From: Sue Fitt <sue@inf.ed.ac.uk>
To: pgsql-performance@postgresql.org
Subject: Re: setting up foreign keys
Date: Thu, 10 Aug 2006 10:04:55 +0100
Message-ID: <44DAF6B7.1090800@inf.ed.ac.uk> (raw)
In-Reply-To: <44DAEB04.9050306@gmail.com>
References: <44DAE8CF.1030107@inf.ed.ac.uk>
<44DAEB04.9050306@gmail.com>
Thanks Chris and Chris, you've solved it.
I had a gui open that connects to the database. It was doing nothing
(and not preventing me adding to or altering headwords_core via psql),
but having closed it the table is instantly created. Weird.
BTW, referencing the same column twice is deliberate, it's a
cross-reference.
Sue
Chris Mair wrote:
>> This is my first post to the performance list, I hope someone can
help me.
>>
>> I'm setting up a table with 2 columns, both of which reference a
column in another table:
>>
>> CREATE TABLE headwords_core_lexemes (
>> core_id int REFERENCES headwords_core(core_id),
>> lexeme_id int REFERENCES headwords_core(core_id),
>> );
>>
>> Trouble is, it's taken 18 hours and counting! The table
headwords_core only has about 13,000 lines, and core_id is the primary
key on that table. However, I assume it must be those 13,000 lines that
are the problem, since if I try it referencing a similar table with 360
lines the new table is created almost instantly.
>>
>
> Hi,
>
> the 13000 rows in headwords_core don't matter at all for what this
> statement concerns. I bet you have another idle transaction that keeps
> headwords_core locked, for example because you did an
> alter table headwords_core there...
>
> Bye,
> Chris.
>
>
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To: pgsql-performance@postgresql.org
Cc: sue@inf.ed.ac.uk
Subject: Re: setting up foreign keys
In-Reply-To: <44DAF6B7.1090800@inf.ed.ac.uk>
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