by those nice blokes at cool-tools (Cheers = Mark Leith=20 !!) and is proving absolutely priceless here at the=20 moment.
 
 
TIA
 


The=20 information contained in this communication is
confidential, is = intended=20 only for the use of the recipient
named above, and may be legally=20 privileged. If the reader
of this message is not the intended = recipient,=20 you are
hereby notified that any dissemination, distribution = or
copying=20 of this communication is strictly prohibited.
If you have received = this=20 communication in error, please
re-send this communication to the = sender=20 and delete the
original message or any copy of it from your=20 computer
system.
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