Date: Mon, 24 Aug 2020 15:08:53 -0400
From: Alvaro Herrera <alvherre@2ndquadrant.com>
To: Wells Oliver <wells.oliver@gmail.com>
Cc: pgsql-admin <pgsql-admin@postgresql.org>
Subject: Re: Odd pg dump error: cache lookup failure
Message-ID: <20200824190853.GA14456@alvherre.pgsql>
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On 2020-Aug-24, Wells Oliver wrote:

> 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?

-- 
Álvaro Herrera                https://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services