Now, to not use login and password to log in into mysql you can create on every machine file ~/.my.cnf with content:

[client]
user = mysql_user_login
password = here_goes_password
host = localhost

After that you after command ‘mysql’ you will be authenticated automagically.

To perform actions in parallel you can use ‘pssh’ package – can be found at http://www.theether.org/pssh/ or in Debian repository.

If you are afraid login via ssh without password you can create a key with passphrase and configure ssh-agent to put the right passphrase on every login.

Alternatively to perform parallel actions you can use cluster ssh software (cssh). It is written in tcl/tk and you can see several terminals at once and run commands simultaneously.

In MS Windows environment there is an excellent Putty Connection Manager. You can define several putty connections and run it in the grid. Then as in cssh you can use built-in multi command sender.

We don’t support the use of MySQL variables within a statement. Thus using @tot will force execution by the MySQL query engine, which negates the benefits you get from the Knowledge Grid. You can disable the MySQL Query Path in the latest releases of Infobright which will save you having to wait, and ultimately abort the query.

Hope this helps,
Mark