1
drop table if exists t1;
2
SET SQL_SELECT_LIMIT=4, MAX_JOIN_SIZE=9;
3
create table t1 (a int auto_increment primary key, b char(20));
4
insert into t1 values(1,"test");
5
SELECT SQL_BUFFER_RESULT * from t1;
8
update t1 set b="a" where a=1;
9
delete from t1 where a=1;
10
insert into t1 values(1,"test"),(2,"test2");
11
SELECT SQL_BUFFER_RESULT * from t1;
15
update t1 set b="a" where a=1;
16
select 1 from t1 CROSS JOIN t1 as t2 CROSS JOIN t1 as t3;
23
update t1 set b="a" where b="test";
25
delete from t1 where b="test";
26
delete from t1 where a+0=1;
27
select 1 from t1 CROSS JOIN t1 as t2 CROSS JOIN t1 as t3 CROSS JOIN t1 as t4 CROSS JOIN t1 as t5;
29
update t1 set b="a" limit 1;
30
update t1 set b="a" where b="b" limit 2;
31
delete from t1 where b="test" limit 1;
32
delete from t1 where a+0=1 limit 2;
33
alter table t1 add key b (b);
35
SELECT @@MAX_JOIN_SIZE, @@SQL_BIG_SELECTS;
36
@@MAX_JOIN_SIZE @@SQL_BIG_SELECTS
38
insert into t1 values (null,"a"),(null,"a"),(null,"a"),(null,"a"),(null,"a"),(null,"a"),(null,"a"),(null,"a"),(null,"a"),(null,"a");
39
SELECT * from t1 order by a;
40
ERROR 42000: The SELECT would examine more than MAX_JOIN_SIZE rows; check your WHERE and use SET SQL_BIG_SELECTS=1 or SET MAX_JOIN_SIZE=# if the SELECT is okay
41
SET SQL_BIG_SELECTS=1;
42
SELECT * from t1 order by a;
50
ERROR 42000: The SELECT would examine more than MAX_JOIN_SIZE rows; check your WHERE and use SET SQL_BIG_SELECTS=1 or SET MAX_JOIN_SIZE=# if the SELECT is okay
51
SET MAX_JOIN_SIZE=DEFAULT;
59
Table Op Msg_type Msg_text
60
test.t1 analyze status OK
61
insert into t1 values (null,"a"),(null,"a"),(null,"a"),(null,"a"),(null,"a"),(null,"a"),(null,"a"),(null,"a"),(null,"a"),(null,"a");
62
explain select STRAIGHT_JOIN * from t1,t1 as t2 where t1.b=t2.b;
63
id select_type table type possible_keys key key_len ref rows Extra
64
1 SIMPLE t1 index b PRIMARY 4 NULL 20
65
1 SIMPLE t2 ref b b 83 test.t1.b 10 Using where; Using index
66
set MAX_SEEKS_FOR_KEY=1;
67
explain select STRAIGHT_JOIN * from t1,t1 as t2 where t1.b=t2.b;
68
id select_type table type possible_keys key key_len ref rows Extra
69
1 SIMPLE t1 index b PRIMARY 4 NULL 20
70
1 SIMPLE t2 ref b b 83 test.t1.b 10 Using where; Using index
71
SET MAX_SEEKS_FOR_KEY=DEFAULT;
73
create table t1 (a int);
74
insert into t1 values (1),(2),(3),(4),(5);
75
insert into t1 select * from t1;
76
insert into t1 select * from t1;
77
insert into t1 select * from t1;
78
set local max_join_size=8;
79
select * from (select * from t1) x;
80
ERROR 42000: The SELECT would examine more than MAX_JOIN_SIZE rows; check your WHERE and use SET SQL_BIG_SELECTS=1 or SET MAX_JOIN_SIZE=# if the SELECT is okay
81
set local max_join_size=1;
82
select * from (select a.a as aa, b.a as ba from t1 a, t1 b) x;
83
ERROR 42000: The SELECT would examine more than MAX_JOIN_SIZE rows; check your WHERE and use SET SQL_BIG_SELECTS=1 or SET MAX_JOIN_SIZE=# if the SELECT is okay
84
set local max_join_size=1;
85
select * from (select 1 union select 2 union select 3) x;
86
ERROR 42000: The SELECT would examine more than MAX_JOIN_SIZE rows; check your WHERE and use SET SQL_BIG_SELECTS=1 or SET MAX_JOIN_SIZE=# if the SELECT is okay
88
SET SQL_SELECT_LIMIT=DEFAULT, MAX_JOIN_SIZE=DEFAULT;