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#
# WL#6742 - Test the interaction of multiple transactions using
# different isolation levels to make sure that the value returned
# by count(*) always reflects the correct view of the table according
# to the transaction's selected isolation level.
#
#
# Traverse various indexes to get the right counts.
# This especially tests count(*) which is pushed down to InnoDB in WL#6742.
#
CREATE TABLE t1 (
c1 INT AUTO_INCREMENT PRIMARY KEY,
c2 INT,
c3 INT,
c4 INT,
INDEX k2(c2)
) Engine=InnoDB;
INSERT INTO t1(c2,c3,c4) VALUES (1, 1, 1);
INSERT INTO t1(c2,c3,c4) VALUES (1, 1, 1);
INSERT INTO t1(c2,c3,c4) VALUES (1, 1, 1);
INSERT INTO t1(c2,c3,c4) VALUES (1, 1, 1);
INSERT INTO t1(c2,c3,c4) VALUES (1, 1, 1);
INSERT INTO t1(c2,c3,c4) VALUES (1, 1, 1);
INSERT INTO t1(c2,c3,c4) VALUES (1, 1, 1);
INSERT INTO t1(c2,c3,c4) VALUES (1, 1, 1);
INSERT INTO t1(c2,c3,c4) VALUES (1, 1, 1);
INSERT INTO t1(c2,c3,c4) VALUES (1, 1, 1);
CREATE TABLE t2 LIKE t1;
INSERT INTO t2 (SELECT * FROM t1);
affected rows: 10
info: Records: 10 Duplicates: 0 Warnings: 0
CREATE TABLE t3 (
c1 INT AUTO_INCREMENT PRIMARY KEY,
c2 INT,
c3 INT,
c4 INT,
INDEX k2(c2)
) Engine=InnoDB PARTITION BY HASH(c1) PARTITIONS 4;
INSERT INTO t3 (SELECT * FROM t1);
affected rows: 10
info: Records: 10 Duplicates: 0 Warnings: 0
########## innodb_isolation_selects.inc ##########
SELECT * FROM t1;
c1 c2 c3 c4
1 1 1 1
2 1 1 1
3 1 1 1
4 1 1 1
5 1 1 1
6 1 1 1
7 1 1 1
8 1 1 1
9 1 1 1
10 1 1 1
SELECT COUNT(*) FROM t1;
COUNT(*)
10
SELECT COUNT(*) FROM t3;
COUNT(*)
10
SELECT COUNT(c1) FROM t1;
COUNT(c1)
10
SELECT COUNT(c2) FROM t1;
COUNT(c2)
10
SELECT COUNT(c3) FROM t1;
COUNT(c3)
10
SELECT SUM(c1) FROM t1;
SUM(c1)
55
SELECT SUM(c2) FROM t1;
SUM(c2)
10
SELECT AVG(c1), MAX(c1), MIN(c2), AVG(c3), SUM(c4) FROM t1;
AVG(c1) MAX(c1) MIN(c2) AVG(c3) SUM(c4)
5.5000 10 1 1.0000 10
SELECT AVG(c1), MAX(c1), MIN(c2), AVG(c3), SUM(c4) FROM t3;
AVG(c1) MAX(c1) MIN(c2) AVG(c3) SUM(c4)
5.5000 10 1 1.0000 10
SELECT c1, c2 FROM t1 WHERE c1 > ((SELECT COUNT(*) FROM t1) / 2);
c1 c2
6 1
7 1
8 1
9 1
10 1
SELECT c1, c2 FROM t1 WHERE c1 > ((SELECT COUNT(*) FROM t3) / 2);
c1 c2
6 1
7 1
8 1
9 1
10 1
SELECT COUNT(c2) FROM t1 WHERE c1 > ((SELECT COUNT(*) FROM t1) / 2);
COUNT(c2)
5
SELECT COUNT(c2) FROM t1 WHERE c1 > ((SELECT COUNT(*) FROM t3) / 2);
COUNT(c2)
5
SELECT COUNT(*) FROM t1 WHERE c1 > (SELECT AVG(c1) FROM t1);
COUNT(*)
5
SELECT COUNT(*) FROM t1 WHERE c1 > (SELECT AVG(c1) FROM t3);
COUNT(*)
5
###############################################
#
# Do some DML in the default connection and leave the transaction pending.
#
SET SESSION TRANSACTION ISOLATION LEVEL REPEATABLE READ;
BEGIN;
UPDATE t1 SET c2 = c2 * 3 WHERE c1 = 1;
affected rows: 1
info: Rows matched: 1 Changed: 1 Warnings: 0
UPDATE t3 SET c2 = c2 * 3 WHERE c1 = 1;
affected rows: 1
info: Rows matched: 1 Changed: 1 Warnings: 0
DELETE FROM t1 WHERE c1 = 6;
affected rows: 1
DELETE FROM t3 WHERE c1 = 6;
affected rows: 1
########## innodb_isolation_selects.inc ##########
SELECT * FROM t1;
c1 c2 c3 c4
1 3 1 1
2 1 1 1
3 1 1 1
4 1 1 1
5 1 1 1
7 1 1 1
8 1 1 1
9 1 1 1
10 1 1 1
SELECT COUNT(*) FROM t1;
COUNT(*)
9
SELECT COUNT(*) FROM t3;
COUNT(*)
9
SELECT COUNT(c1) FROM t1;
COUNT(c1)
9
SELECT COUNT(c2) FROM t1;
COUNT(c2)
9
SELECT COUNT(c3) FROM t1;
COUNT(c3)
9
SELECT SUM(c1) FROM t1;
SUM(c1)
49
SELECT SUM(c2) FROM t1;
SUM(c2)
11
SELECT AVG(c1), MAX(c1), MIN(c2), AVG(c3), SUM(c4) FROM t1;
AVG(c1) MAX(c1) MIN(c2) AVG(c3) SUM(c4)
5.4444 10 1 1.0000 9
SELECT AVG(c1), MAX(c1), MIN(c2), AVG(c3), SUM(c4) FROM t3;
AVG(c1) MAX(c1) MIN(c2) AVG(c3) SUM(c4)
5.4444 10 1 1.0000 9
SELECT c1, c2 FROM t1 WHERE c1 > ((SELECT COUNT(*) FROM t1) / 2);
c1 c2
5 1
7 1
8 1
9 1
10 1
SELECT c1, c2 FROM t1 WHERE c1 > ((SELECT COUNT(*) FROM t3) / 2);
c1 c2
5 1
7 1
8 1
9 1
10 1
SELECT COUNT(c2) FROM t1 WHERE c1 > ((SELECT COUNT(*) FROM t1) / 2);
COUNT(c2)
5
SELECT COUNT(c2) FROM t1 WHERE c1 > ((SELECT COUNT(*) FROM t3) / 2);
COUNT(c2)
5
SELECT COUNT(*) FROM t1 WHERE c1 > (SELECT AVG(c1) FROM t1);
COUNT(*)
4
SELECT COUNT(*) FROM t1 WHERE c1 > (SELECT AVG(c1) FROM t3);
COUNT(*)
4
###############################################
#
# Start transactions of Repeatable Read, Read Committed, and Read Uncommitted
#
# Connection 1 REPEATABLE READ
#
SET SESSION TRANSACTION ISOLATION LEVEL REPEATABLE READ;
BEGIN;
########## innodb_isolation_selects.inc ##########
SELECT * FROM t1;
c1 c2 c3 c4
1 1 1 1
2 1 1 1
3 1 1 1
4 1 1 1
5 1 1 1
6 1 1 1
7 1 1 1
8 1 1 1
9 1 1 1
10 1 1 1
SELECT COUNT(*) FROM t1;
COUNT(*)
10
SELECT COUNT(*) FROM t3;
COUNT(*)
10
SELECT COUNT(c1) FROM t1;
COUNT(c1)
10
SELECT COUNT(c2) FROM t1;
COUNT(c2)
10
SELECT COUNT(c3) FROM t1;
COUNT(c3)
10
SELECT SUM(c1) FROM t1;
SUM(c1)
55
SELECT SUM(c2) FROM t1;
SUM(c2)
10
SELECT AVG(c1), MAX(c1), MIN(c2), AVG(c3), SUM(c4) FROM t1;
AVG(c1) MAX(c1) MIN(c2) AVG(c3) SUM(c4)
5.5000 10 1 1.0000 10
SELECT AVG(c1), MAX(c1), MIN(c2), AVG(c3), SUM(c4) FROM t3;
AVG(c1) MAX(c1) MIN(c2) AVG(c3) SUM(c4)
5.5000 10 1 1.0000 10
SELECT c1, c2 FROM t1 WHERE c1 > ((SELECT COUNT(*) FROM t1) / 2);
c1 c2
6 1
7 1
8 1
9 1
10 1
SELECT c1, c2 FROM t1 WHERE c1 > ((SELECT COUNT(*) FROM t3) / 2);
c1 c2
6 1
7 1
8 1
9 1
10 1
SELECT COUNT(c2) FROM t1 WHERE c1 > ((SELECT COUNT(*) FROM t1) / 2);
COUNT(c2)
5
SELECT COUNT(c2) FROM t1 WHERE c1 > ((SELECT COUNT(*) FROM t3) / 2);
COUNT(c2)
5
SELECT COUNT(*) FROM t1 WHERE c1 > (SELECT AVG(c1) FROM t1);
COUNT(*)
5
SELECT COUNT(*) FROM t1 WHERE c1 > (SELECT AVG(c1) FROM t3);
COUNT(*)
5
###############################################
UPDATE t1 SET c2 = c2 * 5 WHERE c1 = 2;
affected rows: 1
info: Rows matched: 1 Changed: 1 Warnings: 0
UPDATE t3 SET c2 = c2 * 5 WHERE c1 = 2;
affected rows: 1
info: Rows matched: 1 Changed: 1 Warnings: 0
DELETE FROM t1 WHERE c1 = 7;
affected rows: 1
DELETE FROM t3 WHERE c1 = 7;
affected rows: 1
INSERT INTO t1(c2,c3,c4) VALUES (100, 1, 1);
affected rows: 1
INSERT INTO t3(c2,c3,c4) VALUES (100, 1, 1);
affected rows: 1
########## innodb_isolation_selects.inc ##########
SELECT * FROM t1;
c1 c2 c3 c4
1 1 1 1
2 5 1 1
3 1 1 1
4 1 1 1
5 1 1 1
6 1 1 1
8 1 1 1
9 1 1 1
10 1 1 1
11 100 1 1
SELECT COUNT(*) FROM t1;
COUNT(*)
10
SELECT COUNT(*) FROM t3;
COUNT(*)
10
SELECT COUNT(c1) FROM t1;
COUNT(c1)
10
SELECT COUNT(c2) FROM t1;
COUNT(c2)
10
SELECT COUNT(c3) FROM t1;
COUNT(c3)
10
SELECT SUM(c1) FROM t1;
SUM(c1)
59
SELECT SUM(c2) FROM t1;
SUM(c2)
113
SELECT AVG(c1), MAX(c1), MIN(c2), AVG(c3), SUM(c4) FROM t1;
AVG(c1) MAX(c1) MIN(c2) AVG(c3) SUM(c4)
5.9000 11 1 1.0000 10
SELECT AVG(c1), MAX(c1), MIN(c2), AVG(c3), SUM(c4) FROM t3;
AVG(c1) MAX(c1) MIN(c2) AVG(c3) SUM(c4)
5.9000 11 1 1.0000 10
SELECT c1, c2 FROM t1 WHERE c1 > ((SELECT COUNT(*) FROM t1) / 2);
c1 c2
6 1
8 1
9 1
10 1
11 100
SELECT c1, c2 FROM t1 WHERE c1 > ((SELECT COUNT(*) FROM t3) / 2);
c1 c2
6 1
8 1
9 1
10 1
11 100
SELECT COUNT(c2) FROM t1 WHERE c1 > ((SELECT COUNT(*) FROM t1) / 2);
COUNT(c2)
5
SELECT COUNT(c2) FROM t1 WHERE c1 > ((SELECT COUNT(*) FROM t3) / 2);
COUNT(c2)
5
SELECT COUNT(*) FROM t1 WHERE c1 > (SELECT AVG(c1) FROM t1);
COUNT(*)
5
SELECT COUNT(*) FROM t1 WHERE c1 > (SELECT AVG(c1) FROM t3);
COUNT(*)
5
###############################################
#
# Test a lock wait timeout during COUNT(*)
#
SET innodb_lock_wait_timeout = 1;
SELECT COUNT(*) FROM t1 FOR UPDATE;
ERROR HY000: Lock wait timeout exceeded; try restarting transaction
#
# Connection 2 READ COMMITTED
#
SET SESSION TRANSACTION ISOLATION LEVEL READ COMMITTED;
BEGIN;
########## innodb_isolation_selects.inc ##########
SELECT * FROM t1;
c1 c2 c3 c4
1 1 1 1
2 1 1 1
3 1 1 1
4 1 1 1
5 1 1 1
6 1 1 1
7 1 1 1
8 1 1 1
9 1 1 1
10 1 1 1
SELECT COUNT(*) FROM t1;
COUNT(*)
10
SELECT COUNT(*) FROM t3;
COUNT(*)
10
SELECT COUNT(c1) FROM t1;
COUNT(c1)
10
SELECT COUNT(c2) FROM t1;
COUNT(c2)
10
SELECT COUNT(c3) FROM t1;
COUNT(c3)
10
SELECT SUM(c1) FROM t1;
SUM(c1)
55
SELECT SUM(c2) FROM t1;
SUM(c2)
10
SELECT AVG(c1), MAX(c1), MIN(c2), AVG(c3), SUM(c4) FROM t1;
AVG(c1) MAX(c1) MIN(c2) AVG(c3) SUM(c4)
5.5000 10 1 1.0000 10
SELECT AVG(c1), MAX(c1), MIN(c2), AVG(c3), SUM(c4) FROM t3;
AVG(c1) MAX(c1) MIN(c2) AVG(c3) SUM(c4)
5.5000 10 1 1.0000 10
SELECT c1, c2 FROM t1 WHERE c1 > ((SELECT COUNT(*) FROM t1) / 2);
c1 c2
6 1
7 1
8 1
9 1
10 1
SELECT c1, c2 FROM t1 WHERE c1 > ((SELECT COUNT(*) FROM t3) / 2);
c1 c2
6 1
7 1
8 1
9 1
10 1
SELECT COUNT(c2) FROM t1 WHERE c1 > ((SELECT COUNT(*) FROM t1) / 2);
COUNT(c2)
5
SELECT COUNT(c2) FROM t1 WHERE c1 > ((SELECT COUNT(*) FROM t3) / 2);
COUNT(c2)
5
SELECT COUNT(*) FROM t1 WHERE c1 > (SELECT AVG(c1) FROM t1);
COUNT(*)
5
SELECT COUNT(*) FROM t1 WHERE c1 > (SELECT AVG(c1) FROM t3);
COUNT(*)
5
###############################################
UPDATE t1 SET c2 = c2 * 7 WHERE c1 = 3;
affected rows: 1
info: Rows matched: 1 Changed: 1 Warnings: 0
DELETE FROM t1 WHERE c1 = 8;
affected rows: 1
DELETE FROM t3 WHERE c1 = 8;
affected rows: 1
INSERT INTO t1(c2,c3,c4) VALUES (1000, 1, 1);
affected rows: 1
INSERT INTO t3(c2,c3,c4) VALUES (1000, 1, 1);
affected rows: 1
########## innodb_isolation_selects.inc ##########
SELECT * FROM t1;
c1 c2 c3 c4
1 1 1 1
2 1 1 1
3 7 1 1
4 1 1 1
5 1 1 1
6 1 1 1
7 1 1 1
9 1 1 1
10 1 1 1
12 1000 1 1
SELECT COUNT(*) FROM t1;
COUNT(*)
10
SELECT COUNT(*) FROM t3;
COUNT(*)
10
SELECT COUNT(c1) FROM t1;
COUNT(c1)
10
SELECT COUNT(c2) FROM t1;
COUNT(c2)
10
SELECT COUNT(c3) FROM t1;
COUNT(c3)
10
SELECT SUM(c1) FROM t1;
SUM(c1)
59
SELECT SUM(c2) FROM t1;
SUM(c2)
1015
SELECT AVG(c1), MAX(c1), MIN(c2), AVG(c3), SUM(c4) FROM t1;
AVG(c1) MAX(c1) MIN(c2) AVG(c3) SUM(c4)
5.9000 12 1 1.0000 10
SELECT AVG(c1), MAX(c1), MIN(c2), AVG(c3), SUM(c4) FROM t3;
AVG(c1) MAX(c1) MIN(c2) AVG(c3) SUM(c4)
5.9000 12 1 1.0000 10
SELECT c1, c2 FROM t1 WHERE c1 > ((SELECT COUNT(*) FROM t1) / 2);
c1 c2
6 1
7 1
9 1
10 1
12 1000
SELECT c1, c2 FROM t1 WHERE c1 > ((SELECT COUNT(*) FROM t3) / 2);
c1 c2
6 1
7 1
9 1
10 1
12 1000
SELECT COUNT(c2) FROM t1 WHERE c1 > ((SELECT COUNT(*) FROM t1) / 2);
COUNT(c2)
5
SELECT COUNT(c2) FROM t1 WHERE c1 > ((SELECT COUNT(*) FROM t3) / 2);
COUNT(c2)
5
SELECT COUNT(*) FROM t1 WHERE c1 > (SELECT AVG(c1) FROM t1);
COUNT(*)
5
SELECT COUNT(*) FROM t1 WHERE c1 > (SELECT AVG(c1) FROM t3);
COUNT(*)
5
###############################################
#
# Connection 3 READ UNCOMMITTED
#
SET SESSION TRANSACTION ISOLATION LEVEL READ UNCOMMITTED;
BEGIN;
########## innodb_isolation_selects.inc ##########
SELECT * FROM t1;
c1 c2 c3 c4
1 3 1 1
2 5 1 1
3 7 1 1
4 1 1 1
5 1 1 1
9 1 1 1
10 1 1 1
11 100 1 1
12 1000 1 1
SELECT COUNT(*) FROM t1;
COUNT(*)
9
SELECT COUNT(*) FROM t3;
COUNT(*)
9
SELECT COUNT(c1) FROM t1;
COUNT(c1)
9
SELECT COUNT(c2) FROM t1;
COUNT(c2)
9
SELECT COUNT(c3) FROM t1;
COUNT(c3)
9
SELECT SUM(c1) FROM t1;
SUM(c1)
57
SELECT SUM(c2) FROM t1;
SUM(c2)
1119
SELECT AVG(c1), MAX(c1), MIN(c2), AVG(c3), SUM(c4) FROM t1;
AVG(c1) MAX(c1) MIN(c2) AVG(c3) SUM(c4)
6.3333 12 1 1.0000 9
SELECT AVG(c1), MAX(c1), MIN(c2), AVG(c3), SUM(c4) FROM t3;
AVG(c1) MAX(c1) MIN(c2) AVG(c3) SUM(c4)
6.3333 12 1 1.0000 9
SELECT c1, c2 FROM t1 WHERE c1 > ((SELECT COUNT(*) FROM t1) / 2);
c1 c2
5 1
9 1
10 1
11 100
12 1000
SELECT c1, c2 FROM t1 WHERE c1 > ((SELECT COUNT(*) FROM t3) / 2);
c1 c2
5 1
9 1
10 1
11 100
12 1000
SELECT COUNT(c2) FROM t1 WHERE c1 > ((SELECT COUNT(*) FROM t1) / 2);
COUNT(c2)
5
SELECT COUNT(c2) FROM t1 WHERE c1 > ((SELECT COUNT(*) FROM t3) / 2);
COUNT(c2)
5
SELECT COUNT(*) FROM t1 WHERE c1 > (SELECT AVG(c1) FROM t1);
COUNT(*)
4
SELECT COUNT(*) FROM t1 WHERE c1 > (SELECT AVG(c1) FROM t3);
COUNT(*)
4
###############################################
UPDATE t1 SET c2 = c2 * 11 WHERE c1 = 4;
affected rows: 1
info: Rows matched: 1 Changed: 1 Warnings: 0
UPDATE t3 SET c2 = c2 * 11 WHERE c1 = 4;
affected rows: 1
info: Rows matched: 1 Changed: 1 Warnings: 0
INSERT INTO t1(c2,c3,c4) VALUES (10000, 1, 1);
affected rows: 1
INSERT INTO t3(c2,c3,c4) VALUES (10000, 1, 1);
affected rows: 1
DELETE FROM t1 WHERE c1 in(9);
affected rows: 1
DELETE FROM t3 WHERE c1 in(9);
affected rows: 1
########## innodb_isolation_selects.inc ##########
SELECT * FROM t1;
c1 c2 c3 c4
1 3 1 1
2 5 1 1
3 7 1 1
4 11 1 1
5 1 1 1
10 1 1 1
11 100 1 1
12 1000 1 1
13 10000 1 1
SELECT COUNT(*) FROM t1;
COUNT(*)
9
SELECT COUNT(*) FROM t3;
COUNT(*)
9
SELECT COUNT(c1) FROM t1;
COUNT(c1)
9
SELECT COUNT(c2) FROM t1;
COUNT(c2)
9
SELECT COUNT(c3) FROM t1;
COUNT(c3)
9
SELECT SUM(c1) FROM t1;
SUM(c1)
61
SELECT SUM(c2) FROM t1;
SUM(c2)
11128
SELECT AVG(c1), MAX(c1), MIN(c2), AVG(c3), SUM(c4) FROM t1;
AVG(c1) MAX(c1) MIN(c2) AVG(c3) SUM(c4)
6.7778 13 1 1.0000 9
SELECT AVG(c1), MAX(c1), MIN(c2), AVG(c3), SUM(c4) FROM t3;
AVG(c1) MAX(c1) MIN(c2) AVG(c3) SUM(c4)
6.7778 13 1 1.0000 9
SELECT c1, c2 FROM t1 WHERE c1 > ((SELECT COUNT(*) FROM t1) / 2);
c1 c2
5 1
10 1
11 100
12 1000
13 10000
SELECT c1, c2 FROM t1 WHERE c1 > ((SELECT COUNT(*) FROM t3) / 2);
c1 c2
5 1
10 1
11 100
12 1000
13 10000
SELECT COUNT(c2) FROM t1 WHERE c1 > ((SELECT COUNT(*) FROM t1) / 2);
COUNT(c2)
5
SELECT COUNT(c2) FROM t1 WHERE c1 > ((SELECT COUNT(*) FROM t3) / 2);
COUNT(c2)
5
SELECT COUNT(*) FROM t1 WHERE c1 > (SELECT AVG(c1) FROM t1);
COUNT(*)
4
SELECT COUNT(*) FROM t1 WHERE c1 > (SELECT AVG(c1) FROM t3);
COUNT(*)
4
###############################################
#
# Connection default REPEATABLE READ
#
########## innodb_isolation_selects.inc ##########
SELECT * FROM t1;
c1 c2 c3 c4
1 3 1 1
2 1 1 1
3 1 1 1
4 1 1 1
5 1 1 1
7 1 1 1
8 1 1 1
9 1 1 1
10 1 1 1
SELECT COUNT(*) FROM t1;
COUNT(*)
9
SELECT COUNT(*) FROM t3;
COUNT(*)
9
SELECT COUNT(c1) FROM t1;
COUNT(c1)
9
SELECT COUNT(c2) FROM t1;
COUNT(c2)
9
SELECT COUNT(c3) FROM t1;
COUNT(c3)
9
SELECT SUM(c1) FROM t1;
SUM(c1)
49
SELECT SUM(c2) FROM t1;
SUM(c2)
11
SELECT AVG(c1), MAX(c1), MIN(c2), AVG(c3), SUM(c4) FROM t1;
AVG(c1) MAX(c1) MIN(c2) AVG(c3) SUM(c4)
5.4444 10 1 1.0000 9
SELECT AVG(c1), MAX(c1), MIN(c2), AVG(c3), SUM(c4) FROM t3;
AVG(c1) MAX(c1) MIN(c2) AVG(c3) SUM(c4)
5.4444 10 1 1.0000 9
SELECT c1, c2 FROM t1 WHERE c1 > ((SELECT COUNT(*) FROM t1) / 2);
c1 c2
5 1
7 1
8 1
9 1
10 1
SELECT c1, c2 FROM t1 WHERE c1 > ((SELECT COUNT(*) FROM t3) / 2);
c1 c2
5 1
7 1
8 1
9 1
10 1
SELECT COUNT(c2) FROM t1 WHERE c1 > ((SELECT COUNT(*) FROM t1) / 2);
COUNT(c2)
5
SELECT COUNT(c2) FROM t1 WHERE c1 > ((SELECT COUNT(*) FROM t3) / 2);
COUNT(c2)
5
SELECT COUNT(*) FROM t1 WHERE c1 > (SELECT AVG(c1) FROM t1);
COUNT(*)
4
SELECT COUNT(*) FROM t1 WHERE c1 > (SELECT AVG(c1) FROM t3);
COUNT(*)
4
###############################################
#
# Commit the 3 extra connections
#
# Connection 1 REPEATABLE READ
#
########## innodb_isolation_selects.inc ##########
SELECT * FROM t1;
c1 c2 c3 c4
1 1 1 1
2 5 1 1
3 1 1 1
4 1 1 1
5 1 1 1
6 1 1 1
8 1 1 1
9 1 1 1
10 1 1 1
11 100 1 1
SELECT COUNT(*) FROM t1;
COUNT(*)
10
SELECT COUNT(*) FROM t3;
COUNT(*)
10
SELECT COUNT(c1) FROM t1;
COUNT(c1)
10
SELECT COUNT(c2) FROM t1;
COUNT(c2)
10
SELECT COUNT(c3) FROM t1;
COUNT(c3)
10
SELECT SUM(c1) FROM t1;
SUM(c1)
59
SELECT SUM(c2) FROM t1;
SUM(c2)
113
SELECT AVG(c1), MAX(c1), MIN(c2), AVG(c3), SUM(c4) FROM t1;
AVG(c1) MAX(c1) MIN(c2) AVG(c3) SUM(c4)
5.9000 11 1 1.0000 10
SELECT AVG(c1), MAX(c1), MIN(c2), AVG(c3), SUM(c4) FROM t3;
AVG(c1) MAX(c1) MIN(c2) AVG(c3) SUM(c4)
5.9000 11 1 1.0000 10
SELECT c1, c2 FROM t1 WHERE c1 > ((SELECT COUNT(*) FROM t1) / 2);
c1 c2
6 1
8 1
9 1
10 1
11 100
SELECT c1, c2 FROM t1 WHERE c1 > ((SELECT COUNT(*) FROM t3) / 2);
c1 c2
6 1
8 1
9 1
10 1
11 100
SELECT COUNT(c2) FROM t1 WHERE c1 > ((SELECT COUNT(*) FROM t1) / 2);
COUNT(c2)
5
SELECT COUNT(c2) FROM t1 WHERE c1 > ((SELECT COUNT(*) FROM t3) / 2);
COUNT(c2)
5
SELECT COUNT(*) FROM t1 WHERE c1 > (SELECT AVG(c1) FROM t1);
COUNT(*)
5
SELECT COUNT(*) FROM t1 WHERE c1 > (SELECT AVG(c1) FROM t3);
COUNT(*)
5
###############################################
#
# Connection 2 READ COMMITTED
#
########## innodb_isolation_selects.inc ##########
SELECT * FROM t1;
c1 c2 c3 c4
1 1 1 1
2 1 1 1
3 7 1 1
4 1 1 1
5 1 1 1
6 1 1 1
7 1 1 1
9 1 1 1
10 1 1 1
12 1000 1 1
SELECT COUNT(*) FROM t1;
COUNT(*)
10
SELECT COUNT(*) FROM t3;
COUNT(*)
10
SELECT COUNT(c1) FROM t1;
COUNT(c1)
10
SELECT COUNT(c2) FROM t1;
COUNT(c2)
10
SELECT COUNT(c3) FROM t1;
COUNT(c3)
10
SELECT SUM(c1) FROM t1;
SUM(c1)
59
SELECT SUM(c2) FROM t1;
SUM(c2)
1015
SELECT AVG(c1), MAX(c1), MIN(c2), AVG(c3), SUM(c4) FROM t1;
AVG(c1) MAX(c1) MIN(c2) AVG(c3) SUM(c4)
5.9000 12 1 1.0000 10
SELECT AVG(c1), MAX(c1), MIN(c2), AVG(c3), SUM(c4) FROM t3;
AVG(c1) MAX(c1) MIN(c2) AVG(c3) SUM(c4)
5.9000 12 1 1.0000 10
SELECT c1, c2 FROM t1 WHERE c1 > ((SELECT COUNT(*) FROM t1) / 2);
c1 c2
6 1
7 1
9 1
10 1
12 1000
SELECT c1, c2 FROM t1 WHERE c1 > ((SELECT COUNT(*) FROM t3) / 2);
c1 c2
6 1
7 1
9 1
10 1
12 1000
SELECT COUNT(c2) FROM t1 WHERE c1 > ((SELECT COUNT(*) FROM t1) / 2);
COUNT(c2)
5
SELECT COUNT(c2) FROM t1 WHERE c1 > ((SELECT COUNT(*) FROM t3) / 2);
COUNT(c2)
5
SELECT COUNT(*) FROM t1 WHERE c1 > (SELECT AVG(c1) FROM t1);
COUNT(*)
5
SELECT COUNT(*) FROM t1 WHERE c1 > (SELECT AVG(c1) FROM t3);
COUNT(*)
5
###############################################
#
# Connection 3 READ UNCOMMITTED
#
########## innodb_isolation_selects.inc ##########
SELECT * FROM t1;
c1 c2 c3 c4
1 3 1 1
2 5 1 1
3 7 1 1
4 11 1 1
5 1 1 1
10 1 1 1
11 100 1 1
12 1000 1 1
13 10000 1 1
SELECT COUNT(*) FROM t1;
COUNT(*)
9
SELECT COUNT(*) FROM t3;
COUNT(*)
9
SELECT COUNT(c1) FROM t1;
COUNT(c1)
9
SELECT COUNT(c2) FROM t1;
COUNT(c2)
9
SELECT COUNT(c3) FROM t1;
COUNT(c3)
9
SELECT SUM(c1) FROM t1;
SUM(c1)
61
SELECT SUM(c2) FROM t1;
SUM(c2)
11128
SELECT AVG(c1), MAX(c1), MIN(c2), AVG(c3), SUM(c4) FROM t1;
AVG(c1) MAX(c1) MIN(c2) AVG(c3) SUM(c4)
6.7778 13 1 1.0000 9
SELECT AVG(c1), MAX(c1), MIN(c2), AVG(c3), SUM(c4) FROM t3;
AVG(c1) MAX(c1) MIN(c2) AVG(c3) SUM(c4)
6.7778 13 1 1.0000 9
SELECT c1, c2 FROM t1 WHERE c1 > ((SELECT COUNT(*) FROM t1) / 2);
c1 c2
5 1
10 1
11 100
12 1000
13 10000
SELECT c1, c2 FROM t1 WHERE c1 > ((SELECT COUNT(*) FROM t3) / 2);
c1 c2
5 1
10 1
11 100
12 1000
13 10000
SELECT COUNT(c2) FROM t1 WHERE c1 > ((SELECT COUNT(*) FROM t1) / 2);
COUNT(c2)
5
SELECT COUNT(c2) FROM t1 WHERE c1 > ((SELECT COUNT(*) FROM t3) / 2);
COUNT(c2)
5
SELECT COUNT(*) FROM t1 WHERE c1 > (SELECT AVG(c1) FROM t1);
COUNT(*)
4
SELECT COUNT(*) FROM t1 WHERE c1 > (SELECT AVG(c1) FROM t3);
COUNT(*)
4
###############################################
COMMIT;
########## innodb_isolation_selects.inc ##########
SELECT * FROM t1;
c1 c2 c3 c4
1 3 1 1
2 5 1 1
3 7 1 1
4 11 1 1
5 1 1 1
10 1 1 1
11 100 1 1
12 1000 1 1
13 10000 1 1
SELECT COUNT(*) FROM t1;
COUNT(*)
9
SELECT COUNT(*) FROM t3;
COUNT(*)
9
SELECT COUNT(c1) FROM t1;
COUNT(c1)
9
SELECT COUNT(c2) FROM t1;
COUNT(c2)
9
SELECT COUNT(c3) FROM t1;
COUNT(c3)
9
SELECT SUM(c1) FROM t1;
SUM(c1)
61
SELECT SUM(c2) FROM t1;
SUM(c2)
11128
SELECT AVG(c1), MAX(c1), MIN(c2), AVG(c3), SUM(c4) FROM t1;
AVG(c1) MAX(c1) MIN(c2) AVG(c3) SUM(c4)
6.7778 13 1 1.0000 9
SELECT AVG(c1), MAX(c1), MIN(c2), AVG(c3), SUM(c4) FROM t3;
AVG(c1) MAX(c1) MIN(c2) AVG(c3) SUM(c4)
6.7778 13 1 1.0000 9
SELECT c1, c2 FROM t1 WHERE c1 > ((SELECT COUNT(*) FROM t1) / 2);
c1 c2
5 1
10 1
11 100
12 1000
13 10000
SELECT c1, c2 FROM t1 WHERE c1 > ((SELECT COUNT(*) FROM t3) / 2);
c1 c2
5 1
10 1
11 100
12 1000
13 10000
SELECT COUNT(c2) FROM t1 WHERE c1 > ((SELECT COUNT(*) FROM t1) / 2);
COUNT(c2)
5
SELECT COUNT(c2) FROM t1 WHERE c1 > ((SELECT COUNT(*) FROM t3) / 2);
COUNT(c2)
5
SELECT COUNT(*) FROM t1 WHERE c1 > (SELECT AVG(c1) FROM t1);
COUNT(*)
4
SELECT COUNT(*) FROM t1 WHERE c1 > (SELECT AVG(c1) FROM t3);
COUNT(*)
4
###############################################
#
# Connection 2 READ COMMITTED
#
########## innodb_isolation_selects.inc ##########
SELECT * FROM t1;
c1 c2 c3 c4
1 1 1 1
2 1 1 1
3 7 1 1
4 11 1 1
5 1 1 1
6 1 1 1
7 1 1 1
10 1 1 1
12 1000 1 1
13 10000 1 1
SELECT COUNT(*) FROM t1;
COUNT(*)
10
SELECT COUNT(*) FROM t3;
COUNT(*)
10
SELECT COUNT(c1) FROM t1;
COUNT(c1)
10
SELECT COUNT(c2) FROM t1;
COUNT(c2)
10
SELECT COUNT(c3) FROM t1;
COUNT(c3)
10
SELECT SUM(c1) FROM t1;
SUM(c1)
63
SELECT SUM(c2) FROM t1;
SUM(c2)
11024
SELECT AVG(c1), MAX(c1), MIN(c2), AVG(c3), SUM(c4) FROM t1;
AVG(c1) MAX(c1) MIN(c2) AVG(c3) SUM(c4)
6.3000 13 1 1.0000 10
SELECT AVG(c1), MAX(c1), MIN(c2), AVG(c3), SUM(c4) FROM t3;
AVG(c1) MAX(c1) MIN(c2) AVG(c3) SUM(c4)
6.3000 13 1 1.0000 10
SELECT c1, c2 FROM t1 WHERE c1 > ((SELECT COUNT(*) FROM t1) / 2);
c1 c2
6 1
7 1
10 1
12 1000
13 10000
SELECT c1, c2 FROM t1 WHERE c1 > ((SELECT COUNT(*) FROM t3) / 2);
c1 c2
6 1
7 1
10 1
12 1000
13 10000
SELECT COUNT(c2) FROM t1 WHERE c1 > ((SELECT COUNT(*) FROM t1) / 2);
COUNT(c2)
5
SELECT COUNT(c2) FROM t1 WHERE c1 > ((SELECT COUNT(*) FROM t3) / 2);
COUNT(c2)
5
SELECT COUNT(*) FROM t1 WHERE c1 > (SELECT AVG(c1) FROM t1);
COUNT(*)
4
SELECT COUNT(*) FROM t1 WHERE c1 > (SELECT AVG(c1) FROM t3);
COUNT(*)
4
###############################################
COMMIT;
########## innodb_isolation_selects.inc ##########
SELECT * FROM t1;
c1 c2 c3 c4
1 1 1 1
2 1 1 1
3 7 1 1
4 11 1 1
5 1 1 1
6 1 1 1
7 1 1 1
10 1 1 1
12 1000 1 1
13 10000 1 1
SELECT COUNT(*) FROM t1;
COUNT(*)
10
SELECT COUNT(*) FROM t3;
COUNT(*)
10
SELECT COUNT(c1) FROM t1;
COUNT(c1)
10
SELECT COUNT(c2) FROM t1;
COUNT(c2)
10
SELECT COUNT(c3) FROM t1;
COUNT(c3)
10
SELECT SUM(c1) FROM t1;
SUM(c1)
63
SELECT SUM(c2) FROM t1;
SUM(c2)
11024
SELECT AVG(c1), MAX(c1), MIN(c2), AVG(c3), SUM(c4) FROM t1;
AVG(c1) MAX(c1) MIN(c2) AVG(c3) SUM(c4)
6.3000 13 1 1.0000 10
SELECT AVG(c1), MAX(c1), MIN(c2), AVG(c3), SUM(c4) FROM t3;
AVG(c1) MAX(c1) MIN(c2) AVG(c3) SUM(c4)
6.3000 13 1 1.0000 10
SELECT c1, c2 FROM t1 WHERE c1 > ((SELECT COUNT(*) FROM t1) / 2);
c1 c2
6 1
7 1
10 1
12 1000
13 10000
SELECT c1, c2 FROM t1 WHERE c1 > ((SELECT COUNT(*) FROM t3) / 2);
c1 c2
6 1
7 1
10 1
12 1000
13 10000
SELECT COUNT(c2) FROM t1 WHERE c1 > ((SELECT COUNT(*) FROM t1) / 2);
COUNT(c2)
5
SELECT COUNT(c2) FROM t1 WHERE c1 > ((SELECT COUNT(*) FROM t3) / 2);
COUNT(c2)
5
SELECT COUNT(*) FROM t1 WHERE c1 > (SELECT AVG(c1) FROM t1);
COUNT(*)
4
SELECT COUNT(*) FROM t1 WHERE c1 > (SELECT AVG(c1) FROM t3);
COUNT(*)
4
###############################################
#
# Connection 1 REPEATABLE READ
#
########## innodb_isolation_selects.inc ##########
SELECT * FROM t1;
c1 c2 c3 c4
1 1 1 1
2 5 1 1
3 1 1 1
4 1 1 1
5 1 1 1
6 1 1 1
8 1 1 1
9 1 1 1
10 1 1 1
11 100 1 1
SELECT COUNT(*) FROM t1;
COUNT(*)
10
SELECT COUNT(*) FROM t3;
COUNT(*)
10
SELECT COUNT(c1) FROM t1;
COUNT(c1)
10
SELECT COUNT(c2) FROM t1;
COUNT(c2)
10
SELECT COUNT(c3) FROM t1;
COUNT(c3)
10
SELECT SUM(c1) FROM t1;
SUM(c1)
59
SELECT SUM(c2) FROM t1;
SUM(c2)
113
SELECT AVG(c1), MAX(c1), MIN(c2), AVG(c3), SUM(c4) FROM t1;
AVG(c1) MAX(c1) MIN(c2) AVG(c3) SUM(c4)
5.9000 11 1 1.0000 10
SELECT AVG(c1), MAX(c1), MIN(c2), AVG(c3), SUM(c4) FROM t3;
AVG(c1) MAX(c1) MIN(c2) AVG(c3) SUM(c4)
5.9000 11 1 1.0000 10
SELECT c1, c2 FROM t1 WHERE c1 > ((SELECT COUNT(*) FROM t1) / 2);
c1 c2
6 1
8 1
9 1
10 1
11 100
SELECT c1, c2 FROM t1 WHERE c1 > ((SELECT COUNT(*) FROM t3) / 2);
c1 c2
6 1
8 1
9 1
10 1
11 100
SELECT COUNT(c2) FROM t1 WHERE c1 > ((SELECT COUNT(*) FROM t1) / 2);
COUNT(c2)
5
SELECT COUNT(c2) FROM t1 WHERE c1 > ((SELECT COUNT(*) FROM t3) / 2);
COUNT(c2)
5
SELECT COUNT(*) FROM t1 WHERE c1 > (SELECT AVG(c1) FROM t1);
COUNT(*)
5
SELECT COUNT(*) FROM t1 WHERE c1 > (SELECT AVG(c1) FROM t3);
COUNT(*)
5
###############################################
#
# Select the first 5 records FOR UPDATE using count(*) in a subquery.
# The second record is still pending so we get a lock timeout.
#
SET innodb_lock_wait_timeout = 1;
SELECT c1, c2 FROM t1 WHERE c1 < ((SELECT COUNT(*) FROM t1) / 2) FOR UPDATE;
ERROR HY000: Lock wait timeout exceeded; try restarting transaction
SELECT COUNT(*) FROM t1 FOR UPDATE;
ERROR HY000: Lock wait timeout exceeded; try restarting transaction
COMMIT;
########## innodb_isolation_selects.inc ##########
SELECT * FROM t1;
c1 c2 c3 c4
1 1 1 1
2 5 1 1
3 7 1 1
4 11 1 1
5 1 1 1
6 1 1 1
10 1 1 1
11 100 1 1
12 1000 1 1
13 10000 1 1
SELECT COUNT(*) FROM t1;
COUNT(*)
10
SELECT COUNT(*) FROM t3;
COUNT(*)
10
SELECT COUNT(c1) FROM t1;
COUNT(c1)
10
SELECT COUNT(c2) FROM t1;
COUNT(c2)
10
SELECT COUNT(c3) FROM t1;
COUNT(c3)
10
SELECT SUM(c1) FROM t1;
SUM(c1)
67
SELECT SUM(c2) FROM t1;
SUM(c2)
11127
SELECT AVG(c1), MAX(c1), MIN(c2), AVG(c3), SUM(c4) FROM t1;
AVG(c1) MAX(c1) MIN(c2) AVG(c3) SUM(c4)
6.7000 13 1 1.0000 10
SELECT AVG(c1), MAX(c1), MIN(c2), AVG(c3), SUM(c4) FROM t3;
AVG(c1) MAX(c1) MIN(c2) AVG(c3) SUM(c4)
6.7000 13 1 1.0000 10
SELECT c1, c2 FROM t1 WHERE c1 > ((SELECT COUNT(*) FROM t1) / 2);
c1 c2
6 1
10 1
11 100
12 1000
13 10000
SELECT c1, c2 FROM t1 WHERE c1 > ((SELECT COUNT(*) FROM t3) / 2);
c1 c2
6 1
10 1
11 100
12 1000
13 10000
SELECT COUNT(c2) FROM t1 WHERE c1 > ((SELECT COUNT(*) FROM t1) / 2);
COUNT(c2)
5
SELECT COUNT(c2) FROM t1 WHERE c1 > ((SELECT COUNT(*) FROM t3) / 2);
COUNT(c2)
5
SELECT COUNT(*) FROM t1 WHERE c1 > (SELECT AVG(c1) FROM t1);
COUNT(*)
4
SELECT COUNT(*) FROM t1 WHERE c1 > (SELECT AVG(c1) FROM t3);
COUNT(*)
4
###############################################
#
# Show The EXPLAIN output for these queries;
#
ANALYZE TABLE t1;
Table Op Msg_type Msg_text
test.t1 analyze status OK
ANALYZE TABLE t2;
Table Op Msg_type Msg_text
test.t2 analyze status OK
ANALYZE TABLE t3;
Table Op Msg_type Msg_text
test.t3 analyze status OK
EXPLAIN SELECT * FROM t1;
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 NULL ALL NULL NULL NULL NULL # 100.00 NULL
Warnings:
Note 1003 /* select#1 */ select `test`.`t1`.`c1` AS `c1`,`test`.`t1`.`c2` AS `c2`,`test`.`t1`.`c3` AS `c3`,`test`.`t1`.`c4` AS `c4` from `test`.`t1`
EXPLAIN SELECT COUNT(*) FROM t1;
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 NULL index NULL k2 5 NULL # 100.00 Using index
Warnings:
Note 1003 /* select#1 */ select count(0) AS `COUNT(*)` from `test`.`t1`
EXPLAIN SELECT COUNT(*) FROM t3;
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t3 p0,p1,p2,p3 index NULL k2 5 NULL # 100.00 Using index
Warnings:
Note 1003 /* select#1 */ select count(0) AS `COUNT(*)` from `test`.`t3`
EXPLAIN SELECT COUNT(c1) FROM t1;
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 NULL index NULL k2 5 NULL # 100.00 Using index
Warnings:
Note 1003 /* select#1 */ select count(`test`.`t1`.`c1`) AS `COUNT(c1)` from `test`.`t1`
EXPLAIN SELECT COUNT(c2) FROM t1;
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 NULL index NULL k2 5 NULL # 100.00 Using index
Warnings:
Note 1003 /* select#1 */ select count(`test`.`t1`.`c2`) AS `COUNT(c2)` from `test`.`t1`
EXPLAIN SELECT COUNT(c3) FROM t1;
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 NULL ALL NULL NULL NULL NULL # 100.00 NULL
Warnings:
Note 1003 /* select#1 */ select count(`test`.`t1`.`c3`) AS `COUNT(c3)` from `test`.`t1`
EXPLAIN SELECT SUM(c1) FROM t1;
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 NULL index NULL k2 5 NULL # 100.00 Using index
Warnings:
Note 1003 /* select#1 */ select sum(`test`.`t1`.`c1`) AS `SUM(c1)` from `test`.`t1`
EXPLAIN SELECT SUM(c2) FROM t1;
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 NULL index NULL k2 5 NULL # 100.00 Using index
Warnings:
Note 1003 /* select#1 */ select sum(`test`.`t1`.`c2`) AS `SUM(c2)` from `test`.`t1`
EXPLAIN SELECT AVG(c1), MAX(c1), MIN(c2), AVG(c3), SUM(c4) FROM t1;
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 NULL ALL NULL NULL NULL NULL # 100.00 NULL
Warnings:
Note 1003 /* select#1 */ select avg(`test`.`t1`.`c1`) AS `AVG(c1)`,max(`test`.`t1`.`c1`) AS `MAX(c1)`,min(`test`.`t1`.`c2`) AS `MIN(c2)`,avg(`test`.`t1`.`c3`) AS `AVG(c3)`,sum(`test`.`t1`.`c4`) AS `SUM(c4)` from `test`.`t1`
EXPLAIN SELECT AVG(c1), MAX(c1), MIN(c2), AVG(c3), SUM(c4) FROM t3;
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t3 p0,p1,p2,p3 ALL NULL NULL NULL NULL # 100.00 NULL
Warnings:
Note 1003 /* select#1 */ select avg(`test`.`t3`.`c1`) AS `AVG(c1)`,max(`test`.`t3`.`c1`) AS `MAX(c1)`,min(`test`.`t3`.`c2`) AS `MIN(c2)`,avg(`test`.`t3`.`c3`) AS `AVG(c3)`,sum(`test`.`t3`.`c4`) AS `SUM(c4)` from `test`.`t3`
EXPLAIN SELECT c1, c2 FROM t1 WHERE c1 > ((SELECT COUNT(*) FROM t1) / 2);
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t1 NULL range PRIMARY PRIMARY 4 NULL # 100.00 Using where
2 SUBQUERY t1 NULL index NULL k2 5 NULL # 100.00 Using index
Warnings:
Note 1003 /* select#1 */ select `test`.`t1`.`c1` AS `c1`,`test`.`t1`.`c2` AS `c2` from `test`.`t1` where (`test`.`t1`.`c1` > <cache>(((/* select#2 */ select count(0) from `test`.`t1`) / 2)))
EXPLAIN SELECT c1, c2 FROM t1 WHERE c1 > ((SELECT COUNT(*) FROM t3) / 2);
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t1 NULL range PRIMARY PRIMARY 4 NULL # 100.00 Using where
2 SUBQUERY t3 p0,p1,p2,p3 index NULL k2 5 NULL # 100.00 Using index
Warnings:
Note 1003 /* select#1 */ select `test`.`t1`.`c1` AS `c1`,`test`.`t1`.`c2` AS `c2` from `test`.`t1` where (`test`.`t1`.`c1` > <cache>(((/* select#2 */ select count(0) from `test`.`t3`) / 2)))
EXPLAIN SELECT COUNT(c2) FROM t1 WHERE c1 > ((SELECT COUNT(*) FROM t1) / 2);
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t1 NULL range PRIMARY PRIMARY 4 NULL # 100.00 Using where
2 SUBQUERY t1 NULL index NULL k2 5 NULL # 100.00 Using index
Warnings:
Note 1003 /* select#1 */ select count(`test`.`t1`.`c2`) AS `COUNT(c2)` from `test`.`t1` where (`test`.`t1`.`c1` > <cache>(((/* select#2 */ select count(0) from `test`.`t1`) / 2)))
EXPLAIN SELECT COUNT(c2) FROM t1 WHERE c1 > ((SELECT COUNT(*) FROM t3) / 2);
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t1 NULL range PRIMARY PRIMARY 4 NULL # 100.00 Using where
2 SUBQUERY t3 p0,p1,p2,p3 index NULL k2 5 NULL # 100.00 Using index
Warnings:
Note 1003 /* select#1 */ select count(`test`.`t1`.`c2`) AS `COUNT(c2)` from `test`.`t1` where (`test`.`t1`.`c1` > <cache>(((/* select#2 */ select count(0) from `test`.`t3`) / 2)))
EXPLAIN SELECT COUNT(*) FROM t1 WHERE c1 > (SELECT AVG(c1) FROM t1);
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t1 NULL range PRIMARY PRIMARY 4 NULL # 100.00 Using where; Using index
2 SUBQUERY t1 NULL index NULL k2 5 NULL # 100.00 Using index
Warnings:
Note 1003 /* select#1 */ select count(0) AS `COUNT(*)` from `test`.`t1` where (`test`.`t1`.`c1` > (/* select#2 */ select avg(`test`.`t1`.`c1`) from `test`.`t1`))
EXPLAIN SELECT COUNT(*) FROM t1 WHERE c1 > (SELECT AVG(c1) FROM t3);
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t1 NULL range PRIMARY PRIMARY 4 NULL # 100.00 Using where; Using index
2 SUBQUERY t3 p0,p1,p2,p3 index NULL k2 5 NULL # 100.00 Using index
Warnings:
Note 1003 /* select#1 */ select count(0) AS `COUNT(*)` from `test`.`t1` where (`test`.`t1`.`c1` > (/* select#2 */ select avg(`test`.`t3`.`c1`) from `test`.`t3`))
#
# Make all indexes in t2 obsolete to the active repeatable read transaction
# in the default connection.
#
ALTER TABLE t2 row_format=redundant;
#
# Connection default REPEATABLE READ
# Do more DML in the default REPEATABLE READ transaction in order to use recently committed records.
#
########## innodb_isolation_selects.inc ##########
SELECT * FROM t1;
c1 c2 c3 c4
1 3 1 1
2 1 1 1
3 1 1 1
4 1 1 1
5 1 1 1
7 1 1 1
8 1 1 1
9 1 1 1
10 1 1 1
SELECT COUNT(*) FROM t1;
COUNT(*)
9
SELECT COUNT(*) FROM t3;
COUNT(*)
9
SELECT COUNT(c1) FROM t1;
COUNT(c1)
9
SELECT COUNT(c2) FROM t1;
COUNT(c2)
9
SELECT COUNT(c3) FROM t1;
COUNT(c3)
9
SELECT SUM(c1) FROM t1;
SUM(c1)
49
SELECT SUM(c2) FROM t1;
SUM(c2)
11
SELECT AVG(c1), MAX(c1), MIN(c2), AVG(c3), SUM(c4) FROM t1;
AVG(c1) MAX(c1) MIN(c2) AVG(c3) SUM(c4)
5.4444 10 1 1.0000 9
SELECT AVG(c1), MAX(c1), MIN(c2), AVG(c3), SUM(c4) FROM t3;
AVG(c1) MAX(c1) MIN(c2) AVG(c3) SUM(c4)
5.4444 10 1 1.0000 9
SELECT c1, c2 FROM t1 WHERE c1 > ((SELECT COUNT(*) FROM t1) / 2);
c1 c2
5 1
7 1
8 1
9 1
10 1
SELECT c1, c2 FROM t1 WHERE c1 > ((SELECT COUNT(*) FROM t3) / 2);
c1 c2
5 1
7 1
8 1
9 1
10 1
SELECT COUNT(c2) FROM t1 WHERE c1 > ((SELECT COUNT(*) FROM t1) / 2);
COUNT(c2)
5
SELECT COUNT(c2) FROM t1 WHERE c1 > ((SELECT COUNT(*) FROM t3) / 2);
COUNT(c2)
5
SELECT COUNT(*) FROM t1 WHERE c1 > (SELECT AVG(c1) FROM t1);
COUNT(*)
4
SELECT COUNT(*) FROM t1 WHERE c1 > (SELECT AVG(c1) FROM t3);
COUNT(*)
4
###############################################
UPDATE t1 SET c4 = c2 * 10;
affected rows: 9
info: Rows matched: 9 Changed: 9 Warnings: 0
UPDATE t3 SET c4 = c2 * 10;
affected rows: 9
info: Rows matched: 9 Changed: 9 Warnings: 0
########## innodb_isolation_selects.inc ##########
SELECT * FROM t1;
c1 c2 c3 c4
1 3 1 30
2 5 1 50
3 7 1 70
4 11 1 110
5 1 1 10
7 1 1 1
8 1 1 1
9 1 1 1
10 1 1 10
11 100 1 1000
12 1000 1 10000
13 10000 1 100000
SELECT COUNT(*) FROM t1;
COUNT(*)
12
SELECT COUNT(*) FROM t3;
COUNT(*)
12
SELECT COUNT(c1) FROM t1;
COUNT(c1)
12
SELECT COUNT(c2) FROM t1;
COUNT(c2)
12
SELECT COUNT(c3) FROM t1;
COUNT(c3)
12
SELECT SUM(c1) FROM t1;
SUM(c1)
85
SELECT SUM(c2) FROM t1;
SUM(c2)
11131
SELECT AVG(c1), MAX(c1), MIN(c2), AVG(c3), SUM(c4) FROM t1;
AVG(c1) MAX(c1) MIN(c2) AVG(c3) SUM(c4)
7.0833 13 1 1.0000 111283
SELECT AVG(c1), MAX(c1), MIN(c2), AVG(c3), SUM(c4) FROM t3;
AVG(c1) MAX(c1) MIN(c2) AVG(c3) SUM(c4)
7.0833 13 1 1.0000 111223
SELECT c1, c2 FROM t1 WHERE c1 > ((SELECT COUNT(*) FROM t1) / 2);
c1 c2
7 1
8 1
9 1
10 1
11 100
12 1000
13 10000
SELECT c1, c2 FROM t1 WHERE c1 > ((SELECT COUNT(*) FROM t3) / 2);
c1 c2
7 1
8 1
9 1
10 1
11 100
12 1000
13 10000
SELECT COUNT(c2) FROM t1 WHERE c1 > ((SELECT COUNT(*) FROM t1) / 2);
COUNT(c2)
7
SELECT COUNT(c2) FROM t1 WHERE c1 > ((SELECT COUNT(*) FROM t3) / 2);
COUNT(c2)
7
SELECT COUNT(*) FROM t1 WHERE c1 > (SELECT AVG(c1) FROM t1);
COUNT(*)
6
SELECT COUNT(*) FROM t1 WHERE c1 > (SELECT AVG(c1) FROM t3);
COUNT(*)
6
###############################################
#
# Table t2 has been altered to a new row format.
# The index should not be useable.
#
SELECT COUNT(*) FROM t2;
ERROR HY000: Table definition has changed, please retry transaction
SELECT * FROM t2;
ERROR HY000: Table definition has changed, please retry transaction
COMMIT;
SELECT COUNT(*) FROM t2;
COUNT(*)
10
########## innodb_isolation_selects.inc ##########
SELECT * FROM t1;
c1 c2 c3 c4
1 3 1 30
2 5 1 50
3 7 1 70
4 11 1 110
5 1 1 10
10 1 1 10
11 100 1 1000
12 1000 1 10000
13 10000 1 100000
SELECT COUNT(*) FROM t1;
COUNT(*)
9
SELECT COUNT(*) FROM t3;
COUNT(*)
9
SELECT COUNT(c1) FROM t1;
COUNT(c1)
9
SELECT COUNT(c2) FROM t1;
COUNT(c2)
9
SELECT COUNT(c3) FROM t1;
COUNT(c3)
9
SELECT SUM(c1) FROM t1;
SUM(c1)
61
SELECT SUM(c2) FROM t1;
SUM(c2)
11128
SELECT AVG(c1), MAX(c1), MIN(c2), AVG(c3), SUM(c4) FROM t1;
AVG(c1) MAX(c1) MIN(c2) AVG(c3) SUM(c4)
6.7778 13 1 1.0000 111280
SELECT AVG(c1), MAX(c1), MIN(c2), AVG(c3), SUM(c4) FROM t3;
AVG(c1) MAX(c1) MIN(c2) AVG(c3) SUM(c4)
6.7778 13 1 1.0000 111220
SELECT c1, c2 FROM t1 WHERE c1 > ((SELECT COUNT(*) FROM t1) / 2);
c1 c2
5 1
10 1
11 100
12 1000
13 10000
SELECT c1, c2 FROM t1 WHERE c1 > ((SELECT COUNT(*) FROM t3) / 2);
c1 c2
5 1
10 1
11 100
12 1000
13 10000
SELECT COUNT(c2) FROM t1 WHERE c1 > ((SELECT COUNT(*) FROM t1) / 2);
COUNT(c2)
5
SELECT COUNT(c2) FROM t1 WHERE c1 > ((SELECT COUNT(*) FROM t3) / 2);
COUNT(c2)
5
SELECT COUNT(*) FROM t1 WHERE c1 > (SELECT AVG(c1) FROM t1);
COUNT(*)
4
SELECT COUNT(*) FROM t1 WHERE c1 > (SELECT AVG(c1) FROM t3);
COUNT(*)
4
###############################################
#
# Connection 2
#
########## innodb_isolation_selects.inc ##########
SELECT * FROM t1;
c1 c2 c3 c4
1 3 1 30
2 5 1 50
3 7 1 70
4 11 1 110
5 1 1 10
10 1 1 10
11 100 1 1000
12 1000 1 10000
13 10000 1 100000
SELECT COUNT(*) FROM t1;
COUNT(*)
9
SELECT COUNT(*) FROM t3;
COUNT(*)
9
SELECT COUNT(c1) FROM t1;
COUNT(c1)
9
SELECT COUNT(c2) FROM t1;
COUNT(c2)
9
SELECT COUNT(c3) FROM t1;
COUNT(c3)
9
SELECT SUM(c1) FROM t1;
SUM(c1)
61
SELECT SUM(c2) FROM t1;
SUM(c2)
11128
SELECT AVG(c1), MAX(c1), MIN(c2), AVG(c3), SUM(c4) FROM t1;
AVG(c1) MAX(c1) MIN(c2) AVG(c3) SUM(c4)
6.7778 13 1 1.0000 111280
SELECT AVG(c1), MAX(c1), MIN(c2), AVG(c3), SUM(c4) FROM t3;
AVG(c1) MAX(c1) MIN(c2) AVG(c3) SUM(c4)
6.7778 13 1 1.0000 111220
SELECT c1, c2 FROM t1 WHERE c1 > ((SELECT COUNT(*) FROM t1) / 2);
c1 c2
5 1
10 1
11 100
12 1000
13 10000
SELECT c1, c2 FROM t1 WHERE c1 > ((SELECT COUNT(*) FROM t3) / 2);
c1 c2
5 1
10 1
11 100
12 1000
13 10000
SELECT COUNT(c2) FROM t1 WHERE c1 > ((SELECT COUNT(*) FROM t1) / 2);
COUNT(c2)
5
SELECT COUNT(c2) FROM t1 WHERE c1 > ((SELECT COUNT(*) FROM t3) / 2);
COUNT(c2)
5
SELECT COUNT(*) FROM t1 WHERE c1 > (SELECT AVG(c1) FROM t1);
COUNT(*)
4
SELECT COUNT(*) FROM t1 WHERE c1 > (SELECT AVG(c1) FROM t3);
COUNT(*)
4
###############################################
#
# Try COUNT(*) on a DISCARDED table.
#
CREATE TABLE t4 LIKE t1;
INSERT INTO t4 (SELECT * FROM t1);
SELECT COUNT(*) FROM t4;
COUNT(*)
9
ALTER TABLE t4 DISCARD TABLESPACE;
SELECT COUNT(*) FROM t4;
ERROR HY000: Tablespace has been discarded for table 't4'
#
# Test the interaction of a repeatable read transaction
# to changes that happen outside its view.
#
CREATE TABLE t5 (a INT AUTO_INCREMENT PRIMARY KEY, b TEXT, aa INT, bb TEXT) Engine=InnoDB;
INSERT INTO t5(b) VALUES ("inserted by client 1");
INSERT INTO t5(b) VALUES ("inserted by client 1");
INSERT INTO t5(b) VALUES ("inserted by client 1");
INSERT INTO t5(b) VALUES ("inserted by client 1");
UPDATE t5 SET aa=a, bb=b;
CREATE TABLE t6 (a INT AUTO_INCREMENT PRIMARY KEY, b TEXT, aa INT, bb TEXT) Engine=InnoDB;
INSERT INTO t6(b) VALUES ("inserted by client 1");
INSERT INTO t6(b) VALUES ("inserted by client 1");
INSERT INTO t6(b) VALUES ("inserted by client 1");
INSERT INTO t6(b) VALUES ("inserted by client 1");
UPDATE t6 SET aa=a, bb=b;
CREATE TABLE t7 (a INT AUTO_INCREMENT PRIMARY KEY, b TEXT, aa INT, bb TEXT) Engine=InnoDB;
INSERT INTO t7(b) VALUES ("inserted by client 1");
INSERT INTO t7(b) VALUES ("inserted by client 1");
INSERT INTO t7(b) VALUES ("inserted by client 1");
INSERT INTO t7(b) VALUES ("inserted by client 1");
UPDATE t7 SET aa=a, bb=b;
BEGIN;
SELECT * FROM t5;
a b aa bb
1 inserted by client 1 1 inserted by client 1
2 inserted by client 1 2 inserted by client 1
3 inserted by client 1 3 inserted by client 1
4 inserted by client 1 4 inserted by client 1
SELECT COUNT(*) FROM t5;
COUNT(*)
4
SELECT * FROM t6;
a b aa bb
1 inserted by client 1 1 inserted by client 1
2 inserted by client 1 2 inserted by client 1
3 inserted by client 1 3 inserted by client 1
4 inserted by client 1 4 inserted by client 1
SELECT COUNT(*) FROM t6;
COUNT(*)
4
SELECT * FROM t7;
a b aa bb
1 inserted by client 1 1 inserted by client 1
2 inserted by client 1 2 inserted by client 1
3 inserted by client 1 3 inserted by client 1
4 inserted by client 1 4 inserted by client 1
SELECT COUNT(*) FROM t7;
COUNT(*)
4
#
# Connection 1
#
INSERT INTO t5(b) VALUES ("inserted by client 2");
UPDATE t5 SET a = 10 where a = 1;
UPDATE t5 SET b = "updated by client 2" where a = 2;
DELETE FROM t5 WHERE a = 3;
SELECT * FROM t5;
a b aa bb
2 updated by client 2 2 inserted by client 1
4 inserted by client 1 4 inserted by client 1
5 inserted by client 2 NULL NULL
10 inserted by client 1 1 inserted by client 1
SELECT COUNT(*) FROM t5;
COUNT(*)
4
INSERT INTO t6(b) VALUES ("inserted by client 2");
UPDATE t6 SET a = 10 where a = 1;
UPDATE t6 SET b = "updated by client 2" where a = 2;
DELETE FROM t6 WHERE a = 3;
SELECT * FROM t6;
a b aa bb
2 updated by client 2 2 inserted by client 1
4 inserted by client 1 4 inserted by client 1
5 inserted by client 2 NULL NULL
10 inserted by client 1 1 inserted by client 1
SELECT COUNT(*) FROM t6;
COUNT(*)
4
INSERT INTO t7(b) VALUES ("inserted by client 2");
UPDATE t7 SET a = 10 where a = 1;
UPDATE t7 SET b = "updated by client 2" where a = 2;
DELETE FROM t7 WHERE a = 3;
SELECT * FROM t7;
a b aa bb
2 updated by client 2 2 inserted by client 1
4 inserted by client 1 4 inserted by client 1
5 inserted by client 2 NULL NULL
10 inserted by client 1 1 inserted by client 1
SELECT COUNT(*) FROM t7;
COUNT(*)
4
#
# Connection default
#
SELECT * FROM t5;
a b aa bb
1 inserted by client 1 1 inserted by client 1
2 inserted by client 1 2 inserted by client 1
3 inserted by client 1 3 inserted by client 1
4 inserted by client 1 4 inserted by client 1
INSERT INTO t5(b) VALUES ("inserted by client 1");
SELECT * FROM t5;
a b aa bb
1 inserted by client 1 1 inserted by client 1
2 inserted by client 1 2 inserted by client 1
3 inserted by client 1 3 inserted by client 1
4 inserted by client 1 4 inserted by client 1
6 inserted by client 1 NULL NULL
UPDATE t5 SET a = a + 100;
SELECT * FROM t5;
a b aa bb
1 inserted by client 1 1 inserted by client 1
3 inserted by client 1 3 inserted by client 1
102 updated by client 2 2 inserted by client 1
104 inserted by client 1 4 inserted by client 1
105 inserted by client 2 NULL NULL
106 inserted by client 1 NULL NULL
110 inserted by client 1 1 inserted by client 1
SELECT COUNT(*) FROM t5;
COUNT(*)
7
UPDATE t6 SET b = "updated by client 2";
SELECT * FROM t6;
a b aa bb
1 inserted by client 1 1 inserted by client 1
2 updated by client 2 2 inserted by client 1
3 inserted by client 1 3 inserted by client 1
4 updated by client 2 4 inserted by client 1
5 updated by client 2 NULL NULL
10 updated by client 2 1 inserted by client 1
SELECT COUNT(*) FROM t6;
COUNT(*)
6
DELETE FROM t7;
SELECT * FROM t7;
a b aa bb
1 inserted by client 1 1 inserted by client 1
3 inserted by client 1 3 inserted by client 1
SELECT COUNT(*) FROM t7;
COUNT(*)
2
COMMIT;
SELECT * FROM t5;
a b aa bb
102 updated by client 2 2 inserted by client 1
104 inserted by client 1 4 inserted by client 1
105 inserted by client 2 NULL NULL
106 inserted by client 1 NULL NULL
110 inserted by client 1 1 inserted by client 1
SELECT COUNT(*) FROM t5;
COUNT(*)
5
SELECT * FROM t6;
a b aa bb
2 updated by client 2 2 inserted by client 1
4 updated by client 2 4 inserted by client 1
5 updated by client 2 NULL NULL
10 updated by client 2 1 inserted by client 1
SELECT COUNT(*) FROM t6;
COUNT(*)
4
SELECT * FROM t7;
a b aa bb
SELECT COUNT(*) FROM t7;
COUNT(*)
0
#
# Cleanup
#
DROP TABLE t1,t2,t3,t4,t5,t6,t7;
#
# Bug #23596760: FORCE INDEX IS SKIPPED WHILE EXECUTING SELECT COUNT(*)
#
CREATE TABLE t1(c1 INT NOT NULL PRIMARY KEY,
c2 INT NOT NULL DEFAULT 1,
c3 char(20) DEFAULT '',
KEY c2_idx (c2));
INSERT INTO t1(c1) VALUES (1), (2), (3);
INSERT INTO t1(c1) SELECT c1 + 10 FROM t1;
INSERT INTO t1(c1) SELECT c1 + 100 FROM t1;
CREATE TABLE t2 SELECT * FROM t1;
ANALYZE TABLE t1;
Table Op Msg_type Msg_text
test.t1 analyze status OK
ANALYZE TABLE t2;
Table Op Msg_type Msg_text
test.t2 analyze status OK
EXPLAIN SELECT COUNT(*) FROM t1;
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 NULL index NULL c2_idx 4 NULL # 100.00 Using index
Warnings:
Note 1003 /* select#1 */ select count(0) AS `COUNT(*)` from `test`.`t1`
EXPLAIN SELECT COUNT(*) FROM t1 FORCE INDEX(c2_idx);
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 NULL index NULL c2_idx 4 NULL # 100.00 Using index
Warnings:
Note 1003 /* select#1 */ select count(0) AS `COUNT(*)` from `test`.`t1` FORCE INDEX (`c2_idx`)
EXPLAIN SELECT COUNT(*) FROM t1, t2;
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 NULL index NULL c2_idx 4 NULL # 100.00 Using index
1 SIMPLE t2 NULL ALL NULL NULL NULL NULL # 100.00 Using join buffer (Block Nested Loop)
Warnings:
Note 1003 /* select#1 */ select count(0) AS `COUNT(*)` from `test`.`t1` join `test`.`t2`
EXPLAIN SELECT COUNT(*) FROM t1 FORCE INDEX(c2_idx), t2;
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 NULL index NULL c2_idx 4 NULL # 100.00 Using index
1 SIMPLE t2 NULL ALL NULL NULL NULL NULL # 100.00 Using join buffer (Block Nested Loop)
Warnings:
Note 1003 /* select#1 */ select count(0) AS `COUNT(*)` from `test`.`t1` FORCE INDEX (`c2_idx`) join `test`.`t2`
DROP TABLE t1, t2;