Methods, systems and apparatus, including computer program products, for enhancing query performance through fixed length hashing of multidimensional data. According to one method, a fixed length hash of a multidimensional data record is created where the hash has respective fixed length sections for each data dimension of the record being hashed. The composite fixed length hash is stored with a reference to the original data record to which it corresponds. Query parameters are hashed and compared to a corresponding section of the fixed length hash to determine a set of candidate records.