Re: effective_cache_size X shared_buffer

On Mon, Apr 3, 2017 at 1:33 PM, Patrick B <patrickbakerbr(at)gmail(dot)com> wrote:

> 2017-04-03 13:23 GMT+12:00 Patrick B <patrickbakerbr(at)gmail(dot)com>:
>
>> Hi guys.
>>
>> I'm thinking about increasing the query cache for my PG 9.2 server.
>> I've got a project happening, which is doing lots and lots of writes and
>> reads during the night, and in the morning I see PG cache warming up again,
>> as all the cache "was used" by those write and read tasks.
>>
>> So my environment gets very slow for a few hours, until the queries used
>> on a daily basis go to the cache.
>>
>> Question:
>> Should I increase effective_cache_size or shared_buffer? What's the
>> difference between them?
>>
>> Thanks
>> Patrick
>>
>
> Can I also increase shared_buffer on my slave only? Would that make any
> difference if using selects on the slave? Or this parameter must be the
> same across all servers (Master/slaves) ?
>

Yes, you can increase the shared_buffers in the slave database.
Configuration can be different across master and slave databases.

Regards,

Venkata B N
Database Consultant