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DROP TABLE IF EXISTS t1,t2; CREATE TABLE t1 ( a INT NOT NULL, b INT NOT NULL) ; # The protocolling of many inserts into t1 is suppressed. ALTER TABLE t1 ADD INDEX i1(a); DELETE FROM t1 WHERE a > 2000000; CREATE TABLE t2 LIKE t1; INSERT INTO t2 SELECT * FROM t1; SELECT 't2 rows before small delete', COUNT(*) FROM t1; t2 rows before small delete COUNT(*) t2 rows before small delete 2000000 DELETE t1,t2 FROM t1,t2 WHERE t1.b=t2.a AND t1.a < 2; SELECT 't2 rows after small delete', COUNT(*) FROM t2; t2 rows after small delete COUNT(*) t2 rows after small delete 1999999 SELECT 't1 rows after small delete', COUNT(*) FROM t1; t1 rows after small delete COUNT(*) t1 rows after small delete 1999999 DELETE t1,t2 FROM t1,t2 WHERE t1.b=t2.a AND t1.a < 100*1000; SELECT 't2 rows after big delete', COUNT(*) FROM t2; t2 rows after big delete COUNT(*) t2 rows after big delete 1900001 SELECT 't1 rows after big delete', COUNT(*) FROM t1; t1 rows after big delete COUNT(*) t1 rows after big delete 1900001 DROP TABLE t1,t2;