International Business Machines Corporation

Kyungpook National University Industry-academic Cooperation Foundation

Wook-Shin Han

Guy Maring Lohman

Lucian Popa

Ching-Tien Ho

Wooseong Kwak

Jinsoo Lee

Haifeng Jiang

Volker Markl

A computer-implemented method for use with an extensible markup language (XML) document includes inputting a high-level mapping specification for a schema mapping; and generating a target XML document based on the mapping. The method may perform schema mapping-based XML transformation as a three-phase process comprising tuple extraction, XML-fragment generation, and data merging. The tuple extraction phase may be adapted to handle streamed XML data (as well as stored/indexed XML data). The data merging phase may use a hybrid method that can dynamically switch between main memory-based and disk-based algorithms based on the size of the XML data to be merged.

Scalable algorithms for mapping-based XML transformation

A computer program product that includes a computer useable storage medium to store a computer readable program that, when executed on a computer, causes the computer to perform operations, including operations to receive a query for which a query execution plan (QEP) is to be computed, divide a search space into a plurality of subproblems for which constituent QEPs are to be created, partition the plurality of subproblems into a plurality of partitions, and allocate each of the plurality of partitions to a thread of a plurality of threads within a multiple thread architecture. Possible QEPs describe a search space. Each subproblem references one or more quantifiers and each of the subproblems within a partition references the same number of quantifiers. A partition containing subproblems referencing fewer quantifiers is executed before a partition containing subproblems referencing more quantifiers.

System, method, and apparatus for parallelizing query optimization

Growing community of inventors

Daegu, South Korea

Wook-Shin Han