1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
|
DROP TABLE IF EXISTS t1;
set @val = "0123456789ABCDEF0123456789ABCDEF0123456789ABCDEF0123456789ABCDEF0123456789ABCDEF0123456789ABCDEF0123456789ABCDEF0123456789ABCDEF0123456789ABCDEF0123456789ABCDEF";
set @val2 = 0x0123456789ABCDEF0123456789ABCDEF0123456789ABCDEF0123456789ABCDEF0123456789ABCDEF0123456789ABCDEF0123456789ABCDEF0123456789ABCDEF0123456789ABCDEF0123456789ABCDEF;
CREATE TABLE t1 (
pk INT NOT NULL PRIMARY KEY AUTO_INCREMENT,
attr1 VARCHAR(1024),
attr2 VARBINARY(1024),
attr3 TEXT
) ROW_FORMAT=DYNAMIC ENGINE=ndbcluster;
CREATE UNIQUE INDEX ui on t1(pk,attr1,attr2);
set @old_ndb_autoincrement_prefetch_sz = @@session.ndb_autoincrement_prefetch_sz;
set ndb_autoincrement_prefetch_sz = 256;
set ndb_autoincrement_prefetch_sz = @old_ndb_autoincrement_prefetch_sz;
select count(*) from t1;
count(*)
10000
flush tables;
select data_length from information_schema.tables where table_name like 't1' into @data_length0;
delete from t1 where mod(pk, 100) < 75 order by pk limit 1000;
delete from t1 where mod(pk, 100) < 75 order by pk limit 1000;
delete from t1 where mod(pk, 100) < 75 order by pk limit 1000;
delete from t1 where mod(pk, 100) < 75 order by pk limit 1000;
delete from t1 where mod(pk, 100) < 75 order by pk limit 1000;
delete from t1 where mod(pk, 100) < 75 order by pk limit 1000;
delete from t1 where mod(pk, 100) < 75 order by pk limit 1000;
delete from t1 where mod(pk, 100) < 75 order by pk limit 1000;
delete from t1 where mod(pk, 100) < 75 order by pk limit 1000;
select count(*) from t1;
count(*)
2500
select count(*) from t1 where mod(pk, 100) < 75;
count(*)
0
flush tables;
select data_length from information_schema.tables where table_name like 't1' into @data_length;
set ndb_optimization_delay = 0;
optimize table t1;
Table Op Msg_type Msg_text
test.t1 optimize status OK
flush tables;
select data_length from information_schema.tables where table_name like 't1' into @data_length2;
select 100*(@data_length-@data_length2)/@data_length into @opt_level;
select @opt_level > 30;
@opt_level > 30
1
drop table t1;
|
