A journal is significantly more difficult to query, and performance would be orders of magnitude better with a database table vs. a journal.
Mark Murphy
STAR BASE Consulting, Inc.
mmurphy@xxxxxxxxxxxxxxx
-----"Steinmetz, Paul" <PSteinmetz@xxxxxxxxxx> wrote: -----
To: "'Midrange Systems Technical Discussion'" <midrange-l@xxxxxxxxxxxx>
From: "Steinmetz, Paul" <PSteinmetz@xxxxxxxxxx>
Date: 04/13/2016 08:45AM
Subject: RE: IBM i 7.3 Temporal tables
What would be the difference between a temporal table and a PF that is journaled?
Wouldn't a journal receiver be able to give you the same result?
Paul
-----Original Message-----
From: MIDRANGE-L [mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of Arco Simonse
Sent: Tuesday, April 12, 2016 1:21 PM
To: Midrange Systems Technical Discussion
Subject: IBM i 7.3 Temporal tables
Today IBM announced IBM i 7.3.
Great enhancements are in it, there is also the great feature for temporal tables, which is fulfilling long-cherished wishes of some of us.
For what is published yet on:
https://www.ibm.com/developerworks/community/wikis/home?lang=en#!/wiki/IBM%20i%20Technology%20Updates/page/IBM%20i%207.3%20-%20Base%20Enhancements
and in the new SQL Reference at:
https://www.ibm.com/support/knowledgecenter/ssw_ibm_i_73/db2/rbafzintro.htm
it looks like only system time temporal tables will be supported.
System time involves tracking when changes are made to the state of a table, such as when an insurance policy is modified or a loan is created.
Business time involves tracking the effective dates of certain business conditions, such as the terms of an insurance policy or the interest rate of a loan. (Business time is sometimes referred to as valid time or application time.) Indeed, some organizations need to track both types of temporal data in one table; such tables would be considered bitemporal.
Granted that this system time support is at least a good start, many businesses that are interested in the use of temporal tables would profit most from the use of business time temporal tables and bitemporals, so that for example you can do:
SELECT vin, rental_car, coverage_amt
FROM policy FOR BUSINESS_TIME AS OF '2012-06-20'
WHERE id = 1111;
Hopefully IBM will add these business time and bitemporal features soon in subsequent database PTF's.
Regards,
-Arco
--
This is the Midrange Systems Technical Discussion (MIDRANGE-L) mailing list To post a message email: MIDRANGE-L@xxxxxxxxxxxx To subscribe, unsubscribe, or change list options,
visit:
http://lists.midrange.com/mailman/listinfo/midrange-l
or email: MIDRANGE-L-request@xxxxxxxxxxxx Before posting, please take a moment to review the archives at
http://archive.midrange.com/midrange-l.
Please contact support@xxxxxxxxxxxx for any subscription related questions.
midrange.com
