Обсуждение: Drop Schema Error

"Bradley Holbrook" <operations_bradley@servillian.ca> writes:
> DROP SCHEMA "_old_permissions" CASCADE;
> NOTICE:  drop cascades to 2 other objects
> DETAIL:  drop cascades to function 17059
> drop cascades to function 17060
> [Err] ERROR:  cache lookup failed for function 17060

> What is this trying to tell me?

Apparently you've got some dangling references in pg_depend, ie those
functions were dropped already but the pg_depend entries for them were
not cleaned up.

We've heard similar reports before (usually about temp tables not
functions, IIRC) but never been able to reproduce them or identify a
cause.  What PG version is this?  Have you done anything funny to that
schema or its contents, or had any crashes around the time of
manipulating either?

As far as cleaning up goes, the thing to do would be to manually delete
the relevant pg_depend entries --- for this one, an entry with objid =
17060 is probably what you're looking for.  But it would be good to try
to figure out how you got into this state first.

            regards, tom lane

"Bradley Holbrook" <operations_bradley@servillian.ca> writes:
> I renamed the schema from permissions to _old_permissions and I believe this caused the error.

Uh, no, certainly not.  pg_depend only cares about the objects' OIDs,
not their names.  Testing in 8.3, it works fine:

regression=# create schema old_permissions;
CREATE SCHEMA
regression=# create function old_permissions.foo() returns int as
regression-# 'select 2+2' language sql;
CREATE FUNCTION
regression=# create function old_permissions.foo2(int) returns int as
'begin return $1 + 1; end' language plpgsql;
CREATE FUNCTION
regression=# alter schema old_permissions rename to "_old_permissions";
ALTER SCHEMA
regression=# DROP SCHEMA "_old_permissions" ;
NOTICE:  function _old_permissions.foo2(integer) depends on schema _old_permissions
NOTICE:  function _old_permissions.foo() depends on schema _old_permissions
ERROR:  cannot drop schema _old_permissions because other objects depend on it
HINT:  Use DROP ... CASCADE to drop the dependent objects too.
regression=# DROP SCHEMA "_old_permissions" CASCADE;
NOTICE:  drop cascades to function _old_permissions.foo2(integer)
NOTICE:  drop cascades to function _old_permissions.foo()
DROP SCHEMA
regression=#

As I said, we've never seen a reproducible example.

            regards, tom lane