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

On Mar 13, 2011, at 12:05 PM, Dmitriy Igrishin wrote:

> 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.

This probably goes without saying, but you'll have to use col = md5('blahblahblahblah') in your qualifiers to get the benefit of the index.

--brian