Rewrite of queries containing rank or rownumber or Min/Max...

Data processing: database and file management or data structures – Database and file access – Query optimization

Reexamination Certificate

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Reexamination Certificate

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07912834

ABSTRACT:
Techniques are provided for improving efficiency of database systems, and in particular, to refreshing materialized views maintained by database systems and rewriting queries to access the materialized views. According to the approaches, a ranked materialized view is incrementally refreshed, and during the incremental refresh operation, rows in the partitions of the materialized view are ranked within the partitions.

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