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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