77 lines
1.8 KiB
Plaintext
77 lines
1.8 KiB
Plaintext
#
|
|
# Bug #84958 InnoDB's MVCC has O(N^2) behaviors
|
|
# https://bugs.mysql.com/bug.php?id=84958
|
|
#
|
|
# Set up the test with a procedure and a function.
|
|
#
|
|
CREATE PROCEDURE insert_n(start int, end int)
|
|
BEGIN
|
|
DECLARE i INT DEFAULT start;
|
|
WHILE i <= end do
|
|
INSERT INTO t1 VALUES (1, 2, 3) ON DUPLICATE KEY UPDATE c = i;
|
|
SET i = i + 1;
|
|
END WHILE;
|
|
END~~
|
|
CREATE FUNCTION num_pages_get()
|
|
RETURNS INT
|
|
BEGIN
|
|
DECLARE ret INT;
|
|
SELECT number_pages_get FROM information_schema.innodb_buffer_pool_stats INTO ret;
|
|
RETURN ret;
|
|
END~~
|
|
SET GLOBAL innodb_purge_stop_now = ON;
|
|
SET GLOBAL innodb_dict_stats_disabled_debug = ON;
|
|
SET GLOBAL innodb_checkpoint_disabled = ON;
|
|
#
|
|
# Create a table with one record in it and start an RR transaction
|
|
#
|
|
CREATE TABLE t1 (a INT, b INT, c INT, PRIMARY KEY(a,b), KEY (b,c));
|
|
BEGIN;
|
|
SELECT * FROM t1;
|
|
a b c
|
|
#
|
|
# Create 100 newer record versions in con2 and con3
|
|
#
|
|
INSERT INTO t1 VALUES (1, 2, 3) ON DUPLICATE KEY UPDATE c = NULL;
|
|
CALL insert_n(1, 50);;
|
|
CALL insert_n(51, 100);;
|
|
INSERT INTO t1 VALUES (1, 2, 1) ON DUPLICATE KEY UPDATE c = NULL;
|
|
#
|
|
# Connect to default and record how many pages were accessed
|
|
# when selecting the record using the secondary key.
|
|
#
|
|
SET @num_pages_1 = num_pages_get();
|
|
SELECT * FROM t1 force index (b);
|
|
a b c
|
|
SET @num_pages_2= num_pages_get();
|
|
SELECT @num_pages_2 - @num_pages_1 < 510;
|
|
@num_pages_2 - @num_pages_1 < 510
|
|
1
|
|
#
|
|
# Commit and show the final record.
|
|
#
|
|
SELECT * FROM t1;
|
|
a b c
|
|
SELECT * FROM t1 force index (b);
|
|
a b c
|
|
COMMIT;
|
|
SELECT * FROM t1 force index (b);
|
|
a b c
|
|
1 2 NULL
|
|
SELECT * FROM t1;
|
|
a b c
|
|
1 2 NULL
|
|
CHECK TABLE t1;
|
|
Table Op Msg_type Msg_text
|
|
test.t1 check status OK
|
|
#
|
|
# Cleanup
|
|
#
|
|
DROP TABLE t1;
|
|
DROP PROCEDURE insert_n;
|
|
DROP FUNCTION num_pages_get;
|
|
SET GLOBAL innodb_purge_stop_now = default;
|
|
SET GLOBAL innodb_purge_run_now = ON;
|
|
SET GLOBAL innodb_dict_stats_disabled_debug = default;
|
|
SET GLOBAL innodb_checkpoint_disabled = default;
|