On 2021-12-11 06:00:40 +0500, Дмитрий Иванов wrote: > Afternoon. I was able to make the necessary changes to my base needed to > migrate win_pg12 to debian pg14. > But there is a new problem, which was not there at the initial stage so I > checked: > > win_pg12: > -> Index Scan using index_class_tree_full on class c (cost=0.28..2.50 rows=1 > width=235) (actual time=0.030..0.032 rows=1 loops=1) > Index Cond: (id = 650) > debian_pg14: > -> Index Scan using index_class_tree_full on class c (cost=0.28..2.50 rows=1 > width=235) (actual time=842.795..842.796 rows=1 loops=1) > Index Cond: (id = 650)
Is this repeatable or did it just occur once?
32 µs to retrieve a single row via index probably means that it was
already cached in RAM
842796 µs to retrieve a single row via index doesn't even look realistic
for a completely cold database on a slow rotating hard disk. If this
happened only once I suspect that something else interfered (maybe
another I/O intensive process, if this is on a VM maybe even on another
guest). If it is repeatable, something very weird is going on.
hp
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