The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 26, 2018
Filed:
Mar. 27, 2015
Nec Corporation, Tokyo, JP;
Youhei Sasaki, Tokyo, JP;
NEC CORPORATION, Tokyo, JP;
Abstract
A KV data storage part stores a plurality of key value data each being a pair of key and value. The value contains a record of tabular data. The key contains part of column values of the record. A WAL storage part stores an update history of a data group. The data group includes a plurality of KV data referred to and updated by one transaction. The update history has information of a data manipulation instruction in the transaction and the record changed through processing according to the data manipulation instruction. A transaction processor, in commit of the transaction, determines the presence or absence of exclusion violation per record on a basis of the update history stored in the WAL storage part and, if exclusion violation is absent, makes the transaction succeed and records the update history relating to the transaction into the WAL storage part.