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RE: Design Issue - Quick response appreciated

From: Koivu, Lisa <lisa.koivu_at_efairfield.com>
Date: Mon, 24 Sep 2001 10:39:03 -0700
Message-ID: <F001.0039692F.20010924104536@fatcity.com> 









Rao, 




The only way to tell is to autotrace or tkprof.  I would strongly advise doing so because connect by is a performance killer.  If you have to use it, be sure the query isn't doing anything unacceptable.



Lisa Koivu


Oracle Database Administrator


Fairfield Resorts, Inc.


954-935-4117




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

From:   Rao, Maheswara [SMTP:Maheswara.Rao_at_Sungardp3.com]
Sent:   Monday, September 24, 2001 2:24 PM
To:     Multiple recipients of list ORACLE-L


Subject:        RE: Design Issue - Quick response appreciated




Thanks Jay.




Quetion:When we use start with/connect by clause, does Oracle do full table
scan?




Thanks,




Rao




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


Sent: Friday, September 21, 2001 5:25 PM
To: Multiple recipients of list ORACLE-L





Ouch!


I was assuming (for no good reason) that the field you used in your example
(ACCOUNT_ID) is the only one that would change.




In this case I agree with Christopher.  Go with a generated key as your
primary key (your current primary key columns can be an alternate key), then
you can use that as the only prior_id column.




With regards to the second question you can then go back as far as you like
using the START WITH/CONNECT BY clauses in your SELECT statement.




Jay Miller




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


Sent: Friday, September 21, 2001 3:45 PM
To: Multiple recipients of list ORACLE-L





Jay,




Good thought.  Questions:




    
  
  1.   How many prior_ID's do I need to maintain?  Logically, user could change
any of the columns in a primary key.


  
  2.   Say, a transaction udergoes 2 times changes i.e., first time, account_ID
is changed.  Second time, Security_id is changed. This means, I inserted two
records into the transaction table pertaining to original transaction.  How
do I retrieve earlier three records? i.e., the latest change in the
account_id=IBM.  If the user is querying based on this, he would get two
records.  But he would not get the record where he changed security_ID. (My
primary key = Security ID + Account ID + Account
Type + Trade Date).


  
  3.   How do manage and retrieve the records from the child tables?







Thanks,




Rao





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


Sent: Friday, September 21, 2001 2:26 PM
To: Multiple recipients of list ORACLE-L





One thought is to have an additional column called something like
'PRIOR_ID'.  If the Account_id is "changed" (actually a new value inserted)
then the PRIOR_ID for the new row is set to the ACCOUNT_ID of the old row.
That way you can always trace back if the transaction used to have a
different account.


 

 



Jay Miller




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


Sent: Friday, September 21, 2001 12:35 PM
To: Multiple recipients of list ORACLE-L





List,


 



OLTP application with 24x7 requirement. 300,000 records per day are inserted
into the transaction table. Environment: Solari 7. Oracle 817.


 



The transaction table layout.


 



Security ID  


Account ID


Account Type


Trade Date


And other columns in this table.


 



In the above table, the primary key is -- Security ID + Account ID + Account
Type + Trade Date


 



There are many to one relationships built to other child tables from
Transaction Table


 



Scenario:


 



User inserts a record into transaction table.  In the first record, Account
ID value is "HP" and he might insert a record into the child table (Or this
transaction may not insert a record into a child table). After some time,
the user queries the original record with the primary key and then changes
the value in the column - Account ID to  "IBM".  Now, the original
transaction record is NOT UPDATED.  A record IS INSERTED with the new
values.  Also, he might or might not insert a record into a child table with
this new values of primary key.


 



Now the user would query the transaction table with Account ID = IBM.  But,
the user wants to get all the previous records also; in this case, he want
to see the record with Account ID = "HP" also. Also, he want to see the
related records from the child tables. 


 



I tried with the idea of sequence number generation but it was failing.


 



Any ideas or suggestions are much appreciated.


 



Thanks,


 



Rao


Maheswara Rao,


Oracle DBA


SunGard Securities




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Author: Miller, Jay


  INET: JayMiller_at_TDWaterhouse.com



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-- 
Author: Miller, Jay


  INET: JayMiller_at_TDWaterhouse.com



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-- 
Please see the official ORACLE-L FAQ: http://www.orafaq.com
-- 
Author: Rao, Maheswara


  INET: Maheswara.Rao_at_Sungardp3.com



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Received on Mon Sep 24 2001 - 12:39:03 CDT












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