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Hi,
I have created a view which accesses a remote instance over a database link.
(lots of views actually).
If I execute the simple statement - 'select * from myview;' - it produces the following plan :-
select * from myview;
SELECT STATEMENT (REMOTE) Optimizer=CHOOSE (Cost=1645 Card=41 Bytes=46617)
NESTED LOOPS (OUTER) (Cost=1645 Card=41 Bytes=46617)
NESTED LOOPS (OUTER) (Cost=1642 Card=3 Bytes=3345)
NESTED LOOPS (OUTER) (Cost=1636 Card=3 Bytes=3252) "
create table mytable as select * from my view;
CREATE TABLE STATEMENT Optimizer=CHOOSE (Cost=735 Card=2 Bytes=1642)
LOAD AS SELECT
NESTED LOOPS (OUTER) (Cost=735 Card=2 Bytes=1642)
NESTED LOOPS (OUTER) (Cost=733 Card=2 Bytes=1598) NESTED LOOPS (OUTER) (Cost=729 Card=2 Bytes=1536) NESTED LOOPS (OUTER) (Cost=725 Card=2 Bytes=1496) NESTED LOOPS (OUTER) (Cost=721 Card=2 Bytes=1458) NESTED LOOPS (OUTER) (Cost=717 Card=2 Bytes=1322) NESTED LOOPS (Cost=715 Card=2 Bytes=1218) NESTED LOOPS (OUTER) (Cost=713 Card=2 Bytes=1126) NESTED LOOPS (OUTER) (Cost=711 Card=2 Bytes=1010) HASH JOIN (Cost=404 Card=4050 Bytes=1146150) REMOTE* (Cost=23 Card=69 Bytes=3864) REMOTE* (Cost=380 Card=21133 Bytes=4797191) REMOTE* (Cost=17 Card=882 Bytes=45864) "
Is this behaviour normal? .. How do clever people handle these queries?
Thanks in advance :-)
George Barbour.
Received on Fri Aug 03 2001 - 02:56:21 CDT