Re: BUG #17717: Regression in vacuumdb (15 is slower than 10/11 and possible memory issue) - Mailing list pgsql-hackers

Nathan Bossart <nathandbossart@gmail.com> writes:
> On Wed, Dec 28, 2022 at 03:13:23PM -0500, Tom Lane wrote:
>> +        executeCommand(conn, "VACUUM (ONLY_DATABASE_STATS);", echo);

> When I looked at this, I thought it would be better to send the command
> through the parallel slot machinery so that failures would use the same
> code path as the rest of the VACUUM commands.  However, you also need to
> adjust ParallelSlotsWaitCompletion() to mark the slots as idle so that the
> slot array can be reused after it is called.

Hm.  I was just copying the way commands are issued further up in the
same function.  But I think you're right: once we've done

    ParallelSlotsAdoptConn(sa, conn);

it's probably not entirely kosher to use the conn directly.

            regards, tom lane