A BSTRA CTA new method for multikey access suitable for dyna mic files is proposed that transforms multiple key values into a logical address. This method is based on a new structure, called predicate tree, that represents the function applied to several keys. A predicate tree permits to specify in a unified way various hashing schemes by allowing for diffe rent definitions of predicates. A logical address qualifies a space partition of a file according to its predicate tree. This address is seen as a sin gle key by a digital hashing method which trans forms it into a physical address. This method is used to address records in a file and to transform a retrieval qualification on a file into a set of partitions to access. Finally, a qualitative ana lysis of the behavior of the method is given which exhibits its value.
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