BEGIN;
SET search_path = public;
CREATE OR REPLACE FUNCTION pg_buffercache_pages()
RETURNS SETOF RECORD
AS '$libdir/pg_buffercache', 'pg_buffercache_pages'
LANGUAGE C;
CREATE VIEW pg_buffercache AS
        SELECT P.* FROM pg_buffercache_pages() AS P
        (bufferid integer, relfilenode oid, reltablespace oid, reldatabase oid,
         relblocknumber int8, isdirty bool);
REVOKE ALL ON FUNCTION pg_buffercache_pages() FROM PUBLIC;
REVOKE ALL ON pg_buffercache FROM PUBLIC;

COMMIT;

ALTER TABLE pg_buffercache OWNER TO webbot;
GRANT SELECT, UPDATE, INSERT, DELETE, REFERENCES, RULE ON TABLE pg_buffercache TO webbot;

select * from pg_buffercache;