Comments on: Getting started with Mnesia

By: Tim

Tim — Wed, 28 Sep 2011 22:15:10 +0000

Thank you! I was finally able to get Mnesia working the way I wanted in my Erlang application thanks to this tutorial. Mnesia is the weakest spot of Erlang’s otherwise excellent documentation. (although as a reference the official Mnesia documentation is good, it just lacks meaningful examples, which your tutorial addresses)

Regards,
Tim

By: CiaranG

CiaranG — Sun, 17 Aug 2008 11:57:03 +0000

@gp:

1. Lots
2. You can choose to set it up either way
3. Yes

By: gp

gp — Sat, 16 Aug 2008 22:29:12 +0000

So how many records can Mnesia hold?

Is it stored on the hard drive or in memory?

If you cluster Erlang nodes together, can they shared database space?

By: CiaranG

CiaranG — Wed, 14 Nov 2007 17:10:25 +0000

Falko, thanks for that. The first fun() was correct and the second two wrong (now corrected) unless I missed something. I think in future I’d better just paste in from my working code instead of typing it up from memory!

By: Falko

Falko — Sun, 11 Nov 2007 13:25:48 +0000

Hi.

Many thanks for the text. It s a nice intro.

Two hints:

1. The “Fun fun() …” (3 times) has to read “Fun = fun() …”.

2. The query list comprehension thing needs an include. Something like
-include(“qlc.hrl”).

I had actually to provide the compülete path. At Windows something like
-include(“C:\\Program Files\\erl5.5.5\\lib\\stdlib-1.14.5\\include\\qlc.hrl”).

regards, f.

By: CiaranG

CiaranG — Mon, 22 Oct 2007 23:28:45 +0000

Cadar, thanks for that – fixed it.

By: Cadar

Cadar — Mon, 22 Oct 2007 22:20:43 +0000

It’s a small error, this line

io:format(“~p~n”,Row#animal.noise).

should be

io:format(“~p~n”,[Row#animal.noise]).

By: Mr eel

Mr eel — Sat, 22 Sep 2007 23:56:41 +0000

Thanks very much for writing this! It’s just the kick-off I needed to get started with Mnesia.

I’m very impressed with it so far, but I’m really just fumbling about at the moment as I’m still trying to get a grasp of Erlang. Still, it’s all really interesting.