Migration of application schema to windows azure

IJRET: International Journal of Research in Engineering and Technology eISSN: 2319-1163 | pISSN: 2321-7308
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Volume: 03 Issue: 05 | May-2014, Available @ http://www.ijret.org 17
MIGRATION OF APPLICATION SCHEMA TO WINDOWS AZURE
CLOUDS
Amandeep Singh1
, Karandeep Singh2
1
Assistant Professor, Computer Science and Engineering Dept, PTU, BMSCE, Muktsar, India
2
Head & Assistant Professor, MAMC, Agroha, Hisar, Haryana, India
Abstract
Schema migration involves the migration of application schema to clouds. Presently various script generation techniques are there
which are used for schema migration, which also sometimes require the application architecture to be changed to make it compatible
with cloud platform. This paper shows an approach using user templates for capturing the schema structure and access control
mechanism for migration of application schema without using script generation tools. Further it gives the necessary algorithm to
show the feasibility of its implementation.
Keywords— Cloud Computing, rbac, roles, nist, saas, schema, xsd, xml.
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1. INTRODUCTION
Cloud computing is an emerging computing paradigm in which
resources of the computing infrastructure are provided as
services over the Internet [1]. Cloud computing is referred to as
the next big thing in IT, and a great deal of attention has been
focused on cloud technology. In the present scenarios cloud
computing is increasingly being adopted by large businesses
and mid-sized businesses. Moving to the cloud proves to be a
viable option for firms as it dramatically cuts down hardware
and software expenditure [2]. For the efficient migration to the
cloud, it involves transferring the application data as well as
application schema entirely, with authorized access, to the
clouds. Migration of the data to clouds is a phased process
which requires analysis of the schema which is to be moved,
analysis of data and the target cloud platform. BCP is one such
application which is used for migration of data but with a
major drawback that it cannot be used for the migration of
application schema. The challenge is to simplify the process of
schema migration and make it more efficient.
2. BACKGROUND
Cloud Computing moves computing and storage tasks from
individual systems to the cloud, thereby reducing the burden at
user’s end. It enables the delivery of hardware and software
resources over the Internet as a utility. It moves computing and
data away from desktop and portable PCs into large data
centers. Migrating the schema requires capturing the
information regarding the table, no of columns in the table and
data type of the columns in the table, by providing a user
friendly interface. Then, deploying access control over the data
requires capturing the information regarding user roles that
exist in the system, permissions granted to those roles,
according to which data in the tables can be accessed. As the
different user roles can be able to access the table data
according to the permissions given to the different user roles in
the system. In the role based access control
1 A user has access to an object based on the assigned
role.
2 Roles are defined based on job functions.
3 Permissions are defined based on job authority and
responsibilities within a job function.
4 Operations on an object are invocated based on the
permissions.
5 The object is concerned with the user’s role and not
the user. The Role based access control system is
clearly defined and agile, making the addition of new
applications, roles, and employees as efficient as
possible [3].
3. METHODOLOGY
3.1 Procedure
In this proposed approach the authorized users belong to roles,
and the permissions or access rights regarding the usage of
database are granted to roles. The user is provided with the
application interface. Through this application interface the
user provides all the relevant information needed for the
creation of the database and role-based schema on the Cloud.
The information includes the name of various database objects
and roles for the application and the permissions granted to
various roles. It become very easy for the user to create role
based schema on the Cloud as the user only need to specify
his/her requirements through an interactive interface without
taking into consideration of the technicalities of the migration
metadata. The XML file is generated from the information
provided by the user which is then sent to service providers
end where database and role based access control information

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is read from XML file and information regarding database
objects and roles is extracted and deployed over the clouds. For
the implementation of the migration procedure following steps
are used:
1. Acquisition of Database Information.
2. Extraction of roles and database schema.
3. Creation of XML File.
4. Transfer of XML File.
5. Role based access generation.
3.1.1 Acquisiton of Database Information
The first phase of the proposed migration scheme is the
acquisition of database information which is required to
successfully and automatically reconstruct the database schema
of the onsite environment onto the Cloud. The information
consists of description of various database objects,
relationships, consistency constraints and configuration
settings. The user may make use of automated tools that
produce the XML document of the entire database schema but
in this proposed approach we have designed an interface which
is used by the user to generate XML file which contains all the
required information.
3.1.2 Extraction of Roles and Database Schema
The information regarding roles and database objects is the
basis for automatically creating the entire database on the
Cloud. The name, type and number of attributes of various
database objects are extracted along with roles and access
information. Roles describe “who does what” in the application.
Access rights are the permissions which are granted to roles to
access the database. This information is structured in a
standard way by making it comply with the XML schema
document which has been specifically designed to hold
database, roles and access information in such a way that
automatic processing of this information becomes easy for the
server application which will handle it at service provider’s
end. The use of XML document is to extract access control
data from several platforms and represent the access control
data for the entire enterprise [4].
3.1.3 Creation of XML File
In this step, XML file is actually generated which holds the
information gathered during above two steps. This is the file
which the user needs to transfer to service provider’s end, as
the file contains sensitive information (i.e. information
regarding database objects, relationships, access control, roles
etc.).
3.1.4 Transfer of XML File and Role Based Access
Generation
The generated XML file is transferred to the Cloud by
establishing sql connection with database server on the clouds.
The database schema information is extracted from the XML
file and various routines are executed which construct the copy
of the onsite database on Cloud databases along with roles and
their corresponding access rights.
Fig. 1 Steps in the proposed approach
Fig. 1 showing the steps used in the proposed approach.
F. Algorithm Used for generating xml from GUI
The basic algorithm is as follows:
1. Get the values of table_count, column_count, role_count,
Permission_count from user.
2. Start with <table> tag // starting of XML.
3. Insert table name from user within <table_name> tag.
4. Start with the column tag.
5. Insert the column name from user within <column_name>
tag.
6. Go to step 5 until column_count reaches maximum.
7. End of column tag
8. Goto step 3 until table_count reaches maximum
9. Start with <role> tag
10. Insert role name within <role name> tags from user.
11. Start with <Permission > tag.

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12. Insert <table_name> <column_name> <read> < write>
<delete> tag that the user chooses.
13. Set true/false value within <allowed> tag.
14. End of <permission>.
15. Goto step 11 until permission_count reaches Maximum.
16. Closing tags.
Example scenario:
The proposed scheme is demonstrated using an application
called Banking Information System. The Banking Information
System taken here keeps the records of customers regarding
the registration details of the customers and payments. The
employee’s salary is maintained by the administration manager.
The job describes the role that employee plays in the Bank. To
restrict the access to the database by the authorized users, Role
Based Access Control model has been implemented onsite.
4. RESULTS
The proposed scheme has been demonstrated by taking
example scenario. The case study has been done on a Banking
Information system. A Banking Information system is migrated
to the cloud by implementing and making use of the proposed
scheme.
5. CONCLUSIONS
The approach discussed in this paper can be used for migration
of the application schemas to clouds in various real world
scenarios. In this research work role based model is used for
data access. Further Attribute based model can be combined
with the present approach which further enhances the security
of access controls mechanisms on the cloud.
ACKNOWLEDGEMENTS
We convey our sincere gratitude to Prof Sandhu M for
providing us with the platform and opportunity to work in this
area. His encouragement and valuable guidance throughout the
course of the paper was a constant support.
REFERENCES
[1]. Preiya, V. S., Pavithra, R. and Joshi., “Secure Role based
Data Access Control in Cloud Computing”, International
Journal of Computer Trends and Technology, pp. 146-151,
2011.
[2]. Rao, R. and Prakash, P., “Improving security for data
migration in cloud computing using randomized encryption
technique“, IOSR Journal of Computer Engineering, vol. 11,
no. 6, pp. 39-42, May-June 2013.
[3]. Salunke, D., Upadhay, A., Sarwade, A. and Vaibhav,
M. ”A survey paper on Role Based Access Control”,
International Journal of Advanced Research in Computer and
Communication Engineering, vol. 2, no. 3, pp. 1340–1342,
2013.
[4]. Chandramouli, R. “Application of XML Tools for
Enterprise-Wide RBAC Implementation Tasks”, Proceedings
of the fifth ACM workshop on Role-based access control, USA,
pp. 11-18, 2000.
[5]. Damyanov, I. and Holmes, N. “Metadata Driven Code
Generation Using .NET Framework”, International Conference
on Computer Systems and Technologies – CompSysTech, pp.
IIIB.2.1-IIIB.2.6, 2004.
[6]. Das, S., Nishimura, S., Agrawal, D. and Abbadi, A. E.
“Database Migration for Elasticity in a Multitenant Database
for Cloud Platforms”, UCSB Computer Science Technical
Report, 2010-09.
[7]. Foster, I., Zhao, Y. and Raicu, I. “Cloud Computing and
Grid Computing – 360 Degree Compared“, IEEE Grid
Computing Environments (GCE08), 2008.

Migration of application schema to windows azure

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