In memory DBs don't have anything to vacuum.
However... what you (and OP) are looking for might be pragma shrink_memory [1].
[1] https://sqlite.org/pragma.html#pragma_shrink_memory
Ah, you're correct. I read too fast and missed that it was in-memory databases specifically!
alt Hacker News
Ah, you're correct. I read too fast and missed that it was in-memory databases specifically!