Invention Grant
- Patent Title: Predicate result cache
- Patent Title (中): 谓词结果缓存
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Application No.: US13631434Application Date: 2012-09-28
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Publication No.: US08812523B2Publication Date: 2014-08-19
- Inventor: Vineet Marwah , Teck Hua Lee , Amit Ganesh
- Applicant: Oracle International Corporation
- Applicant Address: US CA Redwood Shores
- Assignee: Oracle International Corporation
- Current Assignee: Oracle International Corporation
- Current Assignee Address: US CA Redwood Shores
- Agency: Hickman Palermo Truong Becker Bingham Wong LLP
- Main IPC: G06F7/00
- IPC: G06F7/00

Abstract:
In token compression, a column value is represented by a encoded token. During early predicate evaluation, the result that a decoded token in a column does not satisfy a predicate condition in a predicate conjunction is recorded in a cache as a “FALSE”. Such a result not only means that when the column contains that token that the predicate condition is not satisfied, but also that a predicate conjunction containing the predicate condition is not satisfied. When performing early predicate evaluation on a subsequent row on a token in a column, the conjunction result cache is referred to. If the cache records a FALSE for that token in that column, then it is known the predicate conjunction cannot be satisfied by the decoded token.
Public/Granted literature
- US20140095517A1 PREDICATE RESULT CACHE Public/Granted day:2014-04-03
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