Re: index row requires 10040 bytes, maximum size is 8191

"Joshua D. Drake" <jd@commandprompt.com> writes:
> On Sat, 2010-11-13 at 09:48 +0800, Craig Ringer wrote:
>> Thoughts, folks? Does this matter in practice, since anything you'd want
>> to index will in practice be small enough or a candidate for full-text
>> indexing?

> I have run into this problem maybe 3 times in my whole career, precisely
> because if you are dealing with text that big, you move to full text
> search.

Yeah, the real question here is exactly what do you think a btree index
on a large text column will get you?  It seems fairly unlikely that
either simple equality or simple range checks are very useful for such
data.  I guess there's some use case for uniqueness checks, which we've
seen people approximate by unique-indexing the md5 hash of the column
value.

BTW, the 8K limit applies after possible in-line compression, so the
actual data value causing the failure was likely considerably longer
than 10K.

            regards, tom lane