Matching up XML query expression for XML table index lookup...

Details Matching up XML query expression for XML table index lookup... Matching up XML query expression for XML table index lookup...

2011-01-11

2011-01-11

Nguyen, Cam-Linh (Department: 2161)

Data processing: database and file management or data structures

Database and file access

Query optimization

Reexamination Certificate

active

07870121

ABSTRACT:
Techniques are provided for determining whether an XML table index may be used when executing an XML query. An XML table index is defined with a row pattern expression and one or more column pattern expressions. In one technique, an index expression is generated for each row pattern expression-column pattern expression combination. An expression included in the XML query (“query expression”) is compared against one or more of the index expressions. In another technique, even if a query expression does not exactly match a row pattern expression, it is determined whether the query expression is equivalent to the row pattern expression. In another technique, even if a query expression does not exactly match and a row pattern expression, it is determined whether the query expression is “contained by” the row pattern expression.

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