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
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:
Show quoted text
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