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create or replace function bad_tuples(relname regclass)
returns table (page int, ctid tid, sqlstate text, sqlerrm text)
as $$
declare
pages int;
page int;
ctid tid;
begin
select pg_relation_size(relname) / current_setting('block_size')::int into pages;
for page in 0 .. pages-1 loop
if page % 10000 = 0 then
raise notice '%: page % of %', relname, page, pages;
end if;
begin
for ctid in select t_ctid from heap_page_items(get_raw_page(relname::text, page)) loop
begin
execute format('SELECT length(t::text) FROM %s t WHERE ctid=%L', relname, ctid);
exception -- bad tuple
when others then
bad_tuples.page := page;
bad_tuples.ctid := ctid;
bad_tuples.sqlstate := sqlstate;
bad_tuples.sqlerrm := sqlerrm;
return next;
end;
end loop;
exception -- bad page
when undefined_function then
raise exception undefined_function
using message = SQLERRM,
hint = 'Use CREATE EXTENSION pageinspect; to create it';
when others then
bad_tuples.page := page;
bad_tuples.sqlstate := sqlstate;
bad_tuples.sqlerrm := sqlerrm;
return next;
end;
end loop;
end;
$$ language plpgsql;
comment on function bad_tuples(regclass) is
'return ctids of all tuples in a table that trigger an error';
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