Why we changed our approach to memory mapping at QuestDB (YC S20)

Hi HN,

Author here. QuestDB is a fast SQL open source database for time series. About a month ago we launched on HackerNews [1].

Today, I am excited to announce QuestDB 5.0.3 [2]. This new release includes our changes in memory mapping strategy, giving us better performance, as well as some major changes to the Postgres wire protocol support.

In this blog post, we explain our journey to improve QuestDB's performance, especially regarding memory management. Relying as much as possible on the kernel and avoiding extra layers turned out to be very successful.

Thanks

Vlad

[1] https://news.ycombinator.com/item?id=23975807

[2] https://questdb.io/getstarted/