Queries with soft time constraints

Details Queries with soft time constraints Queries with soft time constraints

2011-05-31

2011-05-31

Kim, Charles (Department: 2157)

Data processing: database and file management or data structures

Database and file access

Query optimization

C707S720000

Reexamination Certificate

active

07953728

ABSTRACT:
Systems, methodologies, media, and other embodiments associated with supporting queries with soft time constraints are described. One exemplary system embodiment includes logic for accepting a query having a soft time constraint. The example system may also include logic for rewriting the query having the soft time constraint into a query having a row limitation or a sample percentage limitation. In one example, the row limitation or sample percentage limitation are computed by repetitively comparing an estimated query execution time to the soft time constraint.

REFERENCES:
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Lee et al. (Proceedings of the fifth international conference on Information and knowledge management, Nov. 1996, pp. 279-287).
Hu et al, “Supporting Time-Constrained SQL Queries in Oracle, Proceedings of the 33rd international conference on Very large data bases, 2007”.
US Non-Final Office Action in co-pending U.S. Appl. No. 11/804,508, filed May 18, 2007 having a Notification Date of Jun. 12, 2009.
Hou et al. (ACM SIGMOD vol. 18, Issue 2, Jun. 1989, pp. 68-77).
US Final Office Action in co-pending U.S. Appl. No. 11/804,508, filed May 18, 2007 having a Notification Date of Dec. 18, 2009.

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