PGConf.Russia 2023

There is set of Ansible roles for any Postgres configuration: a standalone instance; a streaming replica; patroni+etcd; stolon+etcd; patroni+consul; stolon+consul. In this talk, we will discuss why using this set of Ansible roles is better than other solutions.

We will tell you how we store database objects in the version control system. Then we compare the traditional approaches to manage database migrations and the one we preferred. We will talk about both methods advantages and disadvantages. Finally, we will present our change management solution - pgmig.

I will share the experience of migration project of an information system from a Microsoft SQL Server DBMS to Postgres PRO. The owner of the DBMS is Rosagroleasing JSC.

The volume of the DBMS database is about 6 TB (more than 300 tables, up to 4 billion records in each). The team adapted 15 ETL packages and 131 procedures with full functionality and also partial refactoring of the source code. Systems' performance has remained the same.