Cost savings, consolidation, standardization, operational
efficiency, performance, new technologies and so on, reasons might
be plenty that drive most of the organizations to migrate their
databases to another database management system (DBMS) product.
But, most database migrations can be very complex and
time-consuming as each database consists of its own proprietary
features. It is quite a challenge for enterprises to shift from one
DBMS to another. Migration projects can also take several months
and involve huge initial costs, which force enterprises to postpone
or cancel their plans of migration.
But for enterprises which interpret that migration is quite
essential to stay ahead of the competition, it is a must for them
to draw a migration strategy to ensure careful planning, skilled
resources, smart use of tools, and thorough testing to be
successful. The basic goal of a migration project is to transfer
data from source legacy system to a target new system and the
challenge is the difference between the structures of the two
separate databases. Database Migration Testing will ensure that
applications developed for data migration from legacy to new
platforms work correctly and efficiently.
It is imperative for enterprises to consider the business risks
involved with migrating data between two systems. Several aspects
like physical and logical architecture of the database, security,
functionality and performance should be tested. The security
mechanisms can be quite different across two discrete databases.
Hence, security must be ensured to allow only authorized users to
have access to the database. Also, data migrated must be ensured
for correctness and completeness, and must be validated upon
completion of the migration.
While there evolved many database compatibility layers that
support another DBMS's proprietary extensions natively, which would
increase the speed of migrations, testing would normally remain the
same and is still very critical. Quality assurance and testing
specialists should be involved right from the starting stage of a
data migration project, as even the type of legacy database can
have an impact on the way data migration is carried out. Right from
the analysis phase, test strategizing should be done and detailed
test cases mush be developed, while continually refining them in
the project. Apart from the application testing, performance and
scalability testing of the application and database must be ensured
that new levels meet the enterprise specific requirements. Overall,
effective database migration testing using a mix to automation and
manual methodologies can ensure performance, reliability,
scalability, and availability.