Re: Values larger than 1/3 of a buffer page cannot be indexed.

From: Dmitriy Igrishin <dmitigr(at)gmail(dot)com>
To: Viktor Nagy <viktor(dot)nagy(at)toolpart(dot)hu>
Cc: pgsql-general(at)postgresql(dot)org
Subject: Re: Values larger than 1/3 of a buffer page cannot be indexed.
Date: 2011-03-13 18:05:14
Message-ID: AANLkTikG_nHARKr9qeQXpS7Q6QXgJvuFUi6Wxpd0o7H7@mail.gmail.com
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Hey Viktor,

2011/3/13 Viktor Nagy <viktor(dot)nagy(at)toolpart(dot)hu>

> hi,
>
> when trying to insert a long-long value, I get the following error:
>
> index row size 3120 exceeds maximum 2712 for index "ir_translation_ltns"
> HINT: Values larger than 1/3 of a buffer page cannot be indexed.
> Consider a function index of an MD5 hash of the value, or use full text
> indexing.
>
> is there a way to generate this recommended function index of an md5 hash
> on an already existing database and tables (filled with data)?
>
Just create index this way, e.g.
CREATE INDEX ir_translation_ltns ON tab ((md5(col)));
where "tab" and "col" are table and column of which you want
to create btree index.

>
> thanks,
> Viktor
>

--
// Dmitriy.

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