Ratnesh,
Oracle will return the rows in order of physical access, which is
determined by the access path. This can be a full table scan, index read or
the result set from another operation. If parallelism is used, the return
order can be altered. Updates/Deletes, export/import, rebuilds will almost
certainly alter the physical v. logical order of the rows.
The only way to guarantee that the order returned is the order
inserted is to add a sequential indicator, this could be a derived sequence
number or a timestamp of sufficient granularity (dependent on # of rows
inserted per second) and then add an 'ORDER BY' clause.
-----Original Message-----
Sent: Tuesday, October 22, 2002 4:39 AM
To: Multiple recipients of list ORACLE-L
Hi
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 gauranteed 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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