The present invention relates to a method for reducing a data repository with a plurality of sequentially ordered records. Each record is characterized by an identifier and comprises one or more data attributes and/or one or more links. The method includes the step of choosing a first record as base record and verifying whether the identifier of the sequentially next record can be generated from the base record by applying an identifier generating function. As a next step it is verified whether the data attributes and/or the links of the sequentially next record are identical with the data attributes and/or the links of the base record or can be generated from the base record by applying an attribute generating function and/or link generating function. If the above conditions are satisfied, a counter in the base record is incremented and the sequentially next record is deleted. The above steps are repeated for the subsequent records until the above conditions and are not satisfied for any record.