UNLOGGED evade duping the whole target table and could reduce
the amount of WAL to be emitted (caused by the difference of
tuple-based WAL and per-page WAL) (in major cases).
Could you try it and see if it works for you in any extent?
regards.
[1] https://commitfest.postgresql.org/38/3461/
--
Ky
he
both hands of a join are on the same foreign server. Tthis is not the
case since the inner subquery is not even a foreign scan. The planner
doesn't consider the possibility that a subquery is executable
anywhere.
As the result, the local inevitably draw all rows from remote table to
join with the result of the subquery on-local, which should be quite
slow.
It could be improved, but I don't think we are going to consider that
case because the SLOW query seems like a kind of bad query, which can
be improved by rewriting to the FAST one.
regards.
--
Kyotaro Horiguchi
NTT Open Source Software Center
lly queries run fast and with low
> >> cost when ran from Database 'psql' or pgadmin. However when called from API
> >> Average Time in pg_stat_statements shows more than 1 second. When Load test
> >> runs these queries get concurrently called ,response time beomes poor with
> >> more load. Could this be due to Lockings.
> >>
> >>
> >> I checked pg_locks and I see the below records. Query that I used is also
> >> given below. I could see few ExclusiveLocks for "virtualxid" records and
> >> for queries with CTEs(WITH Clause). Please advise
> >>
> >>
> >>
> >> SELECT * FROM pg_locks pl LEFT JOIN pg_stat_activity psa
> >> ON pl.pid = psa.pid;
You would find that the "granted" column in all the rows from pg_locks
is "true", that is, no one is waiting on a lock. That slowdown doesn't
at least seem coming from lock conflict.
regards.
--
Kyotaro Horiguchi
NTT Open Source Software Center
to preserve WAL files
up to about 68GB (in the case where checkpoint_timeout is 5 minutes)
so requirement of 7GB by restart_lsn doesn't matter.
In short, I don't think you need to do something against that "lag".
regards.
--
Kyotaro Horiguchi
NTT Open Source Software Center
d)
where rt.thesaurus_id = $1
union
...
$$ language sql;
explain analyze select c.version_id
from hitlist_rows_103710241 h,
lateral the_view(h.objectid) as c;
regards.
--
Kyotaro Horiguchi
NTT Open Source Software Center
