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:[EMAIL PROTECTED]]
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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