Re: Vacuum and state_change

> On Jun 9, 2017, at 11:01 AM, Adrian Klaver <adrian(dot)klaver(at)aklaver(dot)com> wrote:
>
> On 06/09/2017 08:45 AM, armand pirvu wrote:
>> Hi
>> Had a couple of processes blocking the vacuum so I terminated them using
>> select pg_terminate_backend(pid);
>> Running the following
>> select distinct pid, backend_start, query_start, state_change, state, query from pg_catalog.pg_stat_activity order by 1;
>> pid | backend_start | query_start | state_change | state | query
>> -------+-------------------------------+-------------------------------+-------------------------------+--------+--------------------------------------------------------------------------------------------------------------------------
>> 10677 | 2017-06-09 10:25:49.189848-05 | 2017-06-09 10:33:43.598805-05 | 2017-06-09 10:33:43.599091-05 | idle | SELECT 1
>> 11096 | 2017-06-09 10:27:03.686588-05 | 2017-06-09 10:33:56.28736-05 | 2017-06-09 10:33:56.287364-05 | active | select distinct pid, backend_start, query_start, state_change, state, query from pg_catalog.pg_stat_activity order by 1;
>> 13277 | 2017-06-09 07:48:49.506686-05 | 2017-06-09 07:48:52.887185-05 | 2017-06-09 07:48:52.887188-05 | active | autovacuum: VACUUM csischema.tf_purchased_badge
>> 13484 | 2017-06-09 10:31:54.127672-05 | 2017-06-09 10:33:47.137938-05 | 2017-06-09 10:33:47.138226-05 | idle | SELECT 1
>> 16886 | 2017-06-09 07:56:49.033893-05 | 2017-06-09 07:56:49.078369-05 | 2017-06-09 07:56:49.078371-05 | active | autovacuum: VACUUM csischema.tf_purchases_person
>> 25387 | 2017-06-09 05:32:08.079397-05 | 2017-06-09 05:32:08.385728-05 | 2017-06-09 05:32:08.385731-05 | active | autovacuum: VACUUM csischema.tf_demographic_response_person
>> 37465 | 2017-06-09 08:50:58.992002-05 | 2017-06-09 08:51:21.506829-05 | 2017-06-09 08:51:21.506831-05 | active | autovacuum: VACUUM csischema.tf_transaction_item_person
>> I did notice that state_change did not change one bit
>
> Did the state change?
>

No and that was what got me worried

>> Does that mean that something is not quite right with the vacuums ?
>
> Might want to take a look at:
>
> https://www.postgresql.org/docs/9.6/static/monitoring-stats.html#PG-STAT-ALL-TABLES-VIEW <https://www.postgresql.org/docs/9.6/static/monitoring-stats.html#PG-STAT-ALL-TABLES-VIEW>
>
>
>> Thank you
>> Armand
>
>
> --
> Adrian Klaver
> adrian(dot)klaver(at)aklaver(dot)com <mailto:adrian(dot)klaver(at)aklaver(dot)com>