Is there any rationale for (not) running incremental_vacuum in an
transaction?
Unlike a full VACUUM, it seems to work with or without.
Purpose:
We are running with auto_vacuum = INCREMENTAL, and when closing the file in
our software, we do an on-demand cleanup like so:
if (Query('pragma freelist_count') > threshold)
while (time_passed < max_time)
Exec('pragma incremental_vacuum(1)');
In practcie, the condition involves more than a single query, and we will
elevate that from silent to "with UI" if there's a lot to be reclaimed.
A quick (statistically insigificant) test suggests that we do make more
progress within an transaction, OTOH it feels "strange".
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