Nec Corporation

Tomoo Ebiyama

Junpei Kamimura

Atsushi Kitazawa

The transaction processing apparatus () includes: a transaction analyzer () that determines whether or not a transaction is a transaction that acquires a lock to operate and specifies, on a data storage device (), data that is to be accessed by the transaction; a lock manager () that causes, if the transaction acquires a lock to operate, this transaction to acquire the lock; and a transaction executor () that executes this transaction on the condition that another transaction other than this transaction has not acquired the lock, and updates, based on the execution result, the data that is to be accessed.

Transaction processing apparatus, transaction processing method, and computer-readable recording medium

An information storage system includes: a data storing unit storing key value data in which a key is one of a plurality of elements of record data composed of the elements and the key is associated with a value including one or a plurality of record data; and a data structure converting unit converting a data structure of the key value data stored by the data storing unit into another data structure by changing the key. The data structure converting unit performs conversion of the data structure of the key value data stored by the data storing unit in accordance with a use condition of the key value data.

Information storage system

A transaction processing device including: a representative key decision portion for deciding a representative key to be any one of the keys of every record of a record group as an object for maintaining consistency in a transaction process; a log compilation portion for updating a subordinate log by adding consistence object information indicating the object for maintaining the consistency to the subordinate log other than a representative log corresponding to the representative key among the logs corresponding to every record of the record group; a log update portion for updating the representative log by writing update information for every record of the record group into the representative log; and a record update portion for updating every record by reflecting the update information written into the representative log in the every record of the record group.

Growing community of inventors

Tokyo, Japan

Tomoo Ebiyama