Help the CBO to make the right choice

Hello everyone. I have a related question performance. I would like to hear your opinion on this. Here's a simple query on the transactions table:

SELECT
     *
FROM
     transaction t
WHERE
         t.transaction_method_type_code = 'CREDIT'
     AND t.process_date BETWEEN TO_DATE ('11-MAR-2015') AND TO_DATE ('12-MAR-2015');

1.bmp

Oracle chooses an index based on the process_date column. I think it's good. When we increase the oracle interval follows a different route:

SELECT
     *
FROM
     transaction t
WHERE
         t.transaction_method_type_code = 'CREDIT'
     AND process_date BETWEEN TO_DATE ('11-MAR-2015') AND TO_DATE ('29-MAR-2015');

2.bmp

Which is understandable, because in this case, transaction_method_type_code is more selective. But real-time direct, we do not hardcode those dates, keep us in a table.

SELECT
     *
FROM
     transaction t JOIN cntrl_process_date ON process_date BETWEEN previous_process_date AND current_process_date
WHERE
     t.transaction_method_type_code = 'CREDIT';

3.bmp

Oracle chooses is no longer the right index finger, even if the difference between the dates of cntrl_process_date is always a day. I can still understand it because he has no idea of CBO are than the actual data. Bind picking concept is not applicable here.

I tried to help CBO by adding a constraint on a cntrl_process_date but it did not help:

ALTER TABLE cntrl_process_date ADD CONSTRAINT cbo_please CHECK (current_process_date - previous_process_date = 1);

Is it possible to help CBO with good choice next to the addition of an indication?

Thanks to you all. I appreciate your time.

No version, so hard to give the best advice. and I think you need to get the Note 'plan_table is old version' since we do not see a sign of the section of the predicate.

One possible strategy - from your Control Panel has a line:

Add a primary key to the table - even if it's through a meaningless key column (holding, say, a value of 1), then change your query to:

Select * transaction t

where process_date between (select previous_process_date in the cntrl_process_date where primary_key = 1)

and (select current _process_date of cntrl_process_date where primary_key = 1)

;

When subqueries are subqueries in single line based on known unique (for example, the primary key) the optimizer evaluates the subquery then optimise the main request - but only in the latest versions of Oracle

Concerning

Jonathan Lewis

UPDATE: just saw your version number - somehow, it became visible only after I wrote my response.  11.1 is too old.

Tags: Database

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