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|
drop table if exists t1;
drop database if exists mysqltest;
create table t1 (
a int not null primary key,
b tinytext
) engine=ndbcluster;
insert into t1 values(1, 'x');
update t1 set b = 'y';
select * from t1;
a b
1 y
delete from t1;
drop table t1;
create table t1 (
a int not null primary key,
b text not null
) engine=ndbcluster;
insert into t1 values(1, '');
select * from t1;
a b
1
drop table t1;
set autocommit=0;
create table t1 (
a int not null primary key,
b text not null,
c int not null,
d longblob,
key (c)
) engine=ndbcluster;
set @x0 = '01234567012345670123456701234567';
set @x0 = concat(@x0,@x0,@x0,@x0,@x0,@x0,@x0,@x0);
set @b1 = 'b1';
set @b1 = concat(@b1,@b1,@b1,@b1,@b1,@b1,@b1,@b1,@b1,@b1);
set @b1 = concat(@b1,@b1,@b1,@b1,@b1,@b1,@b1,@b1,@b1,@b1);
set @b1 = concat(@b1,@b1,@b1,@b1,@b1,@b1,@b1,@b1,@b1,@b1);
set @b1 = concat(@b1,@x0);
set @d1 = 'dd1';
set @d1 = concat(@d1,@d1,@d1,@d1,@d1,@d1,@d1,@d1,@d1,@d1);
set @d1 = concat(@d1,@d1,@d1,@d1,@d1,@d1,@d1,@d1,@d1,@d1);
set @d1 = concat(@d1,@d1,@d1,@d1,@d1,@d1,@d1,@d1,@d1,@d1);
set @b2 = 'b2';
set @b2 = concat(@b2,@b2,@b2,@b2,@b2,@b2,@b2,@b2,@b2,@b2);
set @b2 = concat(@b2,@b2,@b2,@b2,@b2,@b2,@b2,@b2,@b2,@b2);
set @b2 = concat(@b2,@b2,@b2,@b2,@b2,@b2,@b2,@b2,@b2,@b2);
set @b2 = concat(@b2,@b2,@b2,@b2,@b2,@b2,@b2,@b2,@b2,@b2);
set @d2 = 'dd2';
set @d2 = concat(@d2,@d2,@d2,@d2,@d2,@d2,@d2,@d2,@d2,@d2);
set @d2 = concat(@d2,@d2,@d2,@d2,@d2,@d2,@d2,@d2,@d2,@d2);
set @d2 = concat(@d2,@d2,@d2,@d2,@d2,@d2,@d2,@d2,@d2,@d2);
set @d2 = concat(@d2,@d2,@d2,@d2,@d2,@d2,@d2,@d2,@d2,@d2);
select length(@x0),length(@b1),length(@d1) from dual;
length(@x0) length(@b1) length(@d1)
256 2256 3000
select length(@x0),length(@b2),length(@d2) from dual;
length(@x0) length(@b2) length(@d2)
256 20000 30000
insert into t1 values(1,@b1,111,@d1);
insert into t1 values(2,@b2,222,@d2);
commit;
explain select * from t1 where a = 1;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 const PRIMARY PRIMARY 4 const 1
select a,length(b),substr(b,1+2*900,2),length(d),substr(d,1+3*900,3)
from t1 where a=1;
a length(b) substr(b,1+2*900,2) length(d) substr(d,1+3*900,3)
1 2256 b1 3000 dd1
select a,length(b),substr(b,1+2*9000,2),length(d),substr(d,1+3*9000,3)
from t1 where a=2;
a length(b) substr(b,1+2*9000,2) length(d) substr(d,1+3*9000,3)
2 20000 b2 30000 dd2
update t1 set b=@b2,d=@d2 where a=1;
update t1 set b=@b1,d=@d1 where a=2;
commit;
select a,length(b),substr(b,1+2*9000,2),length(d),substr(d,1+3*9000,3)
from t1 where a=1;
a length(b) substr(b,1+2*9000,2) length(d) substr(d,1+3*9000,3)
1 20000 b2 30000 dd2
select a,length(b),substr(b,1+2*900,2),length(d),substr(d,1+3*900,3)
from t1 where a=2;
a length(b) substr(b,1+2*900,2) length(d) substr(d,1+3*900,3)
2 2256 b1 3000 dd1
update t1 set b=concat(b,b),d=concat(d,d) where a=1;
update t1 set b=concat(b,b),d=concat(d,d) where a=2;
commit;
select a,length(b),substr(b,1+4*9000,2),length(d),substr(d,1+6*9000,3)
from t1 where a=1;
a length(b) substr(b,1+4*9000,2) length(d) substr(d,1+6*9000,3)
1 40000 b2 60000 dd2
select a,length(b),substr(b,1+4*900,2),length(d),substr(d,1+6*900,3)
from t1 where a=2;
a length(b) substr(b,1+4*900,2) length(d) substr(d,1+6*900,3)
2 4512 b1 6000 dd1
update t1 set d=null where a=1;
commit;
select a from t1 where d is null;
a
1
delete from t1 where a=1;
delete from t1 where a=2;
commit;
select count(*) from t1;
count(*)
0
insert into t1 values(1,@b1,111,@d1);
insert into t1 values(2,@b2,222,@d2);
commit;
explain select * from t1 where c = 111;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ref c c 4 const 10 Using where
select a,length(b),substr(b,1+2*900,2),length(d),substr(d,1+3*900,3)
from t1 where c=111;
a length(b) substr(b,1+2*900,2) length(d) substr(d,1+3*900,3)
1 2256 b1 3000 dd1
select a,length(b),substr(b,1+2*9000,2),length(d),substr(d,1+3*9000,3)
from t1 where c=222;
a length(b) substr(b,1+2*9000,2) length(d) substr(d,1+3*9000,3)
2 20000 b2 30000 dd2
update t1 set b=@b2,d=@d2 where c=111;
update t1 set b=@b1,d=@d1 where c=222;
commit;
select a,length(b),substr(b,1+2*9000,2),length(d),substr(d,1+3*9000,3)
from t1 where c=111;
a length(b) substr(b,1+2*9000,2) length(d) substr(d,1+3*9000,3)
1 20000 b2 30000 dd2
select a,length(b),substr(b,1+2*900,2),length(d),substr(d,1+3*900,3)
from t1 where c=222;
a length(b) substr(b,1+2*900,2) length(d) substr(d,1+3*900,3)
2 2256 b1 3000 dd1
update t1 set d=null where c=111;
commit;
select a from t1 where d is null;
a
1
delete from t1 where c=111;
delete from t1 where c=222;
commit;
select count(*) from t1;
count(*)
0
insert into t1 values(1,'b1',111,'dd1');
insert into t1 values(2,'b2',222,'dd2');
insert into t1 values(3,'b3',333,'dd3');
insert into t1 values(4,'b4',444,'dd4');
insert into t1 values(5,'b5',555,'dd5');
insert into t1 values(6,'b6',666,'dd6');
insert into t1 values(7,'b7',777,'dd7');
insert into t1 values(8,'b8',888,'dd8');
insert into t1 values(9,'b9',999,'dd9');
commit;
explain select * from t1;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ALL NULL NULL NULL NULL 100
select * from t1 order by a;
a b c d
1 b1 111 dd1
2 b2 222 dd2
3 b3 333 dd3
4 b4 444 dd4
5 b5 555 dd5
6 b6 666 dd6
7 b7 777 dd7
8 b8 888 dd8
9 b9 999 dd9
update t1 set b=concat(a,'x',b),d=concat(a,'x',d);
commit;
select * from t1 order by a;
a b c d
1 1xb1 111 1xdd1
2 2xb2 222 2xdd2
3 3xb3 333 3xdd3
4 4xb4 444 4xdd4
5 5xb5 555 5xdd5
6 6xb6 666 6xdd6
7 7xb7 777 7xdd7
8 8xb8 888 8xdd8
9 9xb9 999 9xdd9
delete from t1;
commit;
select count(*) from t1;
count(*)
0
insert into t1 values(1,@b1,111,@d1);
insert into t1 values(2,@b2,222,@d2);
commit;
explain select * from t1;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ALL NULL NULL NULL NULL 100
select a,length(b),substr(b,1+2*900,2),length(d),substr(d,1+3*900,3)
from t1 order by a;
a length(b) substr(b,1+2*900,2) length(d) substr(d,1+3*900,3)
1 2256 b1 3000 dd1
2 20000 b2 30000 dd2
update t1 set b=concat(b,b),d=concat(d,d);
commit;
select a,length(b),substr(b,1+4*9000,2),length(d),substr(d,1+6*9000,3)
from t1 order by a;
a length(b) substr(b,1+4*9000,2) length(d) substr(d,1+6*9000,3)
1 4512 6000
2 40000 b2 60000 dd2
delete from t1;
commit;
select count(*) from t1;
count(*)
0
insert into t1 values(1,'b1',111,'dd1');
insert into t1 values(2,'b2',222,'dd2');
insert into t1 values(3,'b3',333,'dd3');
insert into t1 values(4,'b4',444,'dd4');
insert into t1 values(5,'b5',555,'dd5');
insert into t1 values(6,'b6',666,'dd6');
insert into t1 values(7,'b7',777,'dd7');
insert into t1 values(8,'b8',888,'dd8');
insert into t1 values(9,'b9',999,'dd9');
commit;
explain select * from t1 where c >= 100 order by a;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range c c 4 NULL 10 Using where; Using filesort
select * from t1 where c >= 100 order by a;
a b c d
1 b1 111 dd1
2 b2 222 dd2
3 b3 333 dd3
4 b4 444 dd4
5 b5 555 dd5
6 b6 666 dd6
7 b7 777 dd7
8 b8 888 dd8
9 b9 999 dd9
update t1 set b=concat(a,'x',b),d=concat(a,'x',d)
where c >= 100;
commit;
select * from t1 where c >= 100 order by a;
a b c d
1 1xb1 111 1xdd1
2 2xb2 222 2xdd2
3 3xb3 333 3xdd3
4 4xb4 444 4xdd4
5 5xb5 555 5xdd5
6 6xb6 666 6xdd6
7 7xb7 777 7xdd7
8 8xb8 888 8xdd8
9 9xb9 999 9xdd9
select * from t1 order by a;
a b c d
1 1xb1 111 1xdd1
2 2xb2 222 2xdd2
3 3xb3 333 3xdd3
4 4xb4 444 4xdd4
5 5xb5 555 5xdd5
6 6xb6 666 6xdd6
7 7xb7 777 7xdd7
8 8xb8 888 8xdd8
9 9xb9 999 9xdd9
alter table t1 add x int;
select * from t1 order by a;
a b c d x
1 1xb1 111 1xdd1 NULL
2 2xb2 222 2xdd2 NULL
3 3xb3 333 3xdd3 NULL
4 4xb4 444 4xdd4 NULL
5 5xb5 555 5xdd5 NULL
6 6xb6 666 6xdd6 NULL
7 7xb7 777 7xdd7 NULL
8 8xb8 888 8xdd8 NULL
9 9xb9 999 9xdd9 NULL
alter table t1 drop x;
select * from t1 order by a;
a b c d
1 1xb1 111 1xdd1
2 2xb2 222 2xdd2
3 3xb3 333 3xdd3
4 4xb4 444 4xdd4
5 5xb5 555 5xdd5
6 6xb6 666 6xdd6
7 7xb7 777 7xdd7
8 8xb8 888 8xdd8
9 9xb9 999 9xdd9
create database mysqltest;
use mysqltest;
CREATE TABLE t2 (
a bigint unsigned NOT NULL PRIMARY KEY,
b int unsigned not null,
c int unsigned
) engine=ndbcluster;
insert into t2 values (1,1,1),(2,2,2);
select * from test.t1,t2 where test.t1.a = t2.a order by test.t1.a;
a b c d a b c
1 1xb1 111 1xdd1 1 1 1
2 2xb2 222 2xdd2 2 2 2
drop table t2;
use test;
select * from t1 order by a;
a b c d
1 1xb1 111 1xdd1
2 2xb2 222 2xdd2
3 3xb3 333 3xdd3
4 4xb4 444 4xdd4
5 5xb5 555 5xdd5
6 6xb6 666 6xdd6
7 7xb7 777 7xdd7
8 8xb8 888 8xdd8
9 9xb9 999 9xdd9
alter table t1 add x int;
select * from t1 order by a;
a b c d x
1 1xb1 111 1xdd1 NULL
2 2xb2 222 2xdd2 NULL
3 3xb3 333 3xdd3 NULL
4 4xb4 444 4xdd4 NULL
5 5xb5 555 5xdd5 NULL
6 6xb6 666 6xdd6 NULL
7 7xb7 777 7xdd7 NULL
8 8xb8 888 8xdd8 NULL
9 9xb9 999 9xdd9 NULL
alter table t1 drop x;
select * from t1 order by a;
a b c d
1 1xb1 111 1xdd1
2 2xb2 222 2xdd2
3 3xb3 333 3xdd3
4 4xb4 444 4xdd4
5 5xb5 555 5xdd5
6 6xb6 666 6xdd6
7 7xb7 777 7xdd7
8 8xb8 888 8xdd8
9 9xb9 999 9xdd9
delete from t1 where c >= 100;
commit;
select count(*) from t1;
count(*)
0
insert into t1 values(1,@b1,111,@d1);
insert into t1 values(2,@b2,222,@d2);
commit;
explain select * from t1 where c >= 100 order by a;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range c c 4 NULL 10 Using where; Using filesort
select a,length(b),substr(b,1+2*900,2),length(d),substr(d,1+3*900,3)
from t1 where c >= 100 order by a;
a length(b) substr(b,1+2*900,2) length(d) substr(d,1+3*900,3)
1 2256 b1 3000 dd1
2 20000 b2 30000 dd2
update t1 set b=concat(b,b),d=concat(d,d);
commit;
select a,length(b),substr(b,1+4*9000,2),length(d),substr(d,1+6*9000,3)
from t1 where c >= 100 order by a;
a length(b) substr(b,1+4*9000,2) length(d) substr(d,1+6*9000,3)
1 4512 6000
2 40000 b2 60000 dd2
delete from t1 where c >= 100;
commit;
select count(*) from t1;
count(*)
0
insert into t1 values(1,@b1,111,@d1);
insert into t1 values(2,@b2,222,@d2);
select a,length(b),substr(b,1+2*900,2),length(d),substr(d,1+3*900,3)
from t1 where a = 0;
a length(b) substr(b,1+2*900,2) length(d) substr(d,1+3*900,3)
select a,length(b),substr(b,1+2*900,2),length(d),substr(d,1+3*900,3)
from t1 where a = 1;
a length(b) substr(b,1+2*900,2) length(d) substr(d,1+3*900,3)
1 2256 b1 3000 dd1
select a,length(b),substr(b,1+2*900,2),length(d),substr(d,1+3*900,3)
from t1 where a = 2;
a length(b) substr(b,1+2*900,2) length(d) substr(d,1+3*900,3)
2 20000 b2 30000 dd2
select a,length(b),substr(b,1+2*900,2),length(d),substr(d,1+3*900,3)
from t1 order by a;
a length(b) substr(b,1+2*900,2) length(d) substr(d,1+3*900,3)
1 2256 b1 3000 dd1
2 20000 b2 30000 dd2
rollback;
select count(*) from t1;
count(*)
0
drop table t1;
drop database mysqltest;
|
