Abstract: The instant invention relates to a method of and an apparatus for determining a set of large sequences from an electronic data base comprising a set D={d1, . . . , dn} of transactions di (1?i?n) in a computer system with an implemented query module, each of the large sequences on the set D of transactions di having a support value greater than or equal to a given support value S, each of the transactions di of the set D being a sequence of items of a record E={e1, . . . , em} of items ej (1?j?m). A set Lk (k>2) of large sequences is determined from the set D of transactions, the large sequences of set Lk each comprising exactly k items of record E in a respective order RLK, and an associated support value SLK on the sequence D of transactions each being greater than or equal to the given support value S, and nothing but sequences comprising two of the large sequences of set Lk?1, as partly overlapping partial sequences, with the respective order RLK?1, being taken into account in determining set Lk.

Abstract: The instant invention relates to a method of and an apparatus for determining a set of large sequences from an electronic data base comprising a set D={d1, . . . , dn} of transactions di (1≦i≦n) in a computer system with an implemented query module, each of the large sequences on the set D of transactions di having a support value greater than or equal to a given support value S, each of the transactions di of the set D being a sequence of items of a record E={e1, . . . , em} of items ej (1≦j≦m).