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CREATE EXTENSION pg_buffercache;
select count(*) = (select setting::bigint
from pg_settings
where name = 'shared_buffers')
from pg_buffercache;
select buffers_used + buffers_unused > 0,
buffers_dirty <= buffers_used,
buffers_pinned <= buffers_used
from pg_buffercache_summary();
SELECT count(*) > 0 FROM pg_buffercache_usage_counts() WHERE buffers >= 0;
-- Check that the functions / views can't be accessed by default. To avoid
-- having to create a dedicated user, use the pg_database_owner pseudo-role.
SET ROLE pg_database_owner;
SELECT * FROM pg_buffercache;
SELECT * FROM pg_buffercache_pages() AS p (wrong int);
SELECT * FROM pg_buffercache_summary();
SELECT * FROM pg_buffercache_usage_counts();
RESET role;
-- Check that pg_monitor is allowed to query view / function
SET ROLE pg_monitor;
SELECT count(*) > 0 FROM pg_buffercache;
SELECT buffers_used + buffers_unused > 0 FROM pg_buffercache_summary();
SELECT count(*) > 0 FROM pg_buffercache_usage_counts();
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