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Re: Postgres scalability and performance on windows

From: "Gopal" <gopal(at)getmapping(dot)com>
To: <pgsql-performance(at)postgresql(dot)org>,<pgsql-general(at)postgresql(dot)org>
Subject: Re: Postgres scalability and performance on windows
Date: 2006-11-24 10:11:57
Message-ID: (view raw or flat)
Lists: pgsql-generalpgsql-performance

Thanks for your suggestions. Here's an output of the explain analyse.
I'll change the shared_buffers and look at the behaviour again.

"Limit  (cost=59.53..59.53 rows=1 width=28) (actual time=15.681..15.681
rows=1 loops=1)"
"  ->  Sort  (cost=59.53..59.53 rows=1 width=28) (actual
time=15.678..15.678 rows=1 loops=1)"
"        Sort Key: ceil(subq.percentcover), (1::double precision /
"        ->  Hash Join  (cost=58.19..59.52 rows=1 width=28) (actual
time=15.630..15.663 rows=2 loops=1)"
"              Hash Cond: ("outer".datasetid = "inner".did)"
"              ->  Seq Scan on tbl_metadata_dataset ds  (cost=0.00..1.21
rows=21 width=24) (actual time=0.006..0.021 rows=21 loops=1)"
"              ->  Hash  (cost=58.18..58.18 rows=1 width=12) (actual
time=15.591..15.591 rows=2 loops=1)"
"                    ->  Sort  (cost=58.17..58.17 rows=1 width=117)
(actual time=15.585..15.586 rows=2 loops=1)"
"                          Sort Key: tbl_metadata_chunks.datasetid"
"                          ->  HashAggregate  (cost=58.13..58.16 rows=1
width=117) (actual time=15.572..15.573 rows=2 loops=1)"
"                                ->  Hash IN Join  (cost=3.34..58.10
rows=7 width=117) (actual time=0.261..0.544 rows=50 loops=1)"
"                                      Hash Cond: ("outer".datasetid =
"                                      ->  Bitmap Heap Scan on
tbl_metadata_chunks  (cost=2.05..56.67 rows=14 width=117) (actual
time=0.204..0.384 rows=60 loops=1)"
"                                            Filter: (chunkgeometry &&
8BF7700CC99FA68494058631EDF87ECC1BF608F3D1 (..)"
"                                            ->  Bitmap Index Scan on
tbl_metadata_chunks_idx3  (cost=0.00..2.05 rows=14 width=0) (actual
time=0.192..0.192 rows=60 loops=1)"
"                                                  Index Cond:
(chunkgeometry &&
8BF7700CC99FA68494058631EDF87ECC (..)"
"                                      ->  Hash  (cost=1.26..1.26
rows=10 width=4) (actual time=0.037..0.037 rows=10 loops=1)"
"                                            ->  Seq Scan on
tbl_metadata_dataset  (cost=0.00..1.26 rows=10 width=4) (actual
time=0.005..0.024 rows=10 loops=1)"
"                                                  Filter: (typeofdataid
= 1)"
"Total runtime: 15.871 ms"



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