Oh,
thanks. I didn't know about index tables not having access to associated toast
values. The index access method is (at least in the textual part) similar to
GIN, however, I needed to do some changes to it. Saving the whole document is
actually only important for vacuum. I think, I will find some workaround to
solve this issue.
However, it is a little bit strange, that I get toasted values (when inserting
from another table) and untoasted values, if I insert items directly. Could
anybody please explain this to me?
Best regards
Carsten Kropf
Am 24.06.2010 um 16:20 schrieb Tom Lane:
> Carsten Kropf <ckro...@fh-hof.de> writes:
>> I have a strange issue using a custom built index structure. My index access
>> method support document type composed of words (as tsvector) and points
>> (1-dimensional arrays of them). For internal reasons, I have to save the
>> documents as a whole inside my structure (for proper reorganisations).
>> So, I form the tuples using index_form_tuple with the proper description.
>> Everything works fine, as long as the documents are quite small. However, if
>> the tsvector becomes too large, I run into a problem of not being able to
>> store the documents, because (obviously) the tsvector is too large for one
>> page.
>
> Well, of course. I think this is a fundamentally bad index design. You
> didn't say exactly what sort of searches you want this index type to
> accelerate, but perhaps you need a design closer to GIN, in which you'd
> make index entries for individual words not whole documents.
>
>> What I tried to solve this issue here, is to extract the words from the
>> document (in my index) and calling 'Datum toast_compress_datum(Datum
>> value)'in order to compress the tsvector into a proper toast table.
>
> Indexes don't have toast tables.
>
> regards, tom lane
>
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