Abstract: This application relates to apparatus and methods for maintaining a database. In some examples, a processor receives a request for a first dataset that includes a definition. In response to obtaining the first audience dataset from a database, the processor automatically re-generates the first dataset when a first predetermined time period has elapsed. The first dataset includes a first segment dataset. The processor automatically re-generates the first segment dataset when a second predetermined time period has elapsed. The first segment dataset includes a first dynamic feature dataset. The processor automatically re-generates the first dynamic feature dataset when a third predetermined time period has elapsed. After updating the first dataset (and/or subcomponents thereof), the processor transmits the first dataset to a requesting device.

Abstract: This application relates to apparatus and methods for identifying and generating audiences. In some examples, a computing device obtains data identifying users and related attributes. The computing device generates static features and dynamic segments based on the data. The computing device obtains an audience definition for an audience, and determines any required static features, dynamic segments, and segments. The computing device determines if any of the required segments need to be generated. To determine whether a segment is to be regenerated, the computing device may determine how much time has elapsed since the last time the segment was generated. The computing device may regenerate segments based on static data less often than segments based on dynamic data. To generate the audience, the computing device applies the audience definition to the required static features, dynamic segments, and segments.