International Journal of Engineering Trends and Technology (IJETT) – Volume22 Number3- April2015
Database Migration between Two Heterogeneous
Systems
Gaurav Singh#1, Siddhesh Satardekar#2, Yugandhara Rane#3 , Prof. Alka srivastava#4
#
Department of Computer Engineering, Atharva College of Engineering, Marve Road, Malad(west), Mumbai400095,Maharshtra,India
Abstract— With the development of Database Management
Systems, there is suddenly a need for up gradation from an old
database to a new desired database. For example, sometimes the
organisation might need to migrate data from one database to
another, as they might have one part of their database in oracle
and another part in mysql or MS Access. That is when a Database
Migrator is used to migrate the data between multiple databases.
In database migration, structure development is one of the most
important and major challenges. Each database has different
syntax and semantics, which is a crucial problem in data
migration. There are two steps to perform data migration: First is
structure mapping and second is migration. Traditionally, the
first step was carried out by expert programmers and the second
step was done by a software. In this paper we will see the model of
a new data migration approach between two heterogeneous
databases. This model does data migration by creating a middle
layer.
Keywords— Database migration, Database, Database Migrator.
I. INTRODUCTION
Data migration is the process of migrating data between two
database management systems [1]. We migrate the data from
one platform to another platform in data migration. Data
migration is done for various reasons like storage equipment
replacements, data centre relocation, maintenance, upgrades,
etc. We can take an example of a small company which has
MySQL database which is able to handle the records and
database very efficiently. But as the company expands, the
database increases. So the company needs to expand to a more
efficient database . This is where a Database Migrator is used.
Data migration is an important issue when it is concerned with
the process of updating data. Data which are migrated into new
system are huge in size and are prerequisite for new system
starting up and basis of decision making.[5]
In Data migration, we extract data from the old database and
load it into the new database. Exporting, importing or
migrating data between different sources is very time
consuming and complicated task, especially if these data
sources store data in different formats[3]. We develop data
migration tools so as to save time for migrating into a new
database. It makes data migration simpler and also saves
human resources.
ISSN: 2231-5381
II. LITERATURE RIVEIW
In data migration, the migration of data based on the structural
difference of database is proposed. The difference between two
database are of three types:
A. Syntax Difference
In various databases we use various types of languages.
Therefore we need an extensive knowledge base so as to cover
the grammar of the multiple databases. In data migration, the
request to be send should always be written and send in the
source db language and the output which we get should be
saved by the use of the target database language.
B. Data Model Difference
Data model difference occurs when different types of data
models like object oriented or relational are used. We need to
map the data model of the source database and accordingly
prepare an equivalent of that in the data model of our target
database. For such situation we use a software layer like a
wrapper. Wrapper is used for inter-converting the two
structures in the needed solution.
C. Semantic Defference
Variant analysis and aspect toward the process of developing a
database causes semantic differences between two databases.
Due to this inconsistency, different entities are created for a
certain issue[1]. Lets say a company which has one head office
in Mumbai and one in New Delhi wants to share their data.
Even if the software they used to develop the database is the
same, and the language used is also same, but the title of the
tables used might be different. Hence we need some extra
information about the structure or the data of the databases.
III. ARCHITECTURE
When a database is migrated we first migrate the tables and
then the actual data migration takes place. Before we start the
migration a connection is established between the source and
the destination. Then a list of selected items are displayed to
the user from which the user selects the desired constraints.
After this the actual data migration is initiated.
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International Journal of Engineering Trends and Technology (IJETT) – Volume22 Number3- April2015
Programmatic data migration may involve many phases but
it minimally includes Data Extraction- where data is read from
the old system and Data Loading- where data is written to the
new system[3]. For this purpose we use ETL Algorithmic
strategy. We assume that the source data structure is not same
as destination data structure. In this algorithm we first read the
source data and extract it. After reading the source data various
transformation rules are applied to the selected data.
Transformation rules are basically transformation codes, key
generation, converting data types. Once the format is done we
load the tables. And database is migrated.
IV. PROBLEM STATEMENT
To develop a database migration tool that helps in migrating
data from MS Access to SQLServer, Oracle and MySQL .The
database migrator will take an existing database as an input and
will convert it into desired database format which is the output.
Both the database will be specified by the user. It also has
various other scopes like Security, Interactivity, Time
Efficiency and Flexibility.
V. CONCLUSION
Figure.1: The system architecture[3]
Figure.1 Explains the working of the application.
Today various organisations use different types of databases. If
an organisation wants to shift from one database system to
another database system they have to convert the entire
database to work in another database system. For this database
migrator is used. The purpose is to migrate a database from
source database to destination database. This migrator tool
converts from MySQL to Oracle, SQL server to MS Access,
MS Access to Oracle.
Steps:
1) The first step is the validation step, where the user is asked
username and password for validating.
2) Then the user is asked for the source database which the user
wants to migrate. MySQL, Oracle, SQL Server and MS Access
are the source databases. After the user selects the source
database the connection is made.
3) After making a connection the user is asked for the
destination database. The user is also asked to select the tables
and columns which are supposed to be migrated.
4) The user is provided with the facility to select either the
schema of the table or rows of the table along with the
constraints which are applied to the tables.[3]
5) After that the user starts the migration process. If the
migration is successful a success status report is shown on the
screen. If the migration is pending or cancelled the screen
shows status accordingly.
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VI. FUTURE WORK
a) Scheduling :
One can migrate the data at any time. If you want to migrate
the data at 5 o’clock then you can set the time. [6]
b) Migration can be done in a small area network :
One can migrate the data in LAN or Wi-Fi. [6]
ACKNOWLEDGMENT
We are extremely grateful to Ms. Alka Shrivastava for her
constant guidance and support.
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International Journal of Engineering Trends and Technology (IJETT) – Volume22 Number3- April2015
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