Select querry - performence

Hi all,
I want to clarify one thing...........
1. select F1 F2 F3
         from X
         into table itab
         where F1 in s_F1
         and F2 in s_F2.
2. Select * from X into table itab.
here itab type table of X.
which select statement will give less perfomence and is there any relation betwwen table size and perfomence of select querry?
If there is a relation let me know how to find it..........
Thanks,
kk.

Hi Kusuma,
the answer is, it depends (as you already have read in the other postings):
If both ranges are filled and you have an index on both fields (as the two first columns of the index - may be with the client in the first place), the first statement will probably run faster than the second in most cases, because it has to read less blocks from disk. This could be also incorrect if the selectivity of your ranges is bad and your table is huge.
If your ranges in the query are not filled, than both statements are equivalent and read the same amount from disk. If the table has more columns than three, then the first query may be a bit faster because it has not as many data to transfer between database and application.
If only the second range is filled and you have no suitable index on column F2, than the first query could run even longer than the second because some databases (Oracle and DB2, may be MS SQL Server too) could create execution plans which reads the table multiple times. It depends on your indexes and their statistics if it happens or not. In most cases, it will run not longer than the second statements, but in rare situation it could run considerably longer.
You see, SQL is complex and the execution depends heavily on the implementation in the database management system itself.
One additional comment. If your ranges contains only single values, it would be much better for the stability of your coding if you use FOR ALL ENTRIES. The database interface could create suitable junks of values if you use FOR ALL ENTRIES. If you use IN range, this could not be done and if the range gets to big (bigger than the maximum statement size), you'll get a dump. For simple queries with only two ranges this is not very likely, but if your example grows, it's getting more and more likely.
Best regards
Ralph Ganszky

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P.S. Please close the issue and reward points to helpful answer once Query is solved.
Message was edited by: Amit Khare

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Code Formatted by: Alvaro Tejada Galindo on Jan 8, 2009 10:58 AM

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Message was edited by:
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Edited by: Sãnthosh Kûmãr V on Oct 8, 2008 10:44 AM
Edited by: Sãnthosh Kûmãr V on Oct 8, 2008 10:45 AM

Select querry - performence

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