Thank Tom! We will check it. On Fri, Nov 2, 2018 at 10:35 PM Tom Lane <t...@sss.pgh.pa.us> wrote:
> Haozhou Wang <haw...@pivotal.io> writes: > > We meet a corner case that related to the behavior of Vacuum Full. > > ... > > If we run both sql scripts on same database in parallel, the "VACUUM FULL > > a;" will not release the disk space. > > I think what's happening is that the delete in script 1 happens after the > "pg_sleep" in script 2 starts. Then the pg_sleep has an open snapshot > that could potentially see the deleted rows, so they can't be removed yet. > > You could check this theory by changing the vacuum to use VERBOSE, and > seeing what it says about rows that can't be removed yet. > > regards, tom lane > -- Regards, Haozhou
