Re: Slow select

From: yuliada <yuliada(at)gmail(dot)com>
To: pgsql-general(at)postgresql(dot)org
Subject: Re: Slow select
Date: 2009-12-17 01:18:12
Message-ID: 26821568.post@talk.nabble.com
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Sam Mason wrote:
>
> Wouldn't this be "lower(value) = lower(?)" ?
>

Yes, I use it as "lower(value) = lower(?)", I typed inaccurate example.

Sam Mason wrote:
>
> So each query is taking approx 300ms? How much data does each one
> return?
>

No more than 1000 rows.

Sam Mason wrote:
>
> How about combining all 1000 selects into one?
>

I can't combine these selects into one, I need to run them one after
another.

Grzegorz Jaśkiewicz wrote:
>
> show us explain select * ....
>

"Bitmap Heap Scan on bn_stringvalue v (cost=228.40..8688.70 rows=2172
width=90) (actual time=1129.767..1781.403 rows=104 loops=1)"
" Recheck Cond: (lower((value)::text) = 'esr'::text)"
" -> Bitmap Index Scan on idx_stringv (cost=0.00..227.86 rows=2172
width=0) (actual time=1107.974..1107.974 rows=104 loops=1)"
" Index Cond: (lower((value)::text) = 'esr'::text)"
"Total runtime: 1781.566 ms"

Thanks
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