Re: Terribly slow query with very good plan?

> >
> > It does not help.
>
> What if you try applying the C collation to the values from the table:
>
> where fi.is_active and fi.relpath collate "C" ^@ 'A'
>

Slow

EXPLAIN (ANALYZE, COSTS, VERBOSE, BUFFERS)
select fi.id from media.oo_file fi
where fi.is_active and fi.relpath collate "C" ^@ 'A' limit 1;
QUERY PLAN
|
--------------------------------------------------------------------------------------------------------------------------+
Limit (cost=0.00..1904.09 rows=1 width=8) (actual time=3837.338..3837.340
rows=0 loops=1) |
Output: id
|
Buffers: shared hit=9355 read=121908
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-> Seq Scan on media.oo_file fi (cost=0.00..144710.65 rows=76 width=8)
(actual time=3837.336..3837.336 rows=0 loops=1)|
Output: id
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Filter: (fi.is_active AND ((fi.relpath)::text ^@ 'A'::text))
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Rows Removed by Filter: 1075812
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Buffers: shared hit=9355 read=121908
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Planning Time: 0.391 ms
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Execution Time: 3837.364 ms
|