[erlang-questions] mnesia:transform_table

[Chris Hicks]

Yes I am still modeling tables and I remembered reading your blog, I'm just making sure I understand all of my options beforehand. I'm trying to decide between using a list with key-value pairs, a dict and a proplist. Are there any major disadvantages to using one of those over the other?

> From: igorrs@REDACTED
> Date: Wed, 26 May 2010 03:52:23 -0300
> To: silent_vendetta@REDACTED
> CC: erlang-questions@REDACTED
> Subject: Re: [erlang-questions] mnesia:transform_table
> 
> If you are still modelling the tables, you might also want to consider
> some approach to avoid running mnesia:transform_table/3, since it
> needs to rewrite all the records.
> 
> For example, as described here:
> http://igorrs.blogspot.com/2010/05/mnesia-one-year-later-part-2.html#key_value
> 
> And discussed in this thread (from the third post on):
> http://forum.trapexit.org/viewtopic.php?p=55510&sid=cc3aec96ba9387b61b5d192ccd1de1a6
> 
> Good luck.
> Igor.
> 
> On Wed, May 26, 2010 at 2:09 AM, Chris Hicks
> <silent_vendetta@REDACTED> wrote:
> >
> > So when updating a record definition the updated record, when reloaded, is not compatible with the old version of the record, as far as I understand it. Updating a Mnesia table to handle the new definition is straightforward enough but, my question revolves around the rest of the running system. Mainly I want to know what is the general (if there is one) process to updating a running system in this manner?
> > Should you create a function which locks the whole table, reloads the code and updated all the definitions at the same time? What happens to the rest of the running system when you update a record definition while a process is in the middle of working with that old record?
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> 
> 
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