Database Migration Guides

Migrating from MySQL to PostgreSQL is one of the most common database migrations. Both are mature open-source relational databases, but they have significant differences in SQL dialect, data types, and behavior. PostgreSQL is stricter about SQL standards compliance, which can surface issues that MySQL silently accepts.

Migrating from MySQL to Microsoft SQL Server involves converting MySQL's SQL dialect to T-SQL, adapting data types, and porting MySQL-specific features to their SQL Server equivalents. SQL Server's T-SQL is feature-rich but has significant syntax differences from MySQL's SQL.

Migrating from PostgreSQL to MySQL typically means losing some PostgreSQL-exclusive features. This guide covers what changes are required, what features must be simplified, and how to minimize risk during the migration.

Migrating from SQL Server to PostgreSQL is a popular path for organizations moving away from Microsoft's proprietary platform to open-source. The main effort involves converting T-SQL syntax, stored procedures (to PL/pgSQL), and handling SQL Server-specific features.

Oracle to PostgreSQL is one of the most complex database migrations due to Oracle's extensive use of PL/SQL, Oracle-specific SQL extensions, and proprietary features like CONNECT BY hierarchical queries. The Ora2Pg tool is specifically designed for this migration path.

Migrating from SQLite to PostgreSQL is typically done when an application needs to scale beyond SQLite's single-file, single-writer limitations. PostgreSQL supports concurrent writes, replication, and much larger datasets. The migration is relatively straightforward compared to other database migrations.