Re: Temporal tables: Follow up questions

Hi Luis,

Personally I like the temporal primer for DB2 on developerworks:
https://www.ibm.com/developerworks/data/library/techarticle/dm-
1204db2temporaldata/

It is for DB2 LUW but it explains it well. The option for temporal tables
"FOR BUSINESS TIME" is not (yet?) implemented on IBM i.

Best regards,
-Arco

2017-05-15 19:04 GMT+02:00 Luis Rodriguez <luisro58@xxxxxxxxx>:

Rob,



Temporal tables are a feature that I find very interesting. Do you
have/know any particular link (beyond the SQL reference manual) that

could

help me start in the right direction?


Thanks in advance,

Luis


P.S.: The reference to the S/36 guy would be a lot funnier if, sadly,

were

not so commonly true…

On Mon, May 15, 2017 at 10:18 AM Rob Berendt <rob@xxxxxxxxx> wrote:

I recently gave a presentation to our local user group on Temporal

Tables.

Basically I took an existing Infor table, added columns necessary for
temporal tables, and did it all without recompiling any of their
applications.

Some of the follow up questions they asked were really good. Such as:

- What indexing strategies should be used on the history tables?
- Can you specify that the history table be in a different ASP?

Of course, the guy who still codes in S/36 RPG was wondering if an RPG
CHAIN would work.
And I did have to explain that you had to use temporal clauses like AS

OF

and that just doing it in your where clause would not work.

I showed them how to query syspartitionstat to estimate I/O's that

might

be hitting history.
And how to query syslimits to find the number of rows a single
partition(member) can hold.
A discussion of DB2 Multisystem ensued.


Rob Berendt
--
IBM Certified System Administrator - IBM i 6.1
Group Dekko
Dept 1600
Mail to: 2505 Dekko Drive
Garrett, IN 46738
Ship to: Dock 108
6928N 400E
Kendallville, IN 46755
http://www.dekko.com

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