This file is indexed.

/usr/share/postgres-xc/extension/pg_buffercache--1.0.sql is in postgres-xc-contrib 1.1-2ubuntu2.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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/* contrib/pg_buffercache/pg_buffercache--1.0.sql */

-- complain if script is sourced in psql, rather than via CREATE EXTENSION
\echo Use "CREATE EXTENSION pg_buffercache" to load this file. \quit

-- Register the function.
CREATE FUNCTION pg_buffercache_pages()
RETURNS SETOF RECORD
AS 'MODULE_PATHNAME', 'pg_buffercache_pages'
LANGUAGE C;

-- Create a view for convenient access.
CREATE VIEW pg_buffercache AS
	SELECT P.* FROM pg_buffercache_pages() AS P
	(bufferid integer, relfilenode oid, reltablespace oid, reldatabase oid,
	 relforknumber int2, relblocknumber int8, isdirty bool, usagecount int2);

-- Don't want these to be available to public.
REVOKE ALL ON FUNCTION pg_buffercache_pages() FROM PUBLIC;
REVOKE ALL ON pg_buffercache FROM PUBLIC;