You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
109 lines
2.4 KiB
109 lines
2.4 KiB
#
|
|
# Test temptable_use_mmap
|
|
#
|
|
|
|
# Restart the server to clean up any prior allocations
|
|
let $restart_parameters=;
|
|
--source include/restart_mysqld.inc
|
|
|
|
SELECT @@global.temptable_use_mmap;
|
|
|
|
--error ER_GLOBAL_VARIABLE
|
|
SET @@session.temptable_use_mmap=false;
|
|
|
|
--error ER_WRONG_VALUE_FOR_VAR
|
|
SET @@global.temptable_use_mmap=NULL;
|
|
|
|
--echo # Test with temptable_use_mmap set to false
|
|
--echo # to stop overflowing temptable to disk
|
|
|
|
SET @@global.temptable_use_mmap=false;
|
|
|
|
SELECT @@global.temptable_use_mmap;
|
|
|
|
# Ensure there are no existing allocations
|
|
SELECT count_alloc > 0
|
|
FROM performance_schema.memory_summary_global_by_event_name
|
|
WHERE event_name = 'memory/temptable/physical_disk';
|
|
|
|
CREATE TABLE t (c VARCHAR(128));
|
|
|
|
INSERT INTO t VALUES
|
|
(REPEAT('a', 128)),
|
|
(REPEAT('b', 128)),
|
|
(REPEAT('c', 128)),
|
|
(REPEAT('d', 128));
|
|
|
|
ANALYZE TABLE t;
|
|
|
|
SET GLOBAL temptable_max_ram = 2097152;
|
|
|
|
-- disable_result_log
|
|
SELECT * FROM
|
|
t AS t1,
|
|
t AS t2,
|
|
t AS t3,
|
|
t AS t4,
|
|
t AS t5,
|
|
t AS t6
|
|
ORDER BY 1
|
|
LIMIT 2;
|
|
-- enable_result_log
|
|
|
|
SET GLOBAL temptable_max_ram = default;
|
|
|
|
# There should be no allocations on the physical disk
|
|
SELECT count_alloc > 0
|
|
FROM performance_schema.memory_summary_global_by_event_name
|
|
WHERE event_name = 'memory/temptable/physical_disk';
|
|
|
|
DROP TABLE t;
|
|
|
|
--echo # Test with temptable_use_mmap set to true
|
|
--echo # to enable overflowing temptable to disk
|
|
|
|
SET @@global.temptable_use_mmap = true;
|
|
SELECT @@global.temptable_use_mmap;
|
|
|
|
#
|
|
# Test TempTable overflow to disk
|
|
#
|
|
|
|
CREATE TABLE t (c VARCHAR(128));
|
|
|
|
INSERT INTO t VALUES
|
|
(REPEAT('a', 128)),
|
|
(REPEAT('b', 128)),
|
|
(REPEAT('c', 128)),
|
|
(REPEAT('d', 128));
|
|
|
|
ANALYZE TABLE t;
|
|
|
|
SET GLOBAL temptable_max_ram = 2097152;
|
|
-- disable_result_log
|
|
--echo # Disable hash join, since that will trigger the new execution engine,
|
|
--echo # which in turn won't do the temporary materialization needed to trigger
|
|
--echo # overflow to disk.
|
|
SELECT /*+ NO_HASH_JOIN(t1, t2, t3, t4, t5, t6) */ * FROM
|
|
t AS t1,
|
|
t AS t2,
|
|
t AS t3,
|
|
t AS t4,
|
|
t AS t5,
|
|
t AS t6
|
|
ORDER BY 1
|
|
LIMIT 2;
|
|
-- enable_result_log
|
|
|
|
SET GLOBAL temptable_max_ram = default;
|
|
SET GLOBAL temptable_use_mmap = default;
|
|
|
|
SELECT @@global.temptable_use_mmap;
|
|
|
|
# Just make sure some disk pages were allocated, the exact number of bytes
|
|
# and pages is irrelevant for this test.
|
|
SELECT count_alloc > 0
|
|
FROM performance_schema.memory_summary_global_by_event_name
|
|
WHERE event_name = 'memory/temptable/physical_disk';
|
|
|
|
DROP TABLE t;
|
|
|