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Re: OT: Ways of managing changes to a database's structure during a project.

by podian (Scribe)
on Feb 05, 2004 at 21:25 UTC ( #326893=note: print w/replies, xml ) Need Help??


in reply to OT: Ways of managing changes to a database's structure during a project.

As I see it this is a general database based project problem but I have not seen much discussion on it here or elsewhere (please correct if wrong). For the record I am using Postgres 7.4.

It is also an standard upgrade problem - What to do when you go from one version to the next version which changes the datbase structure.

You have more chanllenges when doing it on a live system where the database can't go down (or may be can go down only for few minutes).

I agree that each change must be versioned so that, for example you can go from version 1 to 3 (skipping version 2).

One interesting problem to consider is:

Say a customer has version 1.

you made a table change (new column X) in version 2

You made another table change in version 3 (new column Y

Now your version 3 SQL will have only 'add column Y'

To upgrade from version 1 to 3, you need to combine both changes or upgrade to version 2 first and then upgrade to version 3

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[hippo]: karlgoethebier, Ich habe kein Deutsch.
[Corion]: choroba: A Bembel is a traditional pottery ware, which is only(!) used for serving Cider (well, Apfelwein)
[shmem]: choroba: it's hessisch
[Corion]: Not every Krug is a Bembel!
[karlgoethebier]: there is just the mug: 🍺
[Corion]: A Bembel must look like this
[karlgoethebier]: https://de. wikipedia.org/ wiki/Bembel#/ media/File: Bembel_Zum_blauen_ Bock_1978.jpg
[choroba]: as my friend says, Ich stehe Deutsche ver nicht aber klein ;-)
[Corion]: Krug is generic pottery ware for pouring beverages, but a Bembel is painted with that blue paint and contains only (!) Apfelwein
[shmem]: Corion: alas, air too.

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