Why Migrate Databases Instead of Direct Connection?

When modernizing software, one common reason is the transition from outdated systems to contemporary ones. Large data storage techniques are now essential to handle modern information requirements.

Migrating to Modern Data Storage Techniques

Modern companies may choose to move from traditional SQL databases to data lakes or other flexible systems. This transition is driven by the need for scalability, flexibility, and modern storage methods that can handle big data efficiently. For instance, a company deciding to transition from an old SQL database to a more modern, scalable storage system can significantly improve the efficiency and usability of their data management processes.

Merging Data Across Departments

Another frequent reason for data migration is consolidating data into a single, accessible location for all departments within an organization. This could occur during an acquisition, where systems need to be unified, or when different systems are isolated throughout an organization. For example, the IT department may use one database, while the Marketing team uses another, and these separate systems need to be integrated.

Should I Migrate Data or Simply Connect to an Existing Database?

The question often arises: should you migrate data to a new database or simply connect a new application to the existing one? The answer often depends on your specific needs and the context of why you're embarking on a migration project.

For instance, if you're developing a new application that needs access to existing data without the need to upgrade hardware or change database systems for all applications, it's generally more efficient to point the new application to the existing database. Data duplication is not only redundant but can also lead to more complexity and potential issues.

When to Consider Database Migrations

However, there are specific scenarios where it is beneficial to migrate data rather than just connecting to an existing database:

Different Schema Requirements: The current database might be an operational OLTP (Online Transaction Processing) style database, while the new application is more analytical. In such cases, a different schema design, such as Snowflake or Star, might be necessary. Alternatively, complex analytical queries could affect OLTP performance, necessitating a separate database. Poor Query Support: If the current database system is incapable of handling the kinds of analytical queries required by the new application, a migration could be necessary to support these queries effectively. Data Quality Issues: If the current system contains data that is not clean or lacks comprehensive audit rules, the new application might require a clean dataset. Migrating the data to a new database can help ensure data integrity and accuracy.

In conclusion, while direct connection to an existing database is often the simplest and most efficient solution, there are specific scenarios where a database migration can provide significant benefits, such as improved data management, better query support, and data quality. Careful consideration of these factors can help organizations make the best decision for their specific needs.