97 lines
2.3 KiB
Plaintext
97 lines
2.3 KiB
Plaintext
--disable_ps_protocol
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--echo #
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--echo # Bug #84958 InnoDB's MVCC has O(N^2) behaviors
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--echo # https://bugs.mysql.com/bug.php?id=84958
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--echo #
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--echo # Set up the test with a procedure and a function.
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--echo #
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--source include/have_debug.inc
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DELIMITER ~~;
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CREATE PROCEDURE insert_n(start int, end int)
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BEGIN
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DECLARE i INT DEFAULT start;
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WHILE i <= end do
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INSERT INTO t1 VALUES (1, 2, 3) ON DUPLICATE KEY UPDATE c = i;
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SET i = i + 1;
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END WHILE;
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END~~
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CREATE FUNCTION num_pages_get()
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RETURNS INT
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BEGIN
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DECLARE ret INT;
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SELECT number_pages_get FROM information_schema.innodb_buffer_pool_stats INTO ret;
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RETURN ret;
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END~~
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DELIMITER ;~~
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# Stop threads from interfering in the test
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SET GLOBAL innodb_purge_stop_now = ON;
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SET GLOBAL innodb_dict_stats_disabled_debug = ON;
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SET GLOBAL innodb_checkpoint_disabled = ON;
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--echo #
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--echo # Create a table with one record in it and start an RR transaction
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--echo #
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CREATE TABLE t1 (a INT, b INT, c INT, PRIMARY KEY(a,b), KEY (b,c));
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BEGIN;
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SELECT * FROM t1;
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--echo #
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--echo # Create 100 newer record versions in con2 and con3
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--echo #
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connect (con2, localhost, root,,);
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connection con2;
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INSERT INTO t1 VALUES (1, 2, 3) ON DUPLICATE KEY UPDATE c = NULL;
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--send CALL insert_n(1, 50);
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connect (con3, localhost, root,,);
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connection con3;
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--send CALL insert_n(51, 100);
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connection con2;
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reap;
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connection con3;
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reap;
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INSERT INTO t1 VALUES (1, 2, 1) ON DUPLICATE KEY UPDATE c = NULL;
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connection default;
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--echo #
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--echo # Connect to default and record how many pages were accessed
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--echo # when selecting the record using the secondary key.
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--echo #
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SET @num_pages_1 = num_pages_get();
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SELECT * FROM t1 force index (b);
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SET @num_pages_2= num_pages_get();
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SELECT @num_pages_2 - @num_pages_1 < 510;
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--echo #
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--echo # Commit and show the final record.
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--echo #
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SELECT * FROM t1;
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SELECT * FROM t1 force index (b);
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COMMIT;
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SELECT * FROM t1 force index (b);
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SELECT * FROM t1;
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CHECK TABLE t1;
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--echo #
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--echo # Cleanup
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--echo #
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disconnect con2;
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disconnect con3;
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DROP TABLE t1;
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DROP PROCEDURE insert_n;
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DROP FUNCTION num_pages_get;
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# Restore values
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SET GLOBAL innodb_purge_stop_now = default;
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# Force the purge thread to run
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SET GLOBAL innodb_purge_run_now = ON;
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SET GLOBAL innodb_dict_stats_disabled_debug = default;
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SET GLOBAL innodb_checkpoint_disabled = default;
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