Bloated pg_catalog.pg_largeobjects
Hello All,
I've got a cluster that's having issues with pg_catalog.pg_largeobject getting massively bloated. Vacuum is running OK and there's 700GB of free space in the table and only 100GB of data, but subsequent inserts seem to be not using space from the FSM and instead always allocating new pages. The table just keeps growing.
Is this a known thing, maybe something special about LOs?
Also, is the only way to recover space here a vacuum full on the table since it's a catalog table?
Thanks,
--
Jon Erdman (aka StuckMojo on IRC)
PostgreSQL Zealot
Import Notes
Reference msg id not found: mail.669c3e0f.59c4.4be7fe7e6c0b49b1@storage.wm.amazon.com
You have to run vacuumlo to remove orphaned large objects.
https://www.postgresql.org/docs/current/vacuumlo.html
Regards,
Priyanka
On Sun, 21 Jul 2024 at 12:46 AM, <postgresql@thewickedtribe.net> wrote:
Show quoted text
Hello All,
I've got a cluster that's having issues with pg_catalog.pg_largeobject
getting massively bloated. Vacuum is running OK and there's 700GB of free
space in the table and only 100GB of data, but subsequent inserts seem to
be not using space from the FSM and instead always allocating new pages.
The table just keeps growing.Is this a known thing, maybe something special about LOs?
Also, is the only way to recover space here a vacuum full on the table
since it's a catalog table?Thanks,
--
Jon Erdman (aka StuckMojo on IRC)
PostgreSQL Zealot
Hi
I would suggest to backup your DB before doing such a thing.
Run Vaccum Full, (VACUUM FULL pg_catalog.pg_largeobject) Running this on
the system table might be risky Make sure you backup the database.
& if you are using PG version above 9.1 use Pg_repack to reclaim the space.
Note: It can be disruptive, so planning and preparing for potential
downtime is essential.
Thanks & regards
*Muhammad Affan (*아판*)*
*PostgreSQL Technical Support Engineer** / Pakistan R&D*
Interlace Plaza 4th floor Twinhub office 32 I8 Markaz, Islamabad, Pakistan
On Sun, Jul 21, 2024 at 3:46 AM <postgresql@thewickedtribe.net> wrote:
Show quoted text
Hello All,
I've got a cluster that's having issues with pg_catalog.pg_largeobject
getting massively bloated. Vacuum is running OK and there's 700GB of free
space in the table and only 100GB of data, but subsequent inserts seem to
be not using space from the FSM and instead always allocating new pages.
The table just keeps growing.Is this a known thing, maybe something special about LOs?
Also, is the only way to recover space here a vacuum full on the table
since it's a catalog table?Thanks,
--
Jon Erdman (aka StuckMojo on IRC)
PostgreSQL Zealot
Vacuum Full will not help here if you have large objects present in the
pg_largeobjects table but not being referred to by any table. Vacuumlo
doesn't require downtime but based on the data it needs to remove can run
long and use resources and hence schedule it in off peak hours. You can do
a dry run to get an estimate.
On Mon, Jul 22, 2024 at 1:21 PM khan Affan <bawag773@gmail.com> wrote:
Show quoted text
Hi
I would suggest to backup your DB before doing such a thing.
Run Vaccum Full, (VACUUM FULL pg_catalog.pg_largeobject) Running this on
the system table might be risky Make sure you backup the database.& if you are using PG version above 9.1 use Pg_repack to reclaim the space.
Note: It can be disruptive, so planning and preparing for potential
downtime is essential.Thanks & regards
*Muhammad Affan (*아판*)*
*PostgreSQL Technical Support Engineer** / Pakistan R&D*
Interlace Plaza 4th floor Twinhub office 32 I8 Markaz, Islamabad, Pakistan
On Sun, Jul 21, 2024 at 3:46 AM <postgresql@thewickedtribe.net> wrote:
Hello All,
I've got a cluster that's having issues with pg_catalog.pg_largeobject
getting massively bloated. Vacuum is running OK and there's 700GB of free
space in the table and only 100GB of data, but subsequent inserts seem to
be not using space from the FSM and instead always allocating new pages.
The table just keeps growing.Is this a known thing, maybe something special about LOs?
Also, is the only way to recover space here a vacuum full on the table
since it's a catalog table?Thanks,
--
Jon Erdman (aka StuckMojo on IRC)
PostgreSQL Zealot