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

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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