Re: Adding REPACK [concurrently]

Mihail Nikalayeu <mihailnikalayeu@gmail.com> wrote:

> > The 0006 part needs more work (definitely beyond PG 19).
>
> This is sad, because if you are in a situation then you need REPACK - pinning the horizon for too long may just
finishyour DB.... 
> And also, even with 0006 we still need to build indexes, which might pin it for long (even duration caused by a
singleindex). 

I suppose "to finish database" refers to XID wraparound - a problem that you
keep mentioning again and again. (Yes, the wraparound is a problem, but not
exactly a "final" state of the database.)

As far as I know, it's not uncommon for DBAs to use the pg_repack extension,
and this extension also restricts the progress of the VACUUM xmin horizon. Are
you sure that users do complain about having ended up in the XID wraparound
situation?

I don't really pay attention to pg_repack, but I do pay quite some attention
to the pg_squeeze extension (which I wrote and maintain). I recall that some
users were surprised by the amount of disk space consumed (as the earlier
versions of pg_squeeze were "too lazy" about WAL decoding), but I do not
recall a single complaint about pg_squeeze causing the XID wraparound
situation.

--
Antonin Houska
Web: https://www.cybertec-postgresql.com