Order of execution of SQL statements

Hello

I have two SQL statements where the first statement executes on a table with more than 40 million lines, the second statement is running on a table more 6 million lines.  When they are running their own each take about 0.15 seconds to run, but when combined they take 20 minutes to run, (the second SQL statement is inserted in the WHERE clause of the statement of first).  It would seem that after combining these statements, the first statement goes through all 40 million lines before it performs the SELECT in the WHERE clause.  I think that what is necessary is to ensure the SELECT in the WHERE clause is executed first... or something like that!  Anyone has any ideas on how to combine these statements but not suffer from the performance impact?

The first statement is:

Select csi.instance_id,

OEL.ordered_item

of apps.csi_item_instances csi,.

Apps.oe_order_lines_all oel

where csi.instance_id in

(1718000,3698000,48740202)

and csi.last_oe_order_line_id = oel.line_id;

The second statement is:

Select / * + INDEX (IEA (attribute_id)) * /.

IEA.instance_id

apps.csi_iea_values do

where iea.attribute_id = 10004

and iea.attribute_value is not null;

The joint return is:

Select csi.instance_id,

OEL.ordered_item

of apps.csi_item_instances csi,.

Apps.oe_order_lines_all oel

where csi.instance_id in

(select / * + INDEX (IEA (attribute_id)) * /)

IEA.instance_id

apps.csi_iea_values do

where iea.attribute_id = 10004

and iea.attribute_value is not null)

and csi.last_oe_order_line_id = oel.line_id;

Thanks for any help,

Mike

Your subquery returns probably just two values that you did originally as constants - but the optimizer thinks that you're going to get 564 K lines.  This is why the indicator for the simple query has a beneficial effect, it forces the Oracle to use an index when it would otherwise make a search.

When the subquery is incorporated, however, the optimizer uses its cardinality expected to decide whether to use a nested loop join or the hash join to CSI_ITEM_INSTANCES, since the large enough estimate, he uses the hash with a join analysis complete.  That's why I pointed out that the fact to tell the optimizer to how many lines outside the subquery should make a difference.

Have you tried the "common table expression" approach, rather than approach no_merge, but it would not help because it does not change the optimizer for cardinality estimate.  If you want to repeat the method CTE adding boards / * + materialize cardinality (2) * / to the query in the WITH clause, you should get the desired result.

Concerning

Jonathan Lewis

Tags: Database

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    -----
    X

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    SELECT SID, to_char (start_time,'hh24:mi:ss') stime,

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    *

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