International Business Machines Corporation

Normen Seemann

Edison Lao Ting

Tuong Chanh Truong

Tian Zhang

Anjali Betawadkar-Norwood

Mayank Pradhan

Radhika Reddy

Kevin Scott Beyer

Roberta Jo Cochrane

Fatma Ozcan

Embodiments are included for methods, systems, and computer program products in which evaluating operations using an electronic computing device are presented including: receiving the operation on a first database partition in a shared nothing parallelism system, where the operation is non-collocated, reference based operation; generating a correlation sequence, where the correlation sequence includes a sequence of references pointing to input data required for the operation; receiving one of the references on a first table queue operator on a second database partition, where the second database partition includes input data corresponding with the received reference, and where the table queue operator is configured for providing communication between the first database partition and the second database partition; and processing the input data on the second database partition corresponding with the operation.

Evaluating reference based operations in shared nothing parallelism systems

Embodiments are included for methods, systems, and computer program products for evaluating operations in a shared nothing parallelism system using an electronic computing device are presented, the methods and computer program products including: causing the electronic computing device to receive the operation, where the operation is non-collocated, reference based operation, and where the operation is configured for execution on a first partition in the shared nothing parallelism system; causing the electronic computing device to insert a table queue operator on a second partition, where the second partition includes a reference to input data, causing the electronic computing device to place the reference to the input data on the first partition by the table queue operator; and causing the electronic computing device to execute the operation on the reference to the input data on the first partition.

A system and method is provided for XML query processing includes an execution compiler for transforming an XML query into an executable XML query plan. A query rewrite processor performs query transformation on the XML query, the query transformations including transforming an XPath within said XML Query into a pre-filter. The XML query is then transformed into a transformed XML query which includes the pre-filter.

Creation of pre-filters for more efficient X-path processing

An XML query compilation processor () includes an execution compiler () that transforms an XML query into an executable XML query plan (). A query rewrite processor () performs query transformations on the XML query. Said query transformations include transforming an expression input () received by an expression () conditional upon a set of items defined by an output () of the expression () being independent of grouping of items in the expression input ().

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San Francisco, CA, United States of America

Normen Seemann