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- <li><em>date</em>: Thu Feb 10 10:59:36 2005</li>
- <li><em>from</em>: jkinney at localnetsolutions.com (James P. Kinney III)</li>
- <li><em>in-reply-to</em>: <<a href="msg00344.html">[email protected]</a>></li>
- <li><em>references</em>: <<a href="msg00253.html">[email protected]</a>> <<a href="msg00262.html">[email protected]</a>> <<a href="msg00343.html">[email protected]</a>> <<a href="msg00344.html">[email protected]</a>></li>
- <li><em>subject</em>: [ale] database conversion</li>
I have been considering that method as well. The drawbacks are
intermittent connectivity (fixable with a secondary script to cache and
retry when connectivity returns) the overall size of the originating
codebase (Interchange is freaking HUGE!)
>
> On Thu, 2005-02-10 at 09:51, James P. Kinney III wrote:
> > More brainstorming (after a mail crash yesterday!)
> >
> > Postgresql 8 has a pretty good Write Ahead Logging. A seperate project I
> > am looking at is to use the WAL as a way to syncronize two databases
> > that are not in a mirror mode of any type.
> >
> > The scenario: Main DB has the _real_ web transactions, user list,
> > products, etc. Second machine gats a clone of the main machine at a
> > point in time. Second machine is hauled to a trade show where the net
> > access is (or lack) prevents a direct line to the main db.
> >
> > Second machine runs the transaction locally after a checkpoint in the
> > WAL is set. After the show, the WAL is replayed back into the main
> > machine to merge in the transactions from the satellite unit.
> >
> > Other than the obvious issues of duplicated transactions (not likely
> > except for possibly adding a new user) and the sequence id's for the
> > transactions (I will have to double check that the sequencing id's are
> > only used as record counters), are there any "gotcha's" that others have
> > run across in anything similar?
>
> _______________________________________________
> Ale mailing list
> Ale at ale.org
> <a rel="nofollow" href="http://www.ale.org/mailman/listinfo/ale">http://www.ale.org/mailman/listinfo/ale</a>
--
James P. Kinney III \Changing the mobile computing world/
CEO & Director of Engineering \ one Linux user /
Local Net Solutions,LLC \ at a time. /
770-493-8244 \.___________________________./
<a rel="nofollow" href="http://www.localnetsolutions.com">http://www.localnetsolutions.com</a>
GPG ID: 829C6CA7 James P. Kinney III (M.S. Physics)
<jkinney at localnetsolutions.com>
Fingerprint = 3C9E 6366 54FC A3FE BA4D 0659 6190 ADC3 829C 6CA7
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<ul><li><strong>Follow-Ups</strong>:
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<li><strong><a name="00358" href="msg00358.html">[ale] database conversion</a></strong>
<ul><li><em>From:</em> david.muse at firstworks.com (David Muse)</li></ul></li>
</ul></li></ul>
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<li><strong><a name="00253" href="msg00253.html">[ale] database conversion</a></strong>
<ul><li><em>From:</em> jkinney at localnetsolutions.com (James P. Kinney III)</li></ul></li>
<li><strong><a name="00262" href="msg00262.html">[ale] database conversion</a></strong>
<ul><li><em>From:</em> kaboom at gatech.edu (Chris Ricker)</li></ul></li>
<li><strong><a name="00343" href="msg00343.html">[ale] database conversion</a></strong>
<ul><li><em>From:</em> jkinney at localnetsolutions.com (James P. Kinney III)</li></ul></li>
<li><strong><a name="00344" href="msg00344.html">[ale] database conversion</a></strong>
<ul><li><em>From:</em> cfowler at outpostsentinel.com (Christopher Fowler)</li></ul></li>
</ul></li></ul>
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