How should i create a user that has a limited access to all my surveys or some of them without granting Superadmin rights?
For example: he can get statistics and cannot change, create or delete anything.

Till today I have been the only user and admin of my LimeSurvey, but today my boss asked me to grant him limited access to the the data base to check answers and statistics. I do not really want to grant him Super admin rights, as he may accidentally delete something or e-mail tokens. My boss is not smart enough to get how it works and i am aware of security issue.

Is he smart enough to read this?

You can't give him these types of permissions globally but you can add him as a user to each of your surveys and give him the appropriate permissions for that survey:

Survey properties --> Survey permissions

Thank you. That's what i really need. He is not smart enough to read this. Big bosses need only the results of your work. Most of the time they do not bother about how you manage and of coarse they do not visit special support forums of very special program products. As for my boss his english is poor and he is bad in computers. And the last but not the least - Dominik is not a real name

More information:

Global user rights: docs.limesurvey.org/Manage+users&structu...tions+for+LimeSurvey

Survey based user rights: docs.limesurvey.org/Survey+security+sett...tions+for+LimeSurvey