What privileges does the user of the Repository Database need?

Navicat On-Prem Server will use your user account to create the necessary objects in the repository database. Please make sure that the user account has been granted the proper privileges.

MySQL/MariaDB

SELECT, INSERT, UPDATE, DELETE, CREATE, DROP, INDEX, ALTER, CREATE TEMPORARY TABLES, CREATE VIEW on all database objects

PostgreSQL

Can login, Can create database and Superuser

SQL Server

CREATE, UPDATE, SELECT and DELETE