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About cross join in PostgreSQL
© Laurenz Albe 2021 For many people, “cross join” is something to be afraid of. They remember the time when they forgot the join condition and the DBA was angry, because the query hogged the CPU and filled the disk. However, there are valid use cases for cross joins which I want to explore in […]
Data warehousing: Making use of synchronized seq scans
PostgreSQL contains some hidden gems which have been around for many years and help to silently speed up your queries. They optimize your SQL statements in a clever and totally transparent way. One of those hidden gems is the ability to synchronize sequential scans. Actually, this feature has been around for 15+ years, but has […]
Disabling autocommit in PostgreSQL can damage your health
© Laurenz Albe 2021 When analyzing customer’s problems, I have seen the mess you can get into if you disable autocommit in your interactive client, so I’d like to bring this topic to a wider audience. What is autocommit? In PostgreSQL, like in any other ACID-complicant database, each statement runs in a transaction: if the […]