Ok, first let me recommend that you upgrade your MaxDB to a recent 7.8.02 version (albeit unrelated to your current question).
Regarding the Database Analyzer message, this is rather a 'warning' than an 'error' message.
It means that you have SQL queries with pretty bad 'selectivity' - this is the rlation between rows returned by the query and the rows the database needed to read to obtain that result.
If you are concerned about this, try to identify the running SQL statements and try to improve them or create a new index, if needed. For identifying the SQL, you can use the 'Command/Resource Monitor' (or - I think - in MaxDB 7.9 only, look at the Database Analyzer 'Running_Commands' file).
Thorsten