Powerful command line tool that supports migration to PostgreSQL from multiple source databases, including SQL Server.
Microsoft Data Migration Assistant (DMA)
A free tool provided by Microsoft that supports evaluating and performing database migrations.
Available in open source and commercial versions, with a graphical interface and support for multiple data sources and targets.
Open source tool that supports data replication and migration between multiple database systems.
Data documentation tools that also provide migration support and evaluation capabilities.
Database migration tool for developers, supporting version control and script execution.
During the migration of SQL Server to PostgreSQL, carefully evaluate the differences between the two database systems, including compatibility of data types, functions, and stored procedures. Choose an appropriate migration tool, such as pgloader, to simplify the task of data migration and structural transformation. At the same time, be aware of differences between SQL syntax and features that may require you to manually adjust the code for some stored procedures or triggers.
The success of migration directly affects the stability of the database and the normal running of the application in the production environment. Therefore, before performing the migration, it is important to conduct thorough testing in a test environment to verify data consistency and application stability. Back up your data and have a rollback plan in place so that it can be restored quickly if something goes wrong during the migration.
There are many tools that support SQL server to PostgreSQL migration tool, and we chose pgloader for the demo.
Pgloader is a powerful tool for migrating data from different database systems to PostgreSQL. It can handle data type mapping, structural transformation, and data loading between different databases, and provides flexible configuration options.
Update the package list:
sudo apt-get update
sudo apt-get install pgloader
Use tools provided by SQL Server, such as BCP and SSIS, to export data:
bcp "SELECT * FROM YourTable" queryout data.txt -S YourServer -U YourUser -P YourPassword -c -t
Create a configuration file, such as migrate.load, that specifies the migration rules for SQL Server to PostgreSQL:
WITH include no drop, create tables, create indexes, reset sequences,
SET work_mem to '16MB',
maintenance_work_mem to '512 MB';
ALTER SCHEMA 'dbo' RENAME TO 'public';
Run the following command in the terminal:
|Traditional SQL Databases
|PostgreSQL Global Development Group
|Open Source and Free
|May have commercial licenses
|Data Type Support
|Diverse, including arrays, JSON, XML, etc.
|Relatively traditional data type support
|Advanced, supports custom functions and plugins
|May be more limited
|Robust performance optimization tools and settings
|Performance optimization varies by database
|MVCC (Multi-Version Concurrency Control) support
|Relies on traditional locking mechanisms
|Rich support for spatial data
|Depends on the database
|Supports various constraint types, including CHECK and FOREIGN KEY
|Typically supports basic integrity constraints
|Triggers and Stored Procedures
|Supports complex triggers and stored procedures
|Depends on the database
|SQL Server Integration Services (SSIS) for ETL
|Supports ETL through external tools, native tools, and extensions