CN105404701A - Peer-to-peer network-based heterogeneous database synchronization method - Google Patents

Peer-to-peer network-based heterogeneous database synchronization method Download PDF

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Publication number
CN105404701A
CN105404701A CN201511032925.5A CN201511032925A CN105404701A CN 105404701 A CN105404701 A CN 105404701A CN 201511032925 A CN201511032925 A CN 201511032925A CN 105404701 A CN105404701 A CN 105404701A
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information
database
block
node
timestamp
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CN105404701B (en
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王斌
孙建祖
来亦子
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Zhejiang Iopinfo Technology Co Ltd
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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F16/00—Information retrieval; Database structures therefor; File system structures therefor
    • G06F16/20—Information retrieval; Database structures therefor; File system structures therefor of structured data, e.g. relational data
    • G06F16/27—Replication, distribution or synchronisation of data between databases or within a distributed database system; Distributed database system architectures therefor
    • G06F16/273—Asynchronous replication or reconciliation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L67/00—Network arrangements or protocols for supporting network services or applications
    • H04L67/01—Protocols
    • H04L67/10—Protocols in which an application is distributed across nodes in the network
    • H04L67/1095—Replication or mirroring of data, e.g. scheduling or transport for data synchronisation between network nodes

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  • Databases & Information Systems (AREA)
  • Theoretical Computer Science (AREA)
  • Computing Systems (AREA)
  • Data Mining & Analysis (AREA)
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  • General Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Computer Networks & Wireless Communication (AREA)
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  • Information Retrieval, Db Structures And Fs Structures Therefor (AREA)
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Abstract

The invention discloses a peer-to-peer network-based heterogeneous database synchronization method. The method is realized based on a heterogeneous database synchronization device composed of routing nodes and a global proxy server. The method comprises the steps of detecting the information charging condition of a database, feeding back the information changing condition to the global proxy server, broadcasting the changed information to the routing proxies of all nodes by the global proxy server, updating the resource information of each node, recording the timestamp of the updated information, updating the recorded timestamp in a block chain, updating the proxy synchronization state of each node, recording the timestamp thereof and the-be-changed information, and feeding back the updating state to a global proxy. According to the invention, through the decentration process, the self-management of each node is realized. Therefore, the reliability and the usability of database synchronization are greatly improved. The above method is conducted based on the block chain technology and enables the complete data exchange record. Meanwhile, the problem in the prior art that the data exchange in the traditional goal-centered approach cannot be traced is solved.

Description

A kind of heterogeneous database synchronization method based on peer-to-peer network
Technical field
The invention belongs to infotech neighborhood, particularly relate to a kind of heterogeneous database synchronization method based on peer-to-peer network.
Background technology
Be with rapid changepl. never-ending changes and improvements in the development concerning people's infotech, a lot of Information System configuration in different times, and is designed by different manufacturers again separately, makes the platform of these systems often present isomerism, result in the inconsistency of data.If data message can not get effectively sharing, so these independently data system will become one by one " information island "; In addition, along with improving constantly of the flourish of business event and the level of informatization, exchanges data between each application system is also day by day frequent, can bring such problem: different platform, and the demand that the data source of different-format carries out exchanges data and data syn-chronization is more and more extensive.But in exchanges data, owing to there is no exchanges data and the synchronization means of standard, exchanges data be realized very difficult with synchronous.Therefore enterprise urgently wishes the data in each information integrated, and eliminate " information island ", between guarantee information system, message exchange is unimpeded, ensures consistance and the security of data transmission, really realizes data sharing.For this reason, how to process the information in these heterogeneous databases flexibly and effectively, realizing heterogeneous database synchronizing information becomes quite concerned studying a question.
Each node that the isomerism of heterogeneous database system is mainly reflected in Database Systems adopts incomplete same hardware platform, operating system and Database Systems, can be summarized as these three aspects of isomery of the isomery of Computer Architecture, the isomery of operating system and DBMS.
Each database participated in operates in the isomery being referred to as Computer Architecture in the computing machine of large scale computer, minicomputer, workstation, PC or these different architecture of embedded system respectively.
Each Database Systems run on Unix, are counted as the isomery of underlying Operating System in the operating system that WindowsNT, Linux etc. are different.
The isomery of DBMS can be divided into two kinds according to database model: be a kind ofly by several different database such as Oracle, SQLServer but be all system R and form; Another kind is by the database of different pieces of information model, as the heterogeneous database system that relation, pattern, level, network, object-oriented, function type database form jointly.The difference of DBMS is mainly manifested in expression structure and restriction and these two aspects semantic.Expression structure and restriction aspect: different data models provides different structure primitive, such as identical information uses relationship expression in relational model, and expresses by record type in network model; Different data models may support different restrictions, the database language that different data models is usually corresponding different, even if data model is identical also can have different language.Data semantic aspect: comprise mathematical logic and represent and database interoperability two aspect, wherein mathematical logic represents and relates to used data pattern and data type etc.
When the defect of current synchronous method is that hardware, network or database break down, the reliabilty and availability of database in phase can not be ensured.
Chinese invention patent (publication number 102063502A) discloses a kind of method realizing synchronization of data in heterogeneous database.Wherein heterogeneous database comprises database A and database B, and database A is that user applies used database, and database access interface uses JDBC interface, and database B is the destination data storehouse of carrying out data syn-chronization; The JDBC also comprising the JDBC driving bag and B that the JDBC meeting SUN specification drives AB, described driving AB to comprise A drives bag; All driven by the JDBC that former state passes to database A the function call driven on AB, and database is had to the function call of change, then after sql grammer Mapping and Converting, then the JDBC passing to database B drives.The shortcoming of the method is: when a certain database breaks down, heterogeneous database synchronization method can lose efficacy.
Chinese invention patent (publication number 102129478A) discloses a kind of database synchronization method and system.The method comprises: catch in real time the change information of data in source database and affairs corresponding to this data variation, and be saved in intermediate database by the change information captured and affairs; Determine to need synchronous target database according to the change information preserved in intermediate database; Described change information is converted to the target data of corresponding described target database; All target datas of same for correspondence affairs are updated in described target database simultaneously.Utilize the present invention, the data syn-chronization between dissimilar database and heterogeneous data table can be realized, reduce synchronizing process to the consumption of system resource, ensure the reliability of synchronizing process.The shortcoming of the method is: when hardware or network failure, can not solve the consistance of source database and target database.
Summary of the invention
The object of the invention is to for the deficiencies in the prior art, a kind of heterogeneous database synchronization method based on peer-to-peer network is provided, each server entity of database synchronization is all reciprocity, be informant and taker, sharing of information resources is realized by directly interconnected between node, and without the need to relying on the support of centralized server.
Block chain be a string method that accesses to your password be associated produce data block, contain the information of a bit coin network trading in each data block, for verify its information validity (false proof) and generation next block.The inventive method by block chain technology, database of record modification information, simultaneously logging timestamp, the block chain that on network, each node maintenance is unified.
Heterogeneous database synchronization method provided by the invention, comprises the following steps:
(1) database information changes, and feeds back to overall agency service;
(2) overall agency service gives the information broadcasting changed the route agent in each node; Each database information change record, must be broadcast to all nodes of overall proxy management;
(3) by overall proxy server, the resource information of each node is upgraded; By the information logging timestamp upgraded, and be updated in block chain;
Overall situation proxy server is implemented random hash to exist in block form one group of data and is added timestamp, is broadcasted by this random hash; Each timestamp should include previous timestamp in its random hash value, and each timestamp subsequently strengthens timestamp before, so just defines block chain.
(4) the proxy isochronous state of each node is upgraded, logging timestamp and information to be changed, and upgrading feedback of status to overall situation agency: the modification information received is included in a block by each node, if and only if all modification informations be included in this block are all effective and did not exist before, and other nodes just admit the validity of this block; Other nodes represent and accept this block, simultaneously at the end of following this block, generate new block to extend this block chain, and will be accepted the random hash value of hashed value as new block of block.
Heterogeneous database synchronous device provided by the invention is as follows:
Under this device section is deployed in LAN environment, a routing node of the corresponding Agent layer of each database, the information of this routing node monitoring correspondence database changes; The state of each node of overall situation agency service record, the block chain that maintenance data base changes.
(1) routing node: whether monitor database changes, if change, notifies overall agency service.
(2) overall agency service: overall agency service informs the message bag of databases comparison each routing node in network.
The invention has the beneficial effects as follows:
1, The present invention gives a kind of heterogeneous database synchronous device, by decentralization, each node self-management, can promote the reliabilty and availability of database synchronization greatly.
2, The present invention gives a kind of peer-to-peer network method, and based on block chain technology, have complete exchanges data record, solve can not reviewing of the exchanges data of conventional center pattern.
Accompanying drawing explanation
Fig. 1 is heterogeneous database synchronization method process flow diagram of the present invention;
Fig. 2 is heterogeneous database synchronous device schematic diagram of the present invention.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
Be illustrated in fig. 1 shown below, heterogeneous database synchronization method provided by the invention, comprises the following steps:
(1) database information changes, and feeds back to overall agency service
The block node structure that each database information changes is as follows:
Data item Lexical or textual analysis
Version Block version number
Previousblockhash 256 HASH values of last block
Nextblockhash 256 HASH values of a rear block
Merkleroot Based on 256 HASH values of All Activity in a block
Time Timestamp
Bits The current goal HASH value of compressed format
Confirmations The confirmation number that in block, data change
Contents Changed content
(2) overall agency service is broadcast to modification information the route agent in each node: each database information change record, must be broadcast to all nodes of overall proxy management.
(3) by overall situation agency, the resource information of each node is upgraded: by the information logging timestamp upgraded, and be updated in block chain.Block chain, be a list structure, block node structure is the node information of block chain.
(4) synchronous regime of each node is upgraded, and logging timestamp and resource to be updated, give overall situation agency renewal feedback of status; If the synchronizing information success of node, then synchronous regime is 1, otherwise is 0; Each node maintenance block chain information, when the block chain information of node is imperfect, waits next overall agency service notice renewal rewards theory, after the block chain of node needs synchronously to complete, then carries out next renewal rewards theory.
As shown in Figure 2, heterogeneous database synchronous device provided by the invention is as follows:
Under this device section is deployed in LAN environment, a routing node of the corresponding Agent layer of each database, the information of this routing node monitoring correspondence database changes; The state of each node of overall situation agency service record, the block chain that maintenance data base changes.
(1) routing node: whether monitor database changes, if change, notifies overall agency service.
(2) overall agency service: overall agency service informs the message bag of databases comparison each routing node in network.

Claims (1)

1. based on a heterogeneous database synchronization method for peer-to-peer network, it is characterized in that, the method realizes on heterogeneous database synchronous device, under this device section is deployed in LAN environment, comprises routing node and overall agency service; A routing node of the corresponding Agent layer of each database, the information of this routing node monitoring correspondence database changes; The state of each node of overall situation agency service record, the block chain that maintenance data base changes; The method comprises the following steps:
(1) database information changes, and feeds back to overall agency service;
(2) overall agency service gives the information broadcasting changed the route agent in each node; Each database information change record, must be broadcast to all nodes of overall proxy management;
(3) by overall proxy server, upgrade the resource information of each node, by the information logging timestamp upgraded, and be updated in block chain: overall proxy server is implemented random hash to exist in block form one group of data and added timestamp, is broadcasted by this random hash; Each timestamp should include previous timestamp in its random hash value, and each timestamp subsequently strengthens timestamp before, so just defines block chain;
(4) the proxy isochronous state of each node is upgraded, logging timestamp and information to be changed, and upgrading feedback of status to overall situation agency: the modification information received is included in a block by each node, if and only if all modification informations be included in this block are all effective and did not exist before, and other nodes just admit the validity of this block; Other nodes represent and accept this block, simultaneously at the end of following this block, generate new block to extend this block chain, and will be accepted the random hash value of hashed value as new block of block.
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