All of the historical monitoring data files for a given recording session are stored in the same directory. This directory is, by default, the directory specified by the -D parameter to the Historical Server start-up command. You can override this default for a session when you create the session.
The user who starts Historical Server is the owner of the files that Historical Server creates. The owner has read and write permission on the historical monitoring files. If the data contained in an historical data file or error message file is public rather than private, all users and groups have read permission.