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Re: Identical query on two machines, different plans....

From: Csaba Nagy <nagy(at)ecircle-ag(dot)com>
To: mario(dot)splivalo(at)mobart(dot)hr
Cc: Pgsql performance <pgsql-performance(at)postgresql(dot)org>
Subject: Re: Identical query on two machines, different plans....
Date: 2006-04-20 13:59:48
Message-ID: 1145541587.3553.30.camel@coppola.muc.ecircle.de (view raw or flat)
Thread:
Lists: pgsql-performance
You very likely forgot to run ANALYZE on your laptop after copying the
data. Observe the different row count estimates in the 2 plans...

HTH,
Csaba.


> QUERY PLAN
> ---------------------------------------------------------------------------------------------------------------------------------------------------
>  Index Scan using ticketing_codes_uq_value_group_id on ticketing_codes
> (cost=0.00..6.02 rows=1 width=4) (actual time=0.104..0.107 rows=1
                                                             ^^^^^^ 
> loops=1)
>    Index Cond: (((code_value)::text = 'C7ZP2U'::text) AND (code_group_id
> = 1000))
>  Total runtime: 0.148 ms
> (3 rows)
> 
> 
> PLAN 
> ----------------------------------------------------------------------------------------------------------------------------------------------
>  Bitmap Heap Scan on ticketing_codes  (cost=2.01..1102.05 rows=288
                                                            ^^^^^^^^
> width=4) (actual time=88.164..88.170 rows=1 loops=1)
>    Recheck Cond: (((code_value)::text = 'C7ZP2U'::text) AND
> (code_group_id = 1000))
>    ->  Bitmap Index Scan on ticketing_codes_uq_value_group_id
> (cost=0.00..2.01 rows=288 width=0) (actual time=54.397..54.397 rows=1
> loops=1)
>          Index Cond: (((code_value)::text = 'C7ZP2U'::text) AND
> (code_group_id = 1000))
>  Total runtime: 88.256 ms
> (5 rows)
> 



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