The Importance of Parallelism in Querying

In this engaging conversation, the speakers discuss the benefits and limitations of parallelism in Postgres. They highlight that many people are unaware of Postgres' ability to run queries in parallel and its potential for improving query speed. They also mention the difference between parallelism and just-in-time compilation (JIT), noting that the defaults for parallelism settings are better. However, the speakers recommend disabling JIT for OLTP cases. They touch on the impact of parallel queries on planning time and emphasize that parallel execution is only applicable within a single machine. They mention that parallelism is currently available only for read operations in Postgres. Overall, they express optimism about the continuous improvements in parallelism and its importance in optimizing query performance.