CA2447821A1 - Synchronization of database data - Google Patents

Synchronization of database data Download PDF

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Publication number
CA2447821A1
CA2447821A1 CA002447821A CA2447821A CA2447821A1 CA 2447821 A1 CA2447821 A1 CA 2447821A1 CA 002447821 A CA002447821 A CA 002447821A CA 2447821 A CA2447821 A CA 2447821A CA 2447821 A1 CA2447821 A1 CA 2447821A1
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Canada
Prior art keywords
update identifier
synchronization
update
stored
identifier
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Granted
Application number
CA002447821A
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French (fr)
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CA2447821C (en
Inventor
Ari Sutinen
Riku Mettala
Jussi Piispanen
Mikko Sahinoja
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Nokia Technologies Oy
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Individual
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Publication of CA2447821A1 publication Critical patent/CA2447821A1/en
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Publication of CA2447821C publication Critical patent/CA2447821C/en
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Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • G06F16/275—Synchronous replication
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S707/00—Data processing: database and file management or data structures
    • Y10S707/99931—Database or file accessing
    • Y10S707/99938—Concurrency, e.g. lock management in shared database
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S707/00—Data processing: database and file management or data structures
    • Y10S707/99951—File or database maintenance
    • Y10S707/99952—Coherency, e.g. same view to multiple users

Abstract

A method of arranging synchronization of databases, the method comprising th e steps of establishing a transport layer connection for synchronization betwe en a first and a second device which synchronize databases. During initializati on of synchronization a first update identifier, which is stored at least in th e first device and describes the latest synchronization event the devices have performed in the databases, and a second update identifier, which is defined by the first device and describes the present synchronization, are transmitt ed from the first device to the second device. The second update identifier is stored in the first and the second device. The contents of the first update identifiers stored in the devices are updated in the first and the second device if synchronization has been performed and after this said transport layer connection has been ended substantially properly.

Claims (13)

1. A method of arranging synchronization of databases, the method comprising the steps of:
establishing a transport layer connection for synchronization be-tween a first and a second device which synchronize databases, transmitting a first update identifier, which is stored at least in the first device and describes the latest synchronization event the first and the second device have performed in the databases, during initialization of syn-chronization from the first device to the second device, and a second update identifier, which is defined by the first device and describes the present syn-chronization, storing said second update identifier in the first device and in the second device, and updating the contents of the first update identifiers stored in the de-vices with the contents of said second update identifier in the first device and in the second device if synchronization has been performed and after this said transport layer connection has been ended substantially properly.
2. A method according to claim 1, which further comprises the steps of:
comparing the first update identifier received in the second device with the first update identifier stored in the second device, performing synchronization in the requested manner if the first re-ceived update identifier corresponds to the first stored update identifier, synchronizing all data units of the databases if the first received up-date identifier does not correspond to the first stored update identifier.
3. A method according to claim 2, which further comprises the steps of:
transmitting the first stored update identifier from the second device to the first device, comparing also the first received update identifier with the first stored update identifier in the first device.
4. A method according to claim 1, wherein the update identifiers indicate the date and time.
5. A method according to claim 1, wherein synchronization is based on a synchronization protocol according to the SyncML standard, the first update identifier being the Last anchor of syn-chronization and the second update identifier the Next anchor.
6. A method according to claim 1, wherein said transport layer connection is a logical connection in accor-dance with the HTTP protocol, and said transport layer connection has been ended properly if a 'HTTP
request message has been transferred between the first device and the sec-ond device after synchronization and a 'HTTP status response' message re-lated to the 'HTTP request' message has been transmitted and received.
7. A synchronization system for synchronizing databases compris-ing a first device and a second device which perform synchronization and are arranged to establish a transport layer connection between the first device and the second device for performing synchronization, transmit a first update identifier, which is stored at least in the first device and describes the latest synchronization event the first and the second device have performed in the databases, from the first device to the second device during initialization of synchronization and a second update identifier, which is defined by the first device and describes the present synchronization, store said second update identifier, and update the contents of the first update identifiers stored in the de-vices with the contents of said second update identifier if synchronization has been performed and after this said transport layer connection has been ended substantially properly.
8. A synchronization system according to claim 7, wherein the second device is arranged to compare the first update identifier received with the first update identifier stored in the second device, the first and the second device are arranged to perform synchroni-zation in the requested manner if the first received update identifier corre-sponds to the first stored update identifier, or the first device and the second device are arranged to synchronize all data units of the databases if the first received update identifier does not correspond to the first stored update identifier.
9. A telecommunications device comprising means for establishing a transport layer connection to at least one other device for synchronizing databases, means for transmitting a first update identifier and a second update identifier defined by said telecommunications device to the other device during initialization of synchronization, the first update identifier being stored at least in said telecommunications device and describing the latest synchronization event said telecommunications device and the other device have performed in the databases, and said second update identifier describing the present syn-chronization, means for storing said second update identifier, and means for updating the contents of the first update identifier stored in said telecommunications device with the contents of said second update identifier if synchronization has been performed and after this said transport layer connection has been ended substantially properly.
10. A synchronization device comprising means for establishing a transport layer connection to at least one other device for synchronizing databases, means for receiving a first update identifier and a second update identifier from the other device during initialization of synchronization, the first update identifier describing the latest synchronization event said synchroniza-tion device and the other device have performed in the databases, and the second update identifier describing the present synchronization, means for storing said second update identifier, and means for updating the first update identifier with the contents of said second update identifier if synchronization has been performed and after this said transport layer connection has been ended substantially properly.
11. A synchronization device according to claim 10, which also comprises means for comparing the first update identifier received with the first update identifier stored in said synchronization device, means for performing synchronization in the manner requested by the other device if the first received update identifier corresponds to the first stored update identifier, and means for synchronizing data units of all databases if the first re-ceived update identifier does not correspond to the first stored update identi-fier.
12. A computer program product loadable into the memory of a telecommunications device and comprising a code which is executable in the telecommunications device making the telecommunications device establish a transport layer connection to at least one other device for synchronizing databases, transmit a first update identifier and a second update identifier de-fined by said telecommunications device to the other device during initializa-tion of synchronization, the first update identifier being stored at least in said telecommunications device and describing the latest synchronization event said telecommunications device and the other device have performed in the databases, and said second update identifier describing the present synchro-nization, store said second update identifier, and update the contents of the first update identifier stored in said tele-communications device with the contents of said second update identifier if synchronization has been performed and after this said transport layer connection has been ended substantially properly.
13. A computer program product loadable into the memory of a computer functioning as a synchronization device and comprising a code which is executable in the synchronization device making the synchronization device establish a transport layer connection to at least one other device for synchronizing databases, receive a first update identifier and a second update identifier from the other device during initialization of synchronization, the first update identi-fier describing the latest synchronization event said synchronization device and the other device have performed in the databases, and the second update identifier describing the present synchronization, store the second update identifier, and update the contents of the first update identifier stored in said syn-chronization device with the contents of said second update identifier if syn-chronization has been performed and after this said transport layer connection has been ended substantially properly.
CA2447821A 2001-04-25 2002-04-24 Synchronization of database data Expired - Lifetime CA2447821C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US09/842,568 2001-04-25
US09/842,568 US6839564B2 (en) 2001-04-25 2001-04-25 Synchronization of database data
PCT/FI2002/000339 WO2002086758A1 (en) 2001-04-25 2002-04-24 Synchronization of database data

Publications (2)

Publication Number Publication Date
CA2447821A1 true CA2447821A1 (en) 2002-10-31
CA2447821C CA2447821C (en) 2010-11-23

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CA2447821A Expired - Lifetime CA2447821C (en) 2001-04-25 2002-04-24 Synchronization of database data

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US (2) US6839564B2 (en)
EP (1) EP1390874B1 (en)
JP (2) JP2004534994A (en)
KR (1) KR100937163B1 (en)
CN (1) CN100371929C (en)
BR (1) BRPI0209171B1 (en)
CA (1) CA2447821C (en)
EE (1) EE200300518A (en)
WO (1) WO2002086758A1 (en)
ZA (1) ZA200308298B (en)

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