Hi All
I´ve ft_simple_core_content_content_idx
ON core_content
USING gin
(to_tsvector('simple'::regconfig, content) );
If I´m seaching for a word which is NOT in the column content the query plan
and the execution time differs with the given limit.
If I choose 3927 or any higher number the query execution took only few
milliseconds.
core_content content where
to_tsvector('simple', content.content) @@ tsquery(plainto_tsquery('simple',
'asdasdadas') :: varchar || ':*')=true
Limit 3927
"Limit (cost=0.00..19302.23 rows=3926 width=621) (actual
time=52147.149..52147.149 rows=0 loops=1)"
" -> Seq Scan on core_content content (cost=0.00..98384.34 rows=20011
width=621) (actual time=52147.147..52147.147 rows=0 loops=1)"
" Filter: (to_tsvector('simple'::regconfig, content) @@
'''asdasdadas'':*'::tsquery)"
"Total runtime: 52147.173 ms"
Is there any posibility to improve the performance even if the limit is only
10? Is it possible to determine that the query optimizer takes only the fast
bitmap heap scan instead of the slow seq scan?
Regards,
Bill Martin
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