Re: Increase the size of shared_buffers in AWS RDS 10.11 postgreSQL

I have verified it already as per the calculation. The current shared
buffer is 2.5GB
(2694408/1024/1024).

Which I want to make it 8GB or 24G

How to update this is in AWS like below

SUM({DBInstanceClassMemory/12038},-50003)

On Thu, Jan 28, 2021, 22:37 John Scalia <jayknowsunix(at)gmail(dot)com> wrote:

> Ok, it took a me a bit to locate one of my servers that is the same size
> as yours. Now, I did not set this one up, I only inherited it, but it is
> configured the same as yours, i.e., using that same formula. When I log
> into it, however, and type: show shared_buffers; it reports 21555264kB. A
> db.r5.xlarge has 32 GB of memory according to AWS and by my calculations
> the value for shared_buffers is 20.56GB (21555264/1024/1024) Not quite the
> 75% value, but this is far greater than the 8GB you’re asking for. So, are
> you trying to limit it to this lower value, and have you queried yours to
> see what the shared_buffers is set to?
>
> Sent from my iPad
>
> On Jan 28, 2021, at 11:30 AM, dbatoCloud Solution <dbatocloud17(at)gmail(dot)com>
> wrote:
>
> 
> Hi,
> Ok Sure. But in the parameter group , i can see like this
> SUM({DBInstanceClassMemory/12038},-50003) . How to calculate it ? where
> should I update it . Should I do change it in 12038 value.
>
> What is meant by DBInstanceClassMemory? My RDS instance shape is "
> db.r5.xlarge". I am confused with this parameter?
>
> Can you please help me?
>
>
>
> Thanks & Best Wishes,
>
> Ashok
>
>
>
>
> ---------------------------------------------------------------------------------------------------------------------
>
> Ashokkumar Mani *(OCP12c/11g/10g/9i, AWS SAA, M103)*
>
> *Dubai** , UAE* *| BLR , INDIA*
>
> M: *+971 54 723 0075 *| *+91 90086 70302 | *WApp :* +91 81975 99922*
>
> W: https://dbatocloudsolution.blogspot.in/
> <http://dbatocloudsolution.blogspot.in/> | E: dbatocloud17(at)gmail(dot)com
>
>
> On Thu, Jan 28, 2021 at 9:44 PM John Scalia <jayknowsunix(at)gmail(dot)com>
> wrote:
>
>> Well, you should understand the AWS recommends a 75% setting, or 24GB in
>> their documentation. So, why don’t you just set the value as something like
>> that in your database parameter group settings.
>>
>>
>> Sent from my iPad
>>
>> On Jan 28, 2021, at 10:55 AM, dbatoCloud Solution <dbatocloud17(at)gmail(dot)com>
>> wrote:
>>
>> 
>> Hi John,
>> Yes, I calculated as per pgtune(https://pgtune.leopard.in.ua/#/)
>> advisor. I took 25% of physical memory 32GB in AWS RDS PostgreSQL which
>> is 8GB.
>>
>> AWS PostgreSQL Configuration: -
>>
>> <image.png>
>>
>>
>>
>> <image.png>
>>
>>
>>
>> How to update the shared_buffer into 8GB in the AWS RDS Parameter Group
>> here below?
>> <image.png>
>>
>>
>>
>>
>> Thanks & Best Wishes,
>>
>> Ashok
>>
>>
>>
>>
>> ---------------------------------------------------------------------------------------------------------------------
>>
>> Ashokkumar Mani *(OCP12c/11g/10g/9i, AWS SAA, M103)*
>>
>> *Dubai** , UAE* *| BLR , INDIA*
>>
>> M: *+971 54 723 0075 *| *+91 90086 70302 | *WApp :* +91 81975 99922*
>>
>> W: https://dbatocloudsolution.blogspot.in/
>> <http://dbatocloudsolution.blogspot.in/> | E: dbatocloud17(at)gmail(dot)com
>>
>>
>> On Thu, Jan 28, 2021 at 6:05 PM dbatoCloud Solution <
>> dbatocloud17(at)gmail(dot)com> wrote:
>>
>>> Hi All,
>>>
>>> I want to increase the size of shared_buffers in AWS RDS postgreSQL
>>> 10.11. When I see it in the DB parameter group in AWS it says
>>> "SUM({DBInstanceClassMemory/12038},-50003)" and at the instance level I
>>> see 2694408 .
>>>
>>> Please let me know how to calculate and change the value for 8GB?
>>>
>>>
>>>
>>>
>>>
>>> Thanks & Best Wishes,
>>>
>>> Ashok
>>>
>>>
>>>
>>>
>>> ---------------------------------------------------------------------------------------------------------------------
>>>
>>> Ashokkumar Mani *(OCP12c/11g/10g/9i, AWS SAA, M103)*
>>>
>>> *Dubai** , UAE* *| BLR , INDIA*
>>>
>>> M: *+971 54 723 0075 *| *+91 90086 70302 | *WApp :* +91 81975 99922*
>>>
>>> W: https://dbatocloudsolution.blogspot.in/
>>> <http://dbatocloudsolution.blogspot.in/> | E: dbatocloud17(at)gmail(dot)com
>>>
>>