New old "debug_parallel_query" setting in PostgreSQL 16

03.2023 / Category: / Tags: | |

Naming variables

Why will force_parallel_mode - the runtime option be renamed to debug_parallel_query in PostgreSQL 16? Proper variable and function naming play a vital role in making code understandable, maintainable, and easily shareable. When we give our variables descriptive names that reflect their purpose, it becomes much simpler for others to understand our code, follow our logic, and make necessary changes. Using vague or ambiguous variable names makes our code more challenging to read.

People often tend to ignore manuals and rely solely on variable names to guess their purpose. However, this can lead to errors and misunderstandings, making it essential to take the time to name variables thoughtfully and accurately. That is exactly what happened to "force_parallel_mode" PostgreSQL runtime option. It led some users to think this parameter somehow enables parallel query execution, which is absolutely not the case!

Rename it to debug_parallel_query! Immediately!

Thanks to David Rowley, this setting will have a new name "debug_parallel_query". The patch was reviewed by John Naylor. Committed by David Rowley. The commit message is:

What can I say? Sounds legit to me! I'll never-ever touch a runtime option with a "debug" prefix on my production clusters. What about you? 😉


If you want to know more about available PostgreSQL runtime options aka GUCs (Grand Unified Configuration) check the official manual.

And, of course, check out out the “what’s new” post series to know more about upcoming PostgreSQL versions.

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