发明名称 |
Maintained Symbol Table Only Index |
摘要 |
A method, apparatus and program product is provided for optimizing a database query. A query syntax, system generated predicates, and requisite statistics of the database query are analyzed to determine if a predicate structure is a good candidate for a symbol table only data structure. The predicate structure is analyzed to determine if the predicate structure is already encompassed by an encoded vector index. The symbol table only data structure is generated for at least one column in a database table without generating a corresponding vector data structure from an encoded vector index if the predicate structure is a good candidate and not encompassed by an encoded vector index. The symbol table only data structure is maintained by detecting a change in data associated with the symbol table only data structure and updating the symbol table only data structure to reflect the change in the data.
|
申请公布号 |
US2009182720(A1) |
申请公布日期 |
2009.07.16 |
申请号 |
US20080014562 |
申请日期 |
2008.01.15 |
申请人 |
CAIN MICHAEL W;FAUNCE MICHAEL S;HU WEI;KETHIREDDY SHANTAN;PASSE ANDREW PETER;THIEMANN ULRICH |
发明人 |
CAIN MICHAEL W.;FAUNCE MICHAEL S.;HU WEI;KETHIREDDY SHANTAN;PASSE ANDREW PETER;THIEMANN ULRICH |
分类号 |
G06F17/30 |
主分类号 |
G06F17/30 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|