mnesia
Ulf Wiger
ulf.wiger@REDACTED
Tue Feb 9 07:58:40 CET 1999
Elan wrote:
>
> Hi,
>
> the mnesia manual says that erl should be started with
> -config <path>
>
> pointing at the directory in which the tables are stored. I'd rather set
> that path programmatically. Can that be done? How?
>
> TIA,
>
> Elan
I believe that it's really -mnesia dir <Dir>
The 'dir' parameter can be set from the command line:
erl -name <Name> -mnesia dir <Dir>
or in a "config" file, which is identified with the parameter 'config'
erl -name <Name> -config <ConfFile>
For various reasons, the file should be named sys.config, and has the
following format:
[{AppName1, [{EnvVar, Val}]}].
For example:
[{mnesia, [{dir, "/home/joe/test/mnesia.n1"},
{embedded_mnemnosyne, false}]},
{kernel, [{start_ddll, true},
{start_disk_log, true}]}].
Setting the environment variables programmatically *can* be done, but
you have to use an internal function in the application_controller:
application_controller:set_env(AppName, Key, Value)
It is not recommended, and you will not find the function in any manual.
What I do is that I generate the sys.config file programmatically during
an installation phase. I don't think it's such a good idea to be
changing those variables in a running system anyway - better to create a
static configuration and then start the erlang node from it.
/Uffe
--
Ulf Wiger, Chief Designer AXD 301 <ulf.wiger@REDACTED>
Ericsson Telecom AB tfn: +46 8 719 81 95
Varuvägen 9, Älvsjö mob: +46 70 519 81 95
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