12.4. Both of those queries return no rows, with and without those options set.
We do do some nightly processing of data during the same window, in which views are re-materialized: would that cause this issue? No non-temporary tables are dropped or re-created, though.
> My pg_dump scripts have been bombing lately, and this is the error I see a > bit into the backup process: > > pg_dump: error: query failed: ERROR: cache lookup failed for attribute 1 > of relation 1152770777
What pg version is this, and can you run the query directly using psql and have it throw the same error? What do select * from pg_class where oid = '1152770777' and select * from pg_attribute where attrelid = '1152770777' show? If the latter fails to show an entry for attnum=1, does it magically appear if you do SET enable_indexscan=off; SET enable_bitmapscan=off; prior to running the query?