Before you can use LightDB you need to install it, of course. It is possible that LightDB is already installed at your site, either because it was included in your operating system distribution or because the system administrator already installed it. If that is the case, you should obtain information from the operating system documentation or your system administrator about how to access LightDB.

If you are not sure whether LightDB is already available or whether you can use it for your experimentation then you can install it yourself. Doing so is not hard and it can be a good exercise. LightDB can be installed by any unprivileged user; no superuser (root) access is required.

If your site administrator has not set things up in the default way, you might have some more work to do. For example, if the database server machine is a remote machine, you will need to set the LTHOST environment variable to the name of the database server machine. The environment variable LTPORT might also have to be set. The bottom line is this: if you try to start an application program and it complains that it cannot connect to the database, you should consult your site administrator or, if that is you, the documentation to make sure that your environment is properly set up. If you did not understand the preceding paragraph then read the next section.