Database system, computer program product, and data processing method
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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Jun 16, 2020
Grant Date -
Jun 9, 2016
app pub date -
Feb 18, 2016
filing date -
Aug 21, 2013
priority date (Note) -
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Abstract
According to an embodiment, a database system includes nodes and a management device. The management device includes first and second assigning units. Depending on change in state of each node, the first assigning unit assigns a first node storing data pieces and receiving an access request to the data pieces, and assigns a second node serving as a backup node, and instructs each node to perform operations according to assignment. Depending on state of nodes and change in assignment state, the second assigning unit assigns a third node as a candidate node serving as the first node, and instructs each node to make preparation for causing the third node to operate as the first node. Each node sends, to the third node, a snapshot of the data pieces at the first time point and an operation log according to the access request at and after the first time point.
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