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RE: Is it correct way of adding two tables without having self-jo

From: Sandeep Kurliye <Sandeep_at_almoayyedintl.com.bh>
Date: Fri, 26 Jul 2002 22:24:18 -0800
Message-ID: <F001.004A3ED7.20020726222418@fatcity.com>


Do you think there is any reason for adding same tables two times without having self join condition???

IMHO, Oracle development guys has done some mistake....

-----Original Message-----

From:	Straub, Dan [mailto:Dan.Straub_at_McKesson.com]
Sent:	Fri 7/26/2002 22:44
To:	Multiple recipients of list ORACLE-L
Cc:	
Subject:	RE: Is it correct way of adding two tables without having self-jo

Have you done both an explain and sqltrace on the query to see how it is being executed and where the time is being spent? I would start there.

Dan Straub
McKesson Information Solutions
541-681-8278
4403'N 12305'W (or thereabouts)
Confidentiality Notice: This e-mail message, including any attachments, is for the sole use of the intended recipient(s) and may contain confidential and privileged information. Any unauthorized review, use, disclosure or distribution is prohibited. If you are not the intended recipient, please contact the sender by reply e-mail and destroy all copies of the original message.

-----Original Message-----
<mailto:Sandeep_at_almoayyedintl.com.bh> ]
Sent: Friday, July 26, 2002 6:13 AM
To: Multiple recipients of list ORACLE-L self-join

condition in Oracle HRMS

Hi Guys,

I need your comments on following view. This view has been written by Oracle Development guys. I raised iTAR for this view problem with Oracle HRMS group, and they suggested to raise it with RDBMS Group. When I raised iTAR with RDBMS Group, I get answer that Oracle guys are only for product support. And he has suggested to discuss this in Forums. I've put this question in Metalink forum as well as http://www.oracle.com/forums <http://www.oracle.com/forums> .

I am having tremendous problem with this view. Even if I select just 'select * from this_view;', it takes long time to give result.

May I have your comment please?

Thanks.

########################################################################
#####

Application: Oracle HRMS
Version: 11.5.3 & 11.5.5
View Name: PAY_ASSIGNMENT_ACTIONS_V2

View Query:
SELECT DISTINCT paa.ROWID row_id, paa.assignment_id,

paa.assignment_action_id, 
per.person_id, SUBSTR ( pay_gb_payroll_actions_pkg.get_salary (
asf.pay_basis_id, asf.assignment_id, rppa.date_earned), 1, 60 ) salary,

SUBSTR (INITCAP (hr_general.decode_pay_basis (asf.pay_basis_id)),1,30)pay_basis,
job.name job_title, per.full_name, per.title, SUBSTR (per.first_name, 1, 1) || ' ' || SUBSTR (per.middle_names, 1, 1) initials, per.last_name, asf.assignment_number, asf.location_id,

asf.internal_address_line, per.national_identifier ni_number, per.expense_check_send_to_address,

rppa.date_earned date_earned, paa.payroll_action_id,
rpaa.assignment_action_id run_assignment_action_id, 
rpaa.payroll_action_id run_payroll_action_id, rppa.time_period_id
time_period_id, rppa.payroll_id payroll_id, NVL (rppa.pay_advice_date, ptp.pay_advice_date) pay_advice_date,
ppg.segment1, ppg.segment2, ppg.segment3, ppg.segment4, 
ppg.segment5, ppg.segment6, ppg.segment7, ppg.segment8, 
ppg.segment9, ppg.segment10, ppg.segment11, ppg.segment12, 
ppg.segment13, ppg.segment14, ppg.segment15, ppg.segment16, 
ppg.segment17, ppg.segment18, ppg.segment19, ppg.segment20, 
ppg.segment21, ppg.segment22, ppg.segment23, ppg.segment24, 
ppg.segment25, ppg.segment26, ppg.segment27, ppg.segment28, 
ppg.segment29, ppg.segment30 

FROM per_jobs job,

per_all_assignments_f asf, 
per_people_f per, 
pay_assignment_actions paa, /* prepayment assignment action */ 
pay_payroll_actions ppa, /* prepayment payroll action */ 
pay_assignment_actions rpaa, /* run assignment action */ 
pay_payroll_actions rppa, /* run payroll action */ 
pay_action_interlocks il, 
per_time_periods ptp, 
pay_people_groups ppg 

WHERE paa.payroll_action_id = ppa.payroll_action_id

AND ppa.action_type IN ('U', 'P') 
AND ppa.action_status = 'C' 
AND ppa.payroll_id = rppa.payroll_id 
AND ppa.effective_date >= rppa.effective_date 
AND rpaa.assignment_id = paa.assignment_id
AND ppg.people_group_id(+) = asf.people_group_id 
AND job.job_id(+) = asf.job_id 
AND per.person_id = asf.person_id 
AND paa.assignment_id = asf.assignment_id 
AND rppa.date_earned BETWEEN asf.effective_start_date AND asf.effective_end_date
AND ptp.time_period_id = rppa.time_period_id AND rppa.date_earned BETWEEN per.effective_start_date AND per.effective_end_date
AND rppa.payroll_action_id = rpaa.payroll_action_id 
AND rpaa.assignment_action_id = il.locked_action_id 
AND paa.assignment_action_id = il.locking_action_id 
AND il.ROWID = (SELECT SUBSTR ( MAX ( LPAD (aa.action_sequence, 15, 0) || loc.ROWID ), -18 ) /* Length of rowid */ latest_act
                          FROM pay_assignment_actions aa, 
                           pay_action_interlocks loc 
                            WHERE loc.locked_action_id =
aa.assignment_action_id 
                            AND loc.locking_action_id =
paa.assignment_action_id);
.

Observations:



1.Table pay_assignment_actions has been referenced 2 times in 'From' clause of view text. This is done generally in case of self join. But there is no self join condition written in 'Where' clause. Conditions for this table are as follows.
  1. ppa.payroll_id = rppa.payroll_id
  2. rpaa.assignment_id = paa.assignment_id In above conditions, joining columns are same columns. Hence this is not a Self Join scenario.
  3. Table pay_payroll_actions has also been referenced 2 times in 'From' clause of view text. Problem is exactly same as per above point. Condition for this table are as follows.
  4. paa.payroll_action_id = ppa.payroll_action_id
  5. ppa.effective_date >= rppa.effective_date Here, difference is in condition 'b'. This seems to be inappropriate. This condition will result in Cartesian product. But because of 'distinct' clause in view text, it is not giving duplicate rows.

Questions:


  1. Is it correct way of writing query? Imho, there is some mistake done by development team.
  2. Not sure whether this view is giving desired result.
  3. As data is growing day by day, performance of this view is becoming poor. Can we optimize this view?

Any expert comments?

Thanks.
Sandeep.

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Received on Sat Jul 27 2002 - 01:24:18 CDT

Original text of this message

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