It is not an error to append if the table does not already exist; in this situation the parameter's value is irrelevent.
The range is 1 to the SelectRowsLimit configuration value (100000 by default). This should be specified only if Append is true. There is no limit when overwriting.
A simple example.
The method overwrites whatever was previously in the table. If you want to accumulate data by appending, these show examples of a task that would be run periodically to record who is logged on at that time. They also return the accumulated data.
See User Defined Persistent Storage page for guidance using persistent storage tables.
The following methods exist in the Agent Storage module: