I've got a large table from which I'd like to completely reclaim space. I read the docs and it sounds like I can’t run `vacuum full`, because this table is accessed constantly and can’t have downtime. Assuming that’s true, what do you think of the following idea? Is there a better alternative?
1. Replace the table T with two tables T1 and T2 and a view T that is `select * from T1 union T2`. 2. Write only to T1, and slowly move records from T2 to T1. 3. When T2 is empty, redefine the view T to be simply `select * from T1`. 4. Recreate or vacuum full T2, so space is fully reclaimed. 5. Redefine view as the union select and repeat process going other direction from T1 to T2, as needed.
I guess one question is whether I can do 1 and 3 (renaming tables, redefining views) atomically without disturbing concurrent select queries.