Обсуждение: PostgreSQL Full Vacuum Taking 5 to 6 hrs.

Hi,

On Tue, Feb 08, 2022 at 06:25:01AM +0000, Ram Pratap Maurya wrote:
>
> We are using Postgres -11 version and when we running Full vacuum it will
> take 5 to 6 Hrs to complete full vacuum.

What do you mean by "full vacuum" exactly?  Is it a plain VACUUM FULL?  If yes,
on all tables or only some specific ones?

Hi Julien,

we are running VACUUM FULL on all table and its take 5 to 6 Hrs.



Regards,
Ram Pratap.

-----Original Message-----
From: Julien Rouhaud [mailto:rjuju123@gmail.com]
Sent: 08 February 2022 12:23
To: Ram Pratap Maurya
Cc: 'pgsql-admin@lists.postgresql.org'; Ashish Chugh
Subject: Re: PostgreSQL Full Vacuum Taking 5 to 6 hrs.

Hi,

On Tue, Feb 08, 2022 at 06:25:01AM +0000, Ram Pratap Maurya wrote:
>
> We are using Postgres -11 version and when we running Full vacuum it
> will take 5 to 6 Hrs to complete full vacuum.

What do you mean by "full vacuum" exactly?  Is it a plain VACUUM FULL?  If yes, on all tables or only some specific
ones?

Hi,

Please don't top post on those forums
(https://wiki.postgresql.org/wiki/Mailing_Lists#Email_etiquette_mechanics)

On Tue, Feb 08, 2022 at 06:59:07AM +0000, Ram Pratap Maurya wrote:
> 
> we are running VACUUM FULL on all table and its take 5 to 6 Hrs.

The only thing that can be done to make it faster is to use a 1GB
maintenance_work_mem.

But why do you need to do frequent database wide VACUUM FULL in the first
place?  Do you really have massive bloat on every single table in the database?

Do you have adequate autovacuum configuration, or additional VACUUM jobs if
that's not enough?

HI Julien,

In my current database index size is very large compare than table (if table size is 30 GB and index size is 90GB) ,
thatwhy We running full vacuum monthly basis to increase the system performance and data reclaim . 
Auto Vacuum is also configuration in system.
As per your suggesion if we increase " maintenance_work_mem " paramater size to 1GB this will be help to improve full
vacuumperformance?. 

System configuration as below:

CPU - 42
RAM -70GB



Regards,
Ram Pratap.

-----Original Message-----
From: Julien Rouhaud [mailto:rjuju123@gmail.com]
Sent: 08 February 2022 12:38
To: Ram Pratap Maurya
Cc: 'pgsql-admin@lists.postgresql.org'; Ashish Chugh
Subject: Re: PostgreSQL Full Vacuum Taking 5 to 6 hrs.

Hi,

Please don't top post on those forums
(https://wiki.postgresql.org/wiki/Mailing_Lists#Email_etiquette_mechanics)

On Tue, Feb 08, 2022 at 06:59:07AM +0000, Ram Pratap Maurya wrote:
>
> we are running VACUUM FULL on all table and its take 5 to 6 Hrs.

The only thing that can be done to make it faster is to use a 1GB maintenance_work_mem.

But why do you need to do frequent database wide VACUUM FULL in the first place?  Do you really have massive bloat on
everysingle table in the database? 

Do you have adequate autovacuum configuration, or additional VACUUM jobs if that's not enough?

HI Julien,

In my current database index size is very large compare than table (if table size is 30 GB and index size is 90GB) ,
thatwhy We running full vacuum monthly basis to increase the system performance and data reclaim . 
Auto Vacuum is also configuration in system.
" maintenance_work_mem " paramater size to 2GB configure in system.


System configuration as below:

CPU - 42
RAM -70GB



Regards,
Ram Pratap.

-----Original Message-----
From: Julien Rouhaud [mailto:rjuju123@gmail.com]
Sent: 08 February 2022 12:38
To: Ram Pratap Maurya
Cc: 'pgsql-admin@lists.postgresql.org'; Ashish Chugh
Subject: Re: PostgreSQL Full Vacuum Taking 5 to 6 hrs.

Hi,

Please don't top post on those forums
(https://wiki.postgresql.org/wiki/Mailing_Lists#Email_etiquette_mechanics)

On Tue, Feb 08, 2022 at 06:59:07AM +0000, Ram Pratap Maurya wrote:
>
> we are running VACUUM FULL on all table and its take 5 to 6 Hrs.

The only thing that can be done to make it faster is to use a 1GB maintenance_work_mem.

But why do you need to do frequent database wide VACUUM FULL in the first place?  Do you really have massive bloat on
everysingle table in the database? 

Do you have adequate autovacuum configuration, or additional VACUUM jobs if that's not enough?

Maybe your database is really big.
Maybe your storage subsystem is really slow.
Maybe you're only running one thread.
Maybe it's being blocked by other users.

We don't know because you've barely told us anything.

Not to mention: VACUUM FULL is only useful after you've updated or deleted a major portion of a table all at once.

HI Julien,

In my current database index size is very large compare than table (if table size is 30 GB and index size is 90GB) , that why We running full vacuum monthly basis to increase the system performance and data reclaim .
Auto Vacuum is also configuration in system.
As per your suggesion if we increase " maintenance_work_mem " paramater size to 1GB this will be help to improve full vacuum performance?.

System configuration as below:

CPU - 42 
RAM -70GB



Regards,
Ram Pratap.

-----Original Message-----
From: Julien Rouhaud [mailto:rjuju123@gmail.com] 
Sent: 08 February 2022 12:38
To: Ram Pratap Maurya
Cc: 'pgsql-admin@lists.postgresql.org'; Ashish Chugh
Subject: Re: PostgreSQL Full Vacuum Taking 5 to 6 hrs.

Hi,

Please don't top post on those forums
(https://wiki.postgresql.org/wiki/Mailing_Lists#Email_etiquette_mechanics)

On Tue, Feb 08, 2022 at 06:59:07AM +0000, Ram Pratap Maurya wrote:

we are running VACUUM FULL on all table and its take 5 to 6 Hrs.

The only thing that can be done to make it faster is to use a 1GB maintenance_work_mem.

But why do you need to do frequent database wide VACUUM FULL in the first place?  Do you really have massive bloat on every single table in the database?

Do you have adequate autovacuum configuration, or additional VACUUM jobs if that's not enough?