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# # Bug 23333990 PERSISTENT INDEX STATISTICS UPDATE BEFORE # TRANSACTION IS COMMITTED # "Test 1:- Uncommited delete test" CREATE TABLE t1 (id INT UNSIGNED NOT NULL AUTO_INCREMENT PRIMARY KEY, val INT UNSIGNED NOT NULL, INDEX (val)) ENGINE=INNODB STATS_PERSISTENT=1,STATS_AUTO_RECALC=1; INSERT INTO t1 (val) VALUES (4); INSERT INTO t1 (val) SELECT VAL from t1; INSERT INTO t1 (val) SELECT VAL from t1; INSERT INTO t1 (val) SELECT VAL from t1; INSERT INTO t1 (val) SELECT VAL from t1; INSERT INTO t1 (val) SELECT VAL from t1; INSERT INTO t1 (val) SELECT VAL from t1; INSERT INTO t1 (val) SELECT VAL from t1; INSERT INTO t1 (val) SELECT VAL from t1; INSERT INTO t1 (val) SELECT VAL from t1; INSERT INTO t1 (val) SELECT VAL from t1; INSERT INTO t1 (val) SELECT VAL from t1; INSERT INTO t1 (val) SELECT VAL from t1; INSERT INTO t1 (val) SELECT VAL from t1; INSERT INTO t1 (val) SELECT VAL from t1; INSERT INTO t1 (val) SELECT VAL from t1; INSERT INTO t1 (val) SELECT VAL from t1; INSERT INTO t1 (val) SELECT VAL from t1; INSERT INTO t1 (val) SELECT VAL from t1; SELECT COUNT(*) FROM t1; COUNT(*) 262144 Connection 1 START TRANSACTION; DELETE FROM t1; SELECT COUNT(*) FROM t1; Connection Default analyze table t1; Table Op Msg_type Msg_text test.t1 analyze status OK Test correctly estimates the number of rows as > 20000 even when in other uncommmited transaction all rows have been deleted. Connection 1 COUNT(*) 0 commit; Connection deafult Test 2:- Insert and rollback test CREATE TABLE t2 (id INT UNSIGNED NOT NULL AUTO_INCREMENT PRIMARY KEY, val INT UNSIGNED NOT NULL, INDEX (val)) ENGINE=INNODB STATS_PERSISTENT=1,STATS_AUTO_RECALC=1; Connection 1 START TRANSACTION; INSERT INTO t2 (val) VALUES (4); INSERT INTO t2 (val) SELECT VAL from t2; INSERT INTO t2 (val) SELECT VAL from t2; INSERT INTO t2 (val) SELECT VAL from t2; INSERT INTO t2 (val) SELECT VAL from t2; INSERT INTO t2 (val) SELECT VAL from t2; INSERT INTO t2 (val) SELECT VAL from t2; INSERT INTO t2 (val) SELECT VAL from t2; INSERT INTO t2 (val) SELECT VAL from t2; INSERT INTO t2 (val) SELECT VAL from t2; INSERT INTO t2 (val) SELECT VAL from t2; INSERT INTO t2 (val) SELECT VAL from t2; INSERT INTO t2 (val) SELECT VAL from t2; INSERT INTO t2 (val) SELECT VAL from t2; INSERT INTO t2 (val) SELECT VAL from t2; INSERT INTO t2 (val) SELECT VAL from t2; INSERT INTO t2 (val) SELECT VAL from t2; INSERT INTO t2 (val) SELECT VAL from t2; INSERT INTO t2 (val) SELECT VAL from t2; SELECT COUNT(*) FROM t2; Connection default select count(*) from t2; count(*) 0 analyze table t2; Table Op Msg_type Msg_text test.t2 analyze status OK Test correctly estimates the number of rows as > 20000 even when in other uncommited transaction many rows are inserted. Connection 1 COUNT(*) 262144 Rollback the insert rollback; Connection default Test correctly estimates the number of rows as 1 after rollback. DROP TABLE t1,t2;