Database synchronization system and method
First Claim
1. A database synchronization system for synchronizing data of databases of a first apparatus and a second apparatus connected to each other through a network, comprising:
- first differential information update notification means provided in said first apparatus for extracting only differential information of said database of said first apparatus and issuing a notification of the differential information to said second apparatus;
second differential information update notification means provided in said second apparatus for extracting only differential information of said database of said second apparatus and issuing a notification of the differential information to said first apparatus;
a power supply for said second apparatus;
a data buffer for receiving the differential information transmitted from said first differential information update notification means, temporarily storing the received differential information and transferring the stored differential information to said second apparatus; and
power supply control means for controlling said power supply for said second apparatus when the differential information from said first differential information update notification means is stored into said data buffer.
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Accused Products
Abstract
A synchronization system and method for databases by which the immediacy of synchronization between the databases can be assured without dialup connection and the power supply to an information terminal need not always be on to keep the information terminal in a standby state is disclosed. The database synchronization system synchronizes data of databases of an application server and an information terminal connected to each other through a network. A first database information update notification section provided in the application server extracts only differential information of the database of the application server and issues a notification of the differential information to the information terminal. A second database information update notification section provided in the information terminal extracts only differential information of the database of the information terminal and issues a notification of the differential information to the application server. A data buffer receives the differential information transmitted from the first database information update notification section, temporarily stores the received differential information and transfers the stored differential information to the information terminal. A power supply control section controls a power supply for the information terminal when the differential information from the first database information update notification section is stored into the data buffer.
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Citations
9 Claims
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1. A database synchronization system for synchronizing data of databases of a first apparatus and a second apparatus connected to each other through a network, comprising:
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first differential information update notification means provided in said first apparatus for extracting only differential information of said database of said first apparatus and issuing a notification of the differential information to said second apparatus;
second differential information update notification means provided in said second apparatus for extracting only differential information of said database of said second apparatus and issuing a notification of the differential information to said first apparatus;
a power supply for said second apparatus;
a data buffer for receiving the differential information transmitted from said first differential information update notification means, temporarily storing the received differential information and transferring the stored differential information to said second apparatus; and
power supply control means for controlling said power supply for said second apparatus when the differential information from said first differential information update notification means is stored into said data buffer. - View Dependent Claims (2, 3, 4, 5, 7)
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6. A data base synchronization system as claimed in claim 6, wherein said power supply control means controls said power supply for said second apparatus to an off state when update of said database of said second apparatus is completed.
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8. A database synchronization method for synchronizing data of databases of a first apparatus and a second apparatus connected to each other through a network, comprising the steps of;
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storing, when differential information of said database of said first apparatus is transmitted from said first apparatus to said second apparatus while said power supply for said second apparatus is off, the differential information into a data buffer of a packet communication apparatus on said first apparatus side;
controlling said power supply for said second apparatus to an off state by power supply control means of said packet communication apparatus; and
transferring the differential information of said data buffer to said second apparatus and updating said database of said second apparatus. - View Dependent Claims (9)
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Specification