First thing I would do is checking wether the relation exists (e.g. by
checking pg_class for the relfilenode of the relation and then finding
it physically in PGDATA folder) or checking wether the file is
corrupted for example by finding the name and type of the relation and
trying to make some manipulation involving it (e.g. selecting data if
it is a table).
2010/9/21 Benjamin Arai, Ph.D. <benjamin@araisoft.com>:
> Hello,
>
> The server is still running but pg_dumps output the following error. What
> should I do?
>
> Thanks,
> Benjamin
>
> OUTPUT:
>
> pg_dump: SQL command failed
> pg_dump: Error message from server: ERROR: cache lookup failed for index
> 1531353157
> pg_dump: The command was: SELECT t.tableoid, t.oid, t.relname as indexname,
> pg_catalog.pg_get_indexdef(i.indexrelid) as indexdef, t.relnatts as
> indnkeys, i.indkey, i.indisclustered, c.contype, c.conname, c.tableoid as
> contableoid, c.oid as conoid, (SELECT spcname FROM pg_catalog.pg_tablespace
> s WHERE s.oid = t.reltablespace) as tablespace FROM pg_catalog.pg_index i
> JOIN pg_catalog.pg_class t ON (t.oid = i.indexrelid) LEFT JOIN
> pg_catalog.pg_depend d ON (d.classid = t.tableoid AND d.objid = t.oid AND
> d.deptype = 'i') LEFT JOIN pg_catalog.pg_constraint c ON (d.refclassid =
> c.tableoid AND d.refobjid = c.oid) WHERE i.indrelid =
> '1531340182'::pg_catalog.oid ORDER BY indexname
--
Łukasz Brodziak
II MU Bioinformatyka