Value limits for list dimensions

Total

A whitelist or blacklist may contain up to 50,000 total values.

Hourly

By default, Discover limits the number of unique values that are recorded for a dimension per hour. Suppose you capture 110 unique values in a given hour and configured the dimension to capture 100 unique values per hour. The last 10 captured values are assigned the [Limit] value.

  • Dimension limits are enforced on an hourly basis per Processing Server.
  • When a dimension limit is reached, an error is reported in the Event Log:
    
    Dimension ID = XXX has surpassed its hourly limit of YYY values
    
    
  • Dimension values can be up to 255 characters. Longer dimension values are truncated at 255 characters.

For blacklist dimensions: The Max Values per Hour setting is enforced for values outside of the blacklist, which does not include the configured Default Value for the dimension.

  • Fixed whitelist dimensions: No hourly limit is imposed on these dimensions, but any captured value must appear in the whitelist. Otherwise, the value is substituted by the specified default value.
  • Non-fixed whitelist dimensions: The Max Values per Hour setting is enforced. It is discounted by the size of the whitelist. The number of permitted unique values is the following:
    
    MaxPerHour - <items in whitelist>
    
    

Under Advanced Options in the Add or Edit Dimension dialog, you can configure the maximum values that are captured per hour and the default value for the dimension. Increasing the number of dimensional values that are captured per hour requires extra storage space in the database. See Creating or editing a dimension.