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SET SESSION TRANSACTION ISOLATION LEVEL READ COMMITTED; SET SESSION TRANSACTION ISOLATION LEVEL READ COMMITTED; CREATE TABLE t1(c1 VARCHAR(10) NOT NULL, c2 VARCHAR(10) NOT NULL, c3 VARCHAR(10) NOT NULL); INSERT INTO t1(c1, c2, c3) VALUES('A1','B1','IT1'), ('A2','B2','IT1'), ('A3','B3','IT1'), ('A4','B4','IT1'), ('A5','B5','IT1'), ('A6','B6','IT1'), ('A7','B7','IT1'); CREATE TABLE t2(c1 VARCHAR(10) NOT NULL, c2 VARCHAR(10) NOT NULL, c3 VARCHAR(10) NOT NULL); INSERT INTO t2(c1, c2, c3) VALUES ('A3','B3','IT2'), ('A2','B2','IT2'), ('A4','B4','IT2'), ('A5','B5','II2'); CREATE TABLE result(id BIGINT UNSIGNED NOT NULL AUTO_INCREMENT, c1 VARCHAR(10) NOT NULL, c2 VARCHAR(10), c3 VARCHAR(10), update_count INT DEFAULT 0, UNIQUE KEY uniq_idx (c1,c2), PRIMARY KEY (id)) ENGINE = innodb; SET DEBUG_SYNC = "ha_write_row_end WAIT_FOR flushed EXECUTE 1"; INSERT INTO result(c1, c2, c3) SELECT * FROM t1 ON DUPLICATE KEY UPDATE c2=t1.c2, c3='UT1', update_count=update_count+1; INSERT INTO result(c1, c2, c3) SELECT * FROM t2 ON DUPLICATE KEY UPDATE c2=t2.c2, c3='UT2', update_count=update_count+1; SET DEBUG_SYNC = "now SIGNAL flushed"; SELECT * FROM result; id c1 c2 c3 update_count 1 A1 B1 IT1 0 2 A3 B3 UT1 1 3 A2 B2 UT1 1 4 A4 B4 UT1 1 5 A5 B5 UT1 1 9 A6 B6 IT1 0 10 A7 B7 IT1 0 DROP TABLE t1; DROP TABLE t2; DROP TABLE result;