mirror of
https://github.com/MariaDB/server.git
synced 2025-01-16 20:12:31 +01:00
96 lines
4.3 KiB
Text
96 lines
4.3 KiB
Text
drop table if exists t1;
|
|
SET SQL_SAFE_UPDATES=1,SQL_SELECT_LIMIT=4, MAX_JOIN_SIZE=9;
|
|
create table t1 (a int auto_increment primary key, b char(20));
|
|
insert into t1 values(1,"test");
|
|
SELECT SQL_BUFFER_RESULT * from t1;
|
|
a b
|
|
1 test
|
|
update t1 set b="a" where a=1;
|
|
delete from t1 where a=1;
|
|
insert into t1 values(1,"test"),(2,"test2");
|
|
SELECT SQL_BUFFER_RESULT * from t1;
|
|
a b
|
|
1 test
|
|
2 test2
|
|
update t1 set b="a" where a=1;
|
|
select 1 from t1,t1 as t2,t1 as t3;
|
|
1
|
|
1
|
|
1
|
|
1
|
|
1
|
|
update t1 set b="a";
|
|
ERROR HY000: You are using safe update mode and you tried to update a table without a WHERE that uses a KEY column
|
|
update t1 set b="a" where b="test";
|
|
ERROR HY000: You are using safe update mode and you tried to update a table without a WHERE that uses a KEY column
|
|
delete from t1;
|
|
ERROR HY000: You are using safe update mode and you tried to update a table without a WHERE that uses a KEY column
|
|
delete from t1 where b="test";
|
|
ERROR HY000: You are using safe update mode and you tried to update a table without a WHERE that uses a KEY column
|
|
delete from t1 where a+0=1;
|
|
ERROR HY000: You are using safe update mode and you tried to update a table without a WHERE that uses a KEY column
|
|
select 1 from t1,t1 as t2,t1 as t3,t1 as t4,t1 as t5;
|
|
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
|
|
update t1 set b="a" limit 1;
|
|
update t1 set b="a" where b="b" limit 2;
|
|
delete from t1 where b="test" limit 1;
|
|
delete from t1 where a+0=1 limit 2;
|
|
alter table t1 add key b (b);
|
|
SET MAX_JOIN_SIZE=2;
|
|
SELECT @@MAX_JOIN_SIZE, @@SQL_BIG_SELECTS;
|
|
@@MAX_JOIN_SIZE @@SQL_BIG_SELECTS
|
|
2 0
|
|
insert into t1 values (null,"a"),(null,"a"),(null,"a"),(null,"a"),(null,"a"),(null,"a"),(null,"a"),(null,"a"),(null,"a"),(null,"a");
|
|
SELECT * from t1 order by a;
|
|
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
|
|
SET SQL_BIG_SELECTS=1;
|
|
SELECT * from t1 order by a;
|
|
a b
|
|
2 test2
|
|
3 a
|
|
4 a
|
|
5 a
|
|
SET MAX_JOIN_SIZE=2;
|
|
SELECT * from t1;
|
|
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
|
|
SET MAX_JOIN_SIZE=DEFAULT;
|
|
SELECT * from t1;
|
|
a b
|
|
2 test2
|
|
3 a
|
|
4 a
|
|
5 a
|
|
analyze table t1;
|
|
Table Op Msg_type Msg_text
|
|
test.t1 analyze status Engine-independent statistics collected
|
|
test.t1 analyze status OK
|
|
insert into t1 values (null,"a"),(null,"a"),(null,"a"),(null,"a"),(null,"a"),(null,"a"),(null,"a"),(null,"a"),(null,"a"),(null,"a");
|
|
insert into t1 values (null,"b"),(null,"b"),(null,"c"),(null,"c"),(null,"d"),(null,"d"),(null,"e"),(null,"e"),(null,"a"),(null,"e");
|
|
insert into t1 values (null,"x"),(null,"x"),(null,"y"),(null,"y"),(null,"z"),(null,"z"),(null,"v"),(null,"v"),(null,"a"),(null,"v");
|
|
explain select STRAIGHT_JOIN * from t1,t1 as t2 where t1.b=t2.b;
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
1 SIMPLE t1 ALL b NULL NULL NULL 11
|
|
1 SIMPLE t2 ALL b NULL NULL NULL 11 Using where; Using join buffer (flat, BNL join)
|
|
set MAX_SEEKS_FOR_KEY=1;
|
|
explain select STRAIGHT_JOIN * from t1,t1 as t2 where t1.b=t2.b;
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
1 SIMPLE t1 ALL b NULL NULL NULL 11
|
|
1 SIMPLE t2 ALL b NULL NULL NULL 11 Using where; Using join buffer (flat, BNL join)
|
|
SET MAX_SEEKS_FOR_KEY=DEFAULT;
|
|
drop table t1;
|
|
create table t1 (a int);
|
|
insert into t1 values (1),(2),(3),(4),(5);
|
|
insert into t1 select * from t1;
|
|
insert into t1 select * from t1;
|
|
insert into t1 select * from t1;
|
|
set local max_join_size=8;
|
|
select * from (select * from t1) x;
|
|
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
|
|
set local max_join_size=1;
|
|
select * from (select a.a as aa, b.a as ba from t1 a, t1 b) x;
|
|
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
|
|
set local max_join_size=1;
|
|
select * from (select 1 union select 2 union select 3) x;
|
|
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
|
|
drop table t1;
|
|
SET SQL_SAFE_UPDATES=0,SQL_SELECT_LIMIT=DEFAULT, MAX_JOIN_SIZE=DEFAULT;
|