Обсуждение: Indexes documentation bug
Hello,
I believe there is an error within this sentence in section https://www.postgresql.org/docs/current/monitoring-stats.html#MONITORING-PG-STAT-USER-FUNCTIONS-VIEW
"Therefore, a bitmap scan increments the
"Therefore, a bitmap scan increments the
pg_stat_all_indexes.idx_tup_read count(s) for the index(es) it uses, and it increments the pg_stat_all_tables.idx_tup_fetch count for the table, but it does not affect pg_stat_all_indexes.idx_tup_fetch."There is repeated mentioning of
pg_stat_all_indexes.idx_tup_fetch while I suppose one should read pg_stat_all_indexes.idx_scan instead the second time. I.e. bitmap scans do not increment idx_scan.Regards,
--
Kouber Saparev
Kouber Saparev <kouber@gmail.com> writes: > I believe there is an error within this sentence in section > https://www.postgresql.org/docs/current/monitoring-stats.html#MONITORING-PG-STAT-USER-FUNCTIONS-VIEW > "Therefore, a bitmap scan increments the > pg_stat_all_indexes.idx_tup_read count(s) > for the index(es) it uses, and it increments the pg_stat_all_tables. > idx_tup_fetch count for the table, but it does not affect > pg_stat_all_indexes.idx_tup_fetch." > There is repeated mentioning of pg_stat_all_indexes.idx_tup_fetch while I > suppose one should read pg_stat_all_indexes.idx_scan instead the second > time. I.e. bitmap scans do not increment idx_scan. Um ... you did notice that the mentions of idx_tup_fetch apply to two different views, pg_stat_all_tables vs pg_stat_all_indexes? regards, tom lane
My bad, yes indeed, the view is different.
На пн, 4.04.2022 г. в 17:01 ч. Tom Lane <tgl@sss.pgh.pa.us> написа:
Kouber Saparev <kouber@gmail.com> writes:
> I believe there is an error within this sentence in section
> https://www.postgresql.org/docs/current/monitoring-stats.html#MONITORING-PG-STAT-USER-FUNCTIONS-VIEW
> "Therefore, a bitmap scan increments the
> pg_stat_all_indexes.idx_tup_read count(s)
> for the index(es) it uses, and it increments the pg_stat_all_tables.
> idx_tup_fetch count for the table, but it does not affect
> pg_stat_all_indexes.idx_tup_fetch."
> There is repeated mentioning of pg_stat_all_indexes.idx_tup_fetch while I
> suppose one should read pg_stat_all_indexes.idx_scan instead the second
> time. I.e. bitmap scans do not increment idx_scan.
Um ... you did notice that the mentions of idx_tup_fetch apply to two
different views, pg_stat_all_tables vs pg_stat_all_indexes?
regards, tom lane