Re: Difference between "autovacuum_naptime" and "autovacuum_vacuum_cost_delay"?

Thank you very much for your response.

Could you clarify me below things,please?

What is the difference between "autovacuum_naptime" and
"autovacuum_vacuum_cost_delay"?

What is the difference between "autovacuum launcher process" and
"autovacuum worker process"?

How to control the number of "autovacuum launcher process" and "autovacuum
worker process"?

Does "autovacuum launcher process" sleeps? If yes,which parameter controls
it?

Does "autovacuum worker process" sleeps? If yes,which parameter controls it?

Regards,
Raghavendra Rao

On 17 August 2018 at 09:30, Joshua D. Drake <jd(at)commandprompt(dot)com> wrote:

> On 08/16/2018 06:10 PM, Raghavendra Rao J S V wrote:
>
> Hi All,
>
> I have gone through several documents but I am still have confusion
> related to "autovacuum_naptime" and "autovacuum_vacuum_cost_delay". Could
> you clarify me with an example.
>
> When Auto vacuum worker process will start?
>
>
> Autovacuum checks for relations that need to be vacuumed/analyzed every
> "naptime"
>
> When Auto vacuum worker process will stop?
>
>
> When it is done with the list of relations that needed work that were
> found at the launch of "naptime"
>
>
> Does Auto vacuum worker process will sleep like Auto vacuum launcher
> process ?
>
>
> The launcher process sleeps for naptime, then wakes up to check what needs
> to be worked on
>
>
> What is the difference between Auto vacuum launcher process and Auto
> vacuum worker process?
>
>
> The launcher is the process that spawns the worker processes (I think).
>
> JD
>
>
>
>
> --
> Regards,
> Raghavendra Rao J S V
>
>
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--
Regards,
Raghavendra Rao J S V
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