Re: Optimizer(?) off by factor of 3 ... ?

From: "Marc G(dot) Fournier" <scrappy(at)hub(dot)org>
To: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Cc: pgsql-hackers(at)postgresql(dot)org
Subject: Re: Optimizer(?) off by factor of 3 ... ?
Date: 2002-02-12 02:23:03
Message-ID: 20020211222159.N59276-100000@mail1.hub.org
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the postgresql.conf file ... for testing, I used 'set enable_seqscan'
after the server was live to turn on/off, this is just hte default ...

tcpip_socket = true
max_connections = 200 # 1-1024
port = 5434
sort_mem = 4024
shared_buffers = 32768
fsync = false
wal_buffers = 32
debug_pretty_print = true
enable_seqscan = false

On Mon, 11 Feb 2002, Tom Lane wrote:

> I'm trying to work out how the planner arrived at the numbers you're
> showing; the hashjoin cost estimate seems a little lower than I'd
> expect. Are you using nonstandard values for any of the planner cost
> factors? (cpu_operator_cost, etc) How about sort_mem?
>
> regards, tom lane
>

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