Thread: Huge table pg_shdepend

Hi

I'm struggling with a huge table pg_shdepend. My database has a size of
640MB exclude the size of the system tables. But the real size of the db
is more than 2GB. The reason is a huge table pg_shdepend with more than
32000000 records.  PgAdmin3 shows a table size of
1885MB and an index size of 1690MB. This looks strange for me, because
this size is a multiple amount of the db size itself. I believe, that
there are a lot of rubbish in that table, but I'm not sure.

I had run a vacuum full process, but this didn't help. Could anyone give
me an advice how to clean the table pg_shdepend or reduce the table size?

Any hit would be appreciated.

Regards
Horst

--
Dr. Horst Düster
Managing Director
Sourcepole AG - Linux & Open Source Solutions
Weberstrasse 5, 8004 Zürich, Switzerland
Tel: +41 (0)44 440 77 11
Direkt: +41 (0)44 515 67 70
horst.duester@sourcepole.ch  http://www.sourcepole.ch

qgiscloud.com - Karten einfach vom Desktop ins Netz

--

>>>>> "Horst" == Horst Düster <horst.duester@sourcepole.ch> writes:

 Horst> Hi

 Horst> I'm struggling with a huge table pg_shdepend. My database has a
 Horst> size of 640MB exclude the size of the system tables. But the
 Horst> real size of the db is more than 2GB. The reason is a huge table
 Horst> pg_shdepend with more than 32000000 records.

pg_shdepend has a row for every object and every ACL entry that records
which role (other than the initial db superuser) owns the object or is
referenced from the ACL entry.

Do you have an unusually large number of tables (or other database
objects)?

Note that there's a single pg_shdepend table shared between all
databases in the cluster; it's not part of any single database but
rather is a "global" table. So what matters is the total number of
objects over all databases, not the size of any single db.

--
Andrew (irc:RhodiumToad)

On 1/21/19 4:18 AM, Horst Düster wrote:
> Hi
>
> I'm struggling with a huge table pg_shdepend. My database has a size of
> 640MB exclude the size of the system tables. But the real size of the db
> is more than 2GB. The reason is a huge table pg_shdepend with more than
> 32000000 records.  PgAdmin3 shows a table size of
> 1885MB and an index size of 1690MB. This looks strange for me, because
> this size is a multiple amount of the db size itself. I believe, that
> there are a lot of rubbish in that table, but I'm not sure.
>
> I had run a vacuum full process, but this didn't help. Could anyone give
> me an advice how to clean the table pg_shdepend or reduce the table size?

Silly question: did you vacuum the postgres database, or your user database(s)?

Also, you should do the "vacuumdb --freeze --dbname=postgres" when nothing 
else is attached to any databases, so that nothing else can be holding old 
records in that table.

-- 
Angular momentum makes the world go 'round.

Hi zuhair

Thank's for your quick response. To use pg_repack it is not an option unfortunately, because it's not possible to install additional software at the db server. Are there other options to do with the postgresql onboard tools?

Regards
Horst

Hi Horst,

Try pg_repack 

http://reorg.github.io/pg_repack/

On Mon, 21 Jan 2019 at 1:18 PM Horst Düster <horst.duester@sourcepole.ch> wrote:

Hi

I'm struggling with a huge table pg_shdepend. My database has a size of
640MB exclude the size of the system tables. But the real size of the db
is more than 2GB. The reason is a huge table pg_shdepend with more than
32000000 records.  PgAdmin3 shows a table size of
1885MB and an index size of 1690MB. This looks strange for me, because
this size is a multiple amount of the db size itself. I believe, that
there are a lot of rubbish in that table, but I'm not sure.

I had run a vacuum full process, but this didn't help. Could anyone give
me an advice how to clean the table pg_shdepend or reduce the table size?

Any hit would be appreciated.

Regards
Horst

--
Dr. Horst Düster
Managing Director
Sourcepole AG - Linux & Open Source Solutions
Weberstrasse 5, 8004 Zürich, Switzerland
Tel: +41 (0)44 440 77 11
Direkt: +41 (0)44 515 67 70
horst.duester@sourcepole.ch  http://www.sourcepole.ch

qgiscloud.com - Karten einfach vom Desktop ins Netz

--

Zuhair Khayyat
Chief Technology Officer
Lucidya
 +966503418330
 lucidya.com

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-- 
Dr. Horst Düster
Managing Director
Sourcepole AG - Linux & Open Source Solutions 
Weberstrasse 5, 8004 Zürich, Switzerland
Tel: +41 (0)44 440 77 11
Direkt: +41 (0)44 515 67 70
horst.duester@sourcepole.ch  http://www.sourcepole.ch

qgiscloud.com - Karten einfach vom Desktop ins Netz

Am 21.01.19 um 12:19 schrieb Andrew Gierth:
> Note that there's a single pg_shdepend table shared between all
> databases in the cluster; it's not part of any single database but
> rather is a "global" table. So what matters is the total number of
> objects over all databases, not the size of any single db.
OK that declares the size of the table. We have more than 50'000
databases in one cluster.

Regards
Horst

-- 
Dr. Horst Düster
Managing Director
Sourcepole AG - Linux & Open Source Solutions 
Weberstrasse 5, 8004 Zürich, Switzerland
Tel: +41 (0)44 440 77 11
Direkt: +41 (0)44 515 67 70
horst.duester@sourcepole.ch  http://www.sourcepole.ch

qgiscloud.com - Karten einfach vom Desktop ins Netz