How can I safelly erase (with rm command in Linux) files or dirs concerning a specific database ?
Using 'rm', you can't -- not safely anyways.
assuming I whish to elimiante data belonging to database A but I do not whish to disturb or cause any injury to database B
Login to database B and type: 'DROP DATABASE A;' That will drop the whole database. If you just want to delete certain tables within the database, then you should login to database A and use: 'DROP TABLE tablename'
Is there documentation on how to do this or on what exactly am I erasing if I remove some specific file or dir.