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Re: Re: [BUGS] BUG #3965: UNIQUE constraint fails on long column values

From: Bruce Momjian <bruce(at)momjian(dot)us>
To: Gurjeet Singh <singh(dot)gurjeet(at)gmail(dot)com>
Cc: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Phil Frost <phil(at)macprofessionals(dot)com>, PostgreSQL-documentation <pgsql-docs(at)postgresql(dot)org>
Subject: Re: Re: [BUGS] BUG #3965: UNIQUE constraint fails on long column values
Date: 2008-03-05 18:36:26
Message-ID: 200803051836.m25IaQl06279@momjian.us (view raw or flat)
Thread:
Lists: pgsql-bugspgsql-docs
Gurjeet Singh wrote:
> On Wed, Mar 5, 2008 at 10:39 PM, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
> 
> > Bruce Momjian <bruce(at)momjian(dot)us> writes:
> > > Part of the problem is we don't know the length --- it is the compressed
> > > length that is limited, I think to 8k.
> >
> > That's a problem, and the length limit is different for different index
> > types.  So you're really not going to be able to say anything very
> > specific.  Another problem is where would you put the information?
> 
> 
> In 'CREATE INDEX'  docs...
> 
> http://www.postgresql.org/docs/8.3/interactive/sql-createindex.html
> 
> Along with the following statement:
> 
> method: The name of the index method to be used. Choices are btree, hash,
> gist, and gin. The default method is btree.

We are trying to figure out how to specify the index-type-specific length
limits, not the index types themselves.

-- 
  Bruce Momjian  <bruce(at)momjian(dot)us>        http://momjian.us
  EnterpriseDB                             http://postgres.enterprisedb.com

  + If your life is a hard drive, Christ can be your backup. +

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