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Re: Values larger than 1/3 of a buffer page cannot be indexed. - Mailing list pgsql-general

From Dmitriy Igrishin
Subject Re: Values larger than 1/3 of a buffer page cannot be indexed.
Date
Msg-id AANLkTikG_nHARKr9qeQXpS7Q6QXgJvuFUi6Wxpd0o7H7@mail.gmail.com
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In response to Values larger than 1/3 of a buffer page cannot be indexed.  (Viktor Nagy <viktor.nagy@toolpart.hu>)
Responses Re: Values larger than 1/3 of a buffer page cannot be indexed.  (Brian Hirt <bhirt@me.com>)
Re: Values larger than 1/3 of a buffer page cannot be indexed.  (Viktor Nagy <viktor.nagy@toolpart.hu>)
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Hey Viktor,

2011/3/13 Viktor Nagy <viktor.nagy@toolpart.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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