1
drop table if exists t1;
2
SET SQL_SAFE_UPDATES=1,SQL_SELECT_LIMIT=4, SQL_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,t1 as t2,t1 as t3;
23
ERROR HY000: You are using safe update mode and you tried to update a table without a WHERE that uses a KEY column
24
update t1 set b="a" where b="test";
25
ERROR HY000: You are using safe update mode and you tried to update a table without a WHERE that uses a KEY column
27
ERROR HY000: You are using safe update mode and you tried to update a table without a WHERE that uses a KEY column
28
delete from t1 where b="test";
29
ERROR HY000: You are using safe update mode and you tried to update a table without a WHERE that uses a KEY column
30
delete from t1 where a+0=1;
31
ERROR HY000: You are using safe update mode and you tried to update a table without a WHERE that uses a KEY column
32
select 1 from t1,t1 as t2,t1 as t3,t1 as t4,t1 as t5;
33
ERROR 42000: The SELECT would examine more than MAX_JOIN_SIZE rows; check your WHERE and use SET SQL_BIG_SELECTS=1 or SET SQL_MAX_JOIN_SIZE=# if the SELECT is okay
34
update t1 set b="a" limit 1;
35
update t1 set b="a" where b="b" limit 2;
36
delete from t1 where b="test" limit 1;
37
delete from t1 where a+0=1 limit 2;
38
alter table t1 add key b (b);
40
SELECT @@MAX_JOIN_SIZE, @@SQL_BIG_SELECTS;
41
@@MAX_JOIN_SIZE @@SQL_BIG_SELECTS
43
insert into t1 values (null,"a"),(null,"a"),(null,"a"),(null,"a"),(null,"a"),(null,"a"),(null,"a"),(null,"a"),(null,"a"),(null,"a");
44
SELECT * from t1 order by a;
45
ERROR 42000: The SELECT would examine more than MAX_JOIN_SIZE rows; check your WHERE and use SET SQL_BIG_SELECTS=1 or SET SQL_MAX_JOIN_SIZE=# if the SELECT is okay
46
SET SQL_BIG_SELECTS=1;
47
SELECT * from t1 order by a;
55
ERROR 42000: The SELECT would examine more than MAX_JOIN_SIZE rows; check your WHERE and use SET SQL_BIG_SELECTS=1 or SET SQL_MAX_JOIN_SIZE=# if the SELECT is okay
56
SET MAX_JOIN_SIZE=DEFAULT;
64
Table Op Msg_type Msg_text
65
test.t1 analyze status OK
66
insert into t1 values (null,"a"),(null,"a"),(null,"a"),(null,"a"),(null,"a"),(null,"a"),(null,"a"),(null,"a"),(null,"a"),(null,"a");
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 ALL b NULL NULL NULL 21
70
1 SIMPLE t2 ref b b 21 test.t1.b 6
71
set MAX_SEEKS_FOR_KEY=1;
72
explain select STRAIGHT_JOIN * from t1,t1 as t2 where t1.b=t2.b;
73
id select_type table type possible_keys key key_len ref rows Extra
74
1 SIMPLE t1 ALL b NULL NULL NULL 21
75
1 SIMPLE t2 ref b b 21 test.t1.b 6
76
SET MAX_SEEKS_FOR_KEY=DEFAULT;
78
create table t1 (a int);
79
insert into t1 values (1),(2),(3),(4),(5);
80
insert into t1 select * from t1;
81
insert into t1 select * from t1;
82
insert into t1 select * from t1;
83
set local max_join_size=8;
84
select * from (select * from t1) x;
85
ERROR 42000: The SELECT would examine more than MAX_JOIN_SIZE rows; check your WHERE and use SET SQL_BIG_SELECTS=1 or SET SQL_MAX_JOIN_SIZE=# if the SELECT is okay
86
set local max_join_size=1;
87
select * from (select a.a as aa, b.a as ba from t1 a, t1 b) x;
88
ERROR 42000: The SELECT would examine more than MAX_JOIN_SIZE rows; check your WHERE and use SET SQL_BIG_SELECTS=1 or SET SQL_MAX_JOIN_SIZE=# if the SELECT is okay
89
set local max_join_size=1;
90
select * from (select 1 union select 2 union select 3) x;
91
ERROR 42000: The SELECT would examine more than MAX_JOIN_SIZE rows; check your WHERE and use SET SQL_BIG_SELECTS=1 or SET SQL_MAX_JOIN_SIZE=# if the SELECT is okay
93
SET SQL_SAFE_UPDATES=0,SQL_SELECT_LIMIT=DEFAULT, SQL_MAX_JOIN_SIZE=DEFAULT;