Issn 2319 5967 Iso 9001 2008 Certified International -Books Download

ISSN 2319 5967 ISO 9001 2008 Certified International

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As seen in Fig.1, a remote database is free to exchange information with any other database. This type of solution is useful when a team of people is working in remote locations and do not have access to a central database. These workers often need to share information amongst each other, but since they do not have connectivity to the central



ISSN 2319 5967
ISO 9001 2008 Certified
International Journal of Engineering Science and Innovative Technology IJESIT
Volume 3 Issue 4 July 2014
Fig 1 Sync Framework Database Synchronization
Cache coherency maintaining multiple copies of data in sync across multiple caches
RAID redundant array of independent disks where data is written in a redundant fashion across multiple
disks so that the loss of any one disk does not lead to a loss of data
Database replication where copies of data in a database are kept in sync despite possible large
geographical separation
Journaling a technique used by many modern file systems to make sure that file metadata are updated on a
disk in a coherent consistent manner
Data Synchronization Techniques
The increasing decentralization of information raises the need to synchronize data across numerous devices and
data storage locations Synchronization processes comprise a source and destination entity and based on data
appearance is categorized into unidirectional and bidirectional synchronization
Unidirectional synchronization
Unidirectional synchronization 2 replaces all content of the destination entity with data from the source entity
1 Back up synchronization methods create replica mirror files
New and updated files are copied from source to destination entity
New files added to the source entity are copied to the destination entity
Deleted files in the source are also deleted from the destination entity
2 If older versions of files in the destination entity need to be kept an archiving feature can be enabled which
includes that deleted files in the source entity are not deleted from the destination entity
3 Consolidation does not keep track of file conflicts or deletions
New files added to the source are copied to the destination and new files added to destination are copied to
the source
Deleted files in the source are copied back from destination entities and vice versa
Updated files in the source copy over older files in the destination and vice versa
Bidirectional synchronization
Bidirectional synchronization means two way file synchronization merging data from source and destination
1 New and updated files are copied both ways
2 New files added to the source entity are copied to the destination and vice versa
ISSN 2319 5967
ISO 9001 2008 Certified
International Journal of Engineering Science and Innovative Technology IJESIT
Volume 3 Issue 4 July 2014
3 Deleted files in the source are deleted from destination entities and vice versa
4 Updated files in the source are copied over older files in the destination entity and vice versa
5 If a file changes in both entities the file is in conflict and needs to be reconciled manually
For fast synchronization files are transparently stored in a cache Changes in the cache get automatically
invalidated or updated when used with a sparse cache and entries get inserted when used with a complete cache
II RELATED WORK DONE
1 Data Synchronization Using Cloud Storage 2012
In this paper 3 authors Sudha S Brindha K Sai Vamsy Krishna S Gokul K and Sanath Kumar M had explained
that Cloud computing usually consists of front end user devices and back end cloud servers This gives users to
access a large volume of storage on the cloud In this paper the user can upload files from mobile or PC to the cloud
storage These files will be automatically synchronized to the user s devices when they are connected to the
internet So user files can be viewed from anywhere from any device In the existing system we need to download
files manually This paradigm provides the user to synchronize data automatically between devices They had
implemented this paradigm for windows platform
2 Solving Problems in Software Applications through Data Synchronization in Case of Absence of the
Network 2012
In this paper 4 authors Isak Shabani Betim i o and Agni Dika had presented an algorithm for data
synchronization based on Web Services WS which allows software applications to work well on both
configurations Online and Offline in the absence of the network For this purpose is in use Electronic Student
Management System ESMS at the University of Prishtina UP with the appropriate module Since the use of
ESMS because of a uncertain supply of electricity disconnecting the network and for other reasons which are not
under the control of professional staff that manages the performance of this system has interruption to the online
work In order to continue working in such conditions are founded adequate solutions to work in offline mode and
later data synchronization in normal conditions
3 Data Synchronization for Cognitive Load Estimation in Driving Simulator based Experiments 2012
In this paper 5 authors Zeljko Medenica and Andrew L Kun explained that analyzing the effects of driver
distraction and inattention on cognitive load has become a very important issue given the substantial increase in the
number of electronic devices which are finding their way into vehicles Typically the separate equipment is used
for collecting different variables sensitive to cognitive load changes In order to be able to draw reliable
conclusions it is important to possess dependable ways of synchronizing data collections between different
equipment This paper offers one low cost solution which enables synchronizing three types of devices often used
in driving research driving simulator eye tracker and physiological monitor
4 A Distributed Architecture for Transactions Synchronization in Distributed Database Systems 2010
In this paper 6 authors Arun Kumar Yadav and Dr Ajay Agarwal explained that various concurrency control
algorithms have been proposed for use in distributed database systems But the number of algorithms available for
the distributed concurrency control come into one of three basic classes locking algorithms Timestamp
algorithms and optimistic or certification algorithms In this paper we are presenting a Distributed Transaction
Processing Model and an approach for concurrency control in distributed database systems The analysis of our
approach is a decomposition of the concurrency control problem into two major sub problems read write and
write write synchronization We describe a series of synchronization techniques for solving each sub problem and
will show how to combine these techniques into algorithms for solving the entire concurrency control problem
Such algorithms are called concurrency control methods Our approach concentrates on the structure and
correctness of concurrency control methods and also the performance of such methods up to some extent
5 The Impact of Data Synchronization Adoption on Organizations 2009
In this paper 7 authors Susan G Zucker and Shouhong Wang had explained that Data synchronization is
required for supply chain management in the B2B e commerce environment This case study examined the impact
of the adoption of data synchronization on three large consumer product goods organizations The study identified
process and structural inadequacies that developed as the result of the implementation as well as how these
organizations recognized benefits and future opportunities after data synchronization adoption The findings
revealed the significance of internal alignment around data cleansing and accuracy as well as opportunities for
ISSN 2319 5967
ISO 9001 2008 Certified
International Journal of Engineering Science and Innovative Technology IJESIT
Volume 3 Issue 4 July 2014
improved external alignment from a systems perspective The synergy created between product item management
data synchronization and internal champions existed at all three companies The workflow re design process
improvements and standards development imposed on these organizations by the clean data requirement of data
synchronization provided the greatest benefits from the data synchronization process
6 Synchronization in an Embedded DBMS Environment 2006
In this paper 8 author Sang Wook Kim had explained that the embedded DBMS is a lightweight DBMS for
effective management of quite small databases contained in tiny mobile devices Synchronization is a core function
of the embedded DBMS to preserve the consistency of data replicated in the server and client databases This paper
presents a framework for synchronization in embedded DBMS environment His first address key issues for
realizing synchronization and then propose solutions to them obtained from our development The main issues
touched here are 1 classifying conflicts 2 identifying changes in a client database 3 detecting conflicts and
4 resolving conflicts The proposed framework would help reduce the trial and errors of embedded DBMS
developers in implementing their synchronization server
III MODEL PRESENTATION
Fig 2 Flow chart of data synchronization
As shown in Fig 2 the steps for data synchronization algorithm are given below
Step 1 Enter the data in the form and upload the image to save in the database
ISSN 2319 5967
ISO 9001 2008 Certified
International Journal of Engineering Science and Innovative Technology IJESIT
Volume 3 Issue 4 July 2014
Step 2 Check the network connection either available or not
Step 3 If a network connection is not available we switch on the offline mode Then data stored on client database
and image stored in the folder on the client machine and again it will continuously check whether the network
connection is available or not
Step 4 If a network connection is available we switch on the online mode and it will perform the following
operations
Check whether any entry exists on the client database
1 If no entry exists on the client database then data with images stored on the server
2 If any entry exists on the client database then retrieve the minimum ID its corresponding column with the
image until the database is empty
Transfer the data with an image of that ID on the server and delete it from the client database and delete images
from client machine
Then data with images stored on the server
IV CONCLUSION AND FUTURE SCOPE
The objective of the research is to provide an algorithm to solve the problem that when all clients are reliant on a
single server If that database becomes unavailable due to planned server downtime or from server failures all of
the remote workers will be disconnected from their data Data is stored on their system user system When the
user connected to the internet data automatically sink from their client system to the server in serial order
In the future application developers should work with serial of data sink should be in order between offline and
online application In our research when two different images from two different clients uploaded on a server then
the first image replaced with another In the future researcher solved the problem of data synchronization with
image uploading
ACKNOWLEDGEMENT
I would like to thank my parents and my friends for their support and trust
REFERENCES
1 en wikipedia org wiki Synchronization computer science
2 Zach McCormick and Douglas C Schmidt Data Synchronization Patterns in Mobile Application Design proceedings of
the Pattern Languages of Programs PLoP 2012 conference October 19 21 Tucson Arizona
3 Sudha S and Brindha K Data Synchronization Using Cloud Storage International Journal of Advanced Research in
Computer Science and Software Engineering Volume 2 Issue 11 November 2012
4 Isak Shabani Betim i o and Agni Dika Solving Problems in Software Applications through Data Synchronization in
Case of Absence of the Network IJCSI International Journal of Computer Science Issues Vol 9 Issue 1 No 3 January
5 Zeljko Medenica Andrew L Kun Data Synchronization for Cognitive Load Estimation in Driving Simulator based
Experiments AutomotiveUI 12 October 17 19 2012 Portsmouth NH USA
6 Arun Kumar Yadav and Dr Ajay Agarwal A Distributed Architecture for Transactions 2010
7 Susan G Zucker Shouhong Wang the impact of Data synchronization adoption on organizations a Case study
Journal of Electronic Commerce in Organizations Volume 7 Issue 3
8 Sang Wook Kim Synchronization in an Embedded DBMS Environment IJCSNS International Journal of Computer
Science and Network Security VOL 6 No 7A July 2006
9 Thorsten Sch utt Florian Schintke Alexander Reinefeld Efficient Synchronization of Replicated Data in Distributed
10 Wu Jie Ming Yu Li ping Research and Design of Smart Client Data Synchronization Engine Proceedings of the 2009
International Workshop on Information Security and Application IWISA 2009 Qingdao China November 21 22 2009
11 Zhen Fang Lixin Zhang John B Carter Fast Synchronization on Shared Memory Multiprocessors An Architectural
ISSN 2319 5967
ISO 9001 2008 Certified
International Journal of Engineering Science and Innovative Technology IJESIT
Volume 3 Issue 4 July 2014
12 http msdn microsoft com enus library bb902827 aspx accessed on March 2 2014
13 https developer appcelerator com question 131168 sync local andserverSQL database ant tools out there or best p
ractices accessed on March 2 2014


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