PostgreSQL vs. SQL Server: Security Model Differences | POSETTE: An Event for Postgres 2026

Microsoft Data Platform (MVP) compares key differences in his talk “PostgreSQL vs. SQL Server: Security Model Differences” at POSETTE: An Event for Postgres 2026. Abstract: Security is paramount in database management. If you are an SQL Server expert looking to learn PostgreSQL, it is essential to understand how PostgreSQL's security model differs from that of SQL Server. This talk will compare the security models of both database systems. Aimed at database administrators and developers, the presentation will highlight the key differences in how these systems handle user authentication, roles, and permissions. For example, did you know that: - SQL Server distinguishes between logins and users, whereas PostgreSQL uses a unified role-based system for authentication and authorization. - SQL Server offers predefined server and database roles, such as sysadmin, which provides a range of out-of-the-box permissions. Conversely, PostgreSQL includes default roles like pg_read_all_data, designed to simplify standard permission sets. - SQL Server allows the creation of custom roles with flexible permission assignments. PostgreSQL's roles enable inheriting permissions from other roles and support complex role hierarchies. Understanding these differences and others discussed during the session will enhance your grasp of the security model distinctions between SQL Server and PostgreSQL, enabling you to implement security best practices in either environment. Taiob Ali is a Microsoft Data Platform MVP with over 19 years of experience designing and implementing data solutions across finance, e-commerce, and healthcare. His expertise includes the Microsoft Data Platform, MongoDB, Azure AI, and Python for data-driven innovation. As a dedicated community advocate, Taiob has presented at over 100 events worldwide, including SQL Saturdays, Data Saturdays, and international conferences. ► Video chapters: ⏩ 00:00 – Music & introduction ⏩ 01:49 – Definitions: authentication vs authoriz