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CREATE EXTENSION pg_buffercache;
select count(*) = (select setting::bigint
from pg_settings
where name = 'shared_buffers')
from pg_buffercache;
?column?
----------
t
(1 row)
select buffers_used + buffers_unused > 0,
buffers_dirty <= buffers_used,
buffers_pinned <= buffers_used
from pg_buffercache_summary();
?column? | ?column? | ?column?
----------+----------+----------
t | t | t
(1 row)
SELECT count(*) > 0 FROM pg_buffercache_usage_counts() WHERE buffers >= 0;
?column?
----------
t
(1 row)
-- 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;
ERROR: permission denied for view pg_buffercache
SELECT * FROM pg_buffercache_pages() AS p (wrong int);
ERROR: permission denied for function pg_buffercache_pages
SELECT * FROM pg_buffercache_summary();
ERROR: permission denied for function pg_buffercache_summary
SELECT * FROM pg_buffercache_usage_counts();
ERROR: permission denied for function 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;
?column?
----------
t
(1 row)
SELECT buffers_used + buffers_unused > 0 FROM pg_buffercache_summary();
?column?
----------
t
(1 row)
SELECT count(*) > 0 FROM pg_buffercache_usage_counts();
?column?
----------
t
(1 row)
RESET role;
------
---- Test pg_buffercache_evict* functions
------
CREATE ROLE regress_buffercache_normal;
SET ROLE regress_buffercache_normal;
-- These should fail because they need to be called as SUPERUSER
SELECT * FROM pg_buffercache_evict(1);
ERROR: must be superuser to use pg_buffercache_evict()
SELECT * FROM pg_buffercache_evict_relation(1);
ERROR: must be superuser to use pg_buffercache_evict_relation()
SELECT * FROM pg_buffercache_evict_all();
ERROR: must be superuser to use pg_buffercache_evict_all()
RESET ROLE;
-- These should return nothing, because these are STRICT functions
SELECT * FROM pg_buffercache_evict(NULL);
buffer_evicted | buffer_flushed
----------------+----------------
|
(1 row)
SELECT * FROM pg_buffercache_evict_relation(NULL);
buffers_evicted | buffers_flushed | buffers_skipped
-----------------+-----------------+-----------------
| |
(1 row)
-- These should fail because they are not called by valid range of buffers
-- Number of the shared buffers are limited by max integer
SELECT 2147483647 max_buffers \gset
SELECT * FROM pg_buffercache_evict(-1);
ERROR: bad buffer ID: -1
SELECT * FROM pg_buffercache_evict(0);
ERROR: bad buffer ID: 0
SELECT * FROM pg_buffercache_evict(:max_buffers);
ERROR: bad buffer ID: 2147483647
-- This should fail because pg_buffercache_evict_relation() doesn't accept
-- local relations
CREATE TEMP TABLE temp_pg_buffercache();
SELECT * FROM pg_buffercache_evict_relation('temp_pg_buffercache');
ERROR: relation uses local buffers, pg_buffercache_evict_relation() is intended to be used for shared buffers only
DROP TABLE temp_pg_buffercache;
-- These shouldn't fail
SELECT buffer_evicted IS NOT NULL FROM pg_buffercache_evict(1);
?column?
----------
t
(1 row)
SELECT buffers_evicted IS NOT NULL FROM pg_buffercache_evict_all();
?column?
----------
t
(1 row)
CREATE TABLE shared_pg_buffercache();
SELECT buffers_evicted IS NOT NULL FROM pg_buffercache_evict_relation('shared_pg_buffercache');
?column?
----------
t
(1 row)
DROP TABLE shared_pg_buffercache;
DROP ROLE regress_buffercache_normal;
|
