Error creating index (v6.5)

I'm trying to create the third index in a table populated with 23000 rows
and I get :

sanluis=> CREATE INDEX art_idx2 ON ARTICULOINFO (shFamilia);
FATAL 1: btree: failed to add item to the page in _bt_sort (2)
pqReadData() -- backend closed the channel unexpectedly.
This probably means the backend terminated abnormally
before or while processing the request.
We have lost the connection to the backend, so further
processing is impossible. Terminating.

You're probably out of space in your .../pgsql/data/base directory.

I can add more index on the same table without problem using other columns,

The other columns probably generate smaller indices. The message you
get can be conceivably caused by more than one problem, but in all
cases that I saw it, it was because of the disk shortage.

--Gene

Roberto Moreda wrote:

sanluis=> CREATE INDEX art_idx2 ON ARTICULOINFO (shFamilia);
FATAL 1: btree: failed to add item to the page in _bt_sort (2)
pqReadData() -- backend closed the channel unexpectedly.
This probably means the backend terminated abnormally
before or while processing the request.
We have lost the connection to the backend, so further
processing is impossible. Terminating.

What happens?

have you inserted a large amount of data before ?
probably using copy ?
then try vacuum.

If that doesnt help try copying your data out, recreating table and
copying back in.
And don't forget to vacuum.

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