Sorry, I have never used it. We do have one system which uses a uuid, but not one
generated by Oracle. The function did not exist when that system was implemented.
Ian
-----Original Message-----
Sent: Thursday, October 31, 2002 11:41 AM
To: Multiple recipients of list ORACLE-L
Thanks Ian, I don't recall every playing with that function.
Have you ever done any performance testing on it?
Jared
"MacGregor, Ian A." <[EMAIL PROTECTED]>
Sent by: [EMAIL PROTECTED]
10/31/2002 09:13 AM
Please respond to ORACLE-L
To: Multiple recipients of list ORACLE-L <[EMAIL PROTECTED]>
cc:
Subject: RE: Database Design: unique PK across all tables
If you want to use globally unique identifiers Oracle has a sys_guid
function to provide this. There should never be any "additional
meaning" placed in keys.
Ian MacGregor
Stanford Linear Accelerator Center
[EMAIL PROTECTED]
-----Original Message-----
Sent: Thursday, October 31, 2002 5:33 AM
To: Multiple recipients of list ORACLE-L
Our developers are proposing a database design for an OLTP application
in which each table has a PK of the same type and size. In addition, each
possible PK value can belong to at most one table.
Each table insert would require a call to the a single function to get
the next PK value and an additional table would be used to store the
current set of values. (The developers want to put some additional
meaning into a PK value and a sequence would not be sufficient, hence the
need for the PK generating function and current value table).
I've never seen this done before and I would think this application
would suffer greatly from contention when performing a large number of
concurrent inserts.
Has anyone ever encountered a design like this? Is this a bad design?
Thanks.
Brian
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