While there are many features within PostgreSQL that are really similar to those within SQL Server, there are some that are unique. One of these unique features is called VACUUM. In my head, I compare this with the tempdb in SQL Server. Not because they act in any way the same or serve similar purposes. They absolutely do not. Instead, it’s because they are both fundamental to behaviors within their respective systems, and both are quite complex in how they work, what they do, and the ways in which we can mess them up.
VACUUM is a complex, deep, topic,