A "corpus period", "internal subcorpus" or a "search period" is a break, which is introduced to restrict the memory usage. Corpus period always coincides with a file break. The size of one corpus period is 5000000 by default and can be determined manualy using field "UserMaxTokenCountInOnePeriod" in the options file. While evaluating a query DDC deals only with one corpus period at a time, so DDC applies the input query to each corpus period, and then concatenates the results. Corpus periods are also used in storing period divisions
1.7.1