"himanshu.joshi" <himanshu.joshi@orkash.com> writes:
> I am facing a strange problem while taking dump of a postgres
> database using pg_dump.
> whenever I start the pg_dump command to take the backup of that
> particular database, it stops within few minutes with the below
> mentioned error:
> *[root@s8-msd-2 bin]# ./pg_dump -Upostgres pdc_uima_dummy >
> /hdd2-1/pdc_uima_dummy_108_18092012.sql
> pg_dump: SQL command failed
> pg_dump: Error message from server: ERROR: invalid memory alloc request
> size 18446744073709551613
> pg_dump: The command was: COPY public.object_data (id, wkb_geometry,
> obj_type_id, obj_beginoffset, obj_endoffset, source_id, sentence_id,
> last_mod_date, obj_norm_value, obj_text, entity_name, frequency) TO
> stdout;*
This looks like a data corruption issue -- that is, there's some row in
that table that contains a damaged variable-width field, such that the
system is computing a silly value for the width of the field. You need
to find and remove the damaged row(s).
regards, tom lane