On 08/16/2018 09:42 PM, Raghavendra Rao J S V wrote:
Thank you very much for your response.
Could you clarify me below things,please?
The docs can:
https://www.postgresql.org/docs/10/static/routine-vacuuming.html#AUTOVACUUM
https://www.postgresql.org/docs/10/static/runtime-config-autovacuum.html
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@xxxxxxxxxxxxxxxxx
<mailto:jd@xxxxxxxxxxxxxxxxx>> 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
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Regards,
Raghavendra Rao J S V
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