Oracle-L: RE: will the Return Order of rows change with time ?

From: Ratnesh Kumar Singh <ratnesh.singh_at_patni.com>
Date: Tue, 22 Oct 2002 22:58:46 -0800
Message-ID: <F001.004F09AD.20021022225846@fatcity.com>

Thanks a lot to all those people who replied to my query. answering stephane question : the table is 500MB+ , and there is no unique key since it is a child table. Moreover presently i cannot modify the table.

The general concensus is that there is no guarantee of return order of rows without using order by clause. Anybody knows why this is so ?
Oracle must be having a fixed algorith for data access , probably using the extent map.

Assuming
1. no query parallelism & no deletes/updates to table 2. no index/optimizer/structure changes
the data retrieval path should not change with time for the same query ??

thanks & regards
ratnesh singh

-----Original Message-----
Kumar Singh
Sent: Tuesday, October 22, 2002 4:09 PM
To: Multiple recipients of list ORACLE-L

I have a very large DW table in which there are only inserts and NO updates/deletes.The table grows by around 2-5 % every week due to new inserts.

I need to return the rows for each customer in the same order as inserted to table.Due to design/delivery constraints , i cannot modify the table.

ques 1 : if i do a 'select * from table' with where clause but no order by clause,will the Order of rows returned be the same whenever this query is executed ? Is this guaranteed by Oracle ?

ques 2 : if i export/import this table , then execute the same query, will the Order of rows returned be the same as before the export/import ?

ques 3 : if i use the 'move' cmd to rebuild this table , then execute my query,will the Order of rows returned be the same as before the rebuild ?

any explanations are most welcome....

many thanks
ratnesh singh

Ratnesh Kumar Singh
Sr. Software Engineer
Patni Computer Systems Ltd
TTC Mahape , Navi Mumbai
Work : (91 22) 7611090/110/128/350 Ext. 2107/2106 Home : (91 22) 8662162
http://www.patni.com
World-Wide Partnerships. World-Class Solutions.

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Received on Wed Oct 23 2002 - 01:58:46 CDT