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Introduction to Database Migration

PostgreSQL database is increasingly becoming one of most chosen database migration target for enterprises. This complete guide to migration gives you everything you need to know for moving your database from Oracle to PostgreSQL.

What is database migration?

Database migration – in layman’s term – means moving your database server from one database engine to another. There are both commercial and open-source database engines provided by different companies. Some of the most popular databases are Oracle, MySQL, Microsoft SQL Server, PostgreSQL, DB2, MongoDB, MariaDB, SAP HANA etc.

Types of Database Migration

  • Homogenous Database Migration : When both the source and target database engines are same, this is referred as Homogenous Database Migration.
  • Heterogeneous Database Migration : When the source and target database engines are different, this is referred as Heterogeneous Database Migration.

Why Migrate from Oracle to PostgreSQL?

  • Organizations choose to migrate from commercial databases like Oracle, SQL Server to Open-source database like PostgreSQL for a variety of reasons, the important out which is to reduce database licensing costs.
  • PostgreSQL is the world’s most advanced open source database. PostgreSQL community is very strong and they are continuously improving existing PostgreSQL features and also add new features. This is the main reason why many vendors including AWS, Microsoft, Google provide cloud platforms for PostgreSQL database.
  • Managing databases to run at scale with high availability and reliability is difficult, time consuming and expensive. This is why, many companies are moving their databases to cloud to explore fully managed, high performance, and cost effective databases.

What You Must Know Before You Start Database Migration

Database migration is a complex, multiphase process, which usually includes assessment, database schema conversion (if you are changing engines), script conversion, data migration, functional testing, performance tuning, and many other steps.

You must be aware of all the information required to finish your database migration project successfully. Following are few items to be considered before you get started.

  • Understand your requirements, your business growing demands
  • Decide your target database and understand your source and target databases
  • Plan your time as database migration projects usually include refactoring of the application and database code, and also the schema, which is a time-consuming, iterative process
  • Plan your resources including database migration experts, security, networking.
  • Additionally, you can get more info in Database Migration—What Do You Need to Know Before You Start?
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