＝＝先看结果＝＝
有两个结构一样的表，no_part_tab 和 part_tab，一个使用了分区，一个不使用，结果如下，
神奇的MySQL分区
。?
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mysql> select * from no_part_tab where c1 = '80000';
+-------+--------------------+------------+
| c1 | c2 | c3 |
+-------+--------------------+------------+
| 80000 | testing partitions | 1995-05-25 |
+-------+--------------------+------------+
1 row in set (1.57 sec)
mysql> select * from part_tab where c1 = '80000';
+-------+--------------------+------------+
| c1 | c2 | c3 |
+-------+--------------------+------------+
| 80000 | testing partitions | 1995-05-25 |
+-------+--------------------+------------+
1 row in set (0.02 sec)
mysql> update part_tab set c2='zhmsong' where c1 = '80000';
Query OK, 1 row affected (0.21 sec)
Rows matched: 1 Changed: 1 Warnings: 0
mysql> update no_part_tab set c2='zhmsong' where c1 = '80000';
Query OK, 1 row affected (15.55 sec)
Rows matched: 1 Changed: 1 Warnings: 0
mysql> delete from no_part_tab where c1 = '80000';
Query OK, 1 row affected (1.46 sec)
mysql> delete from part_tab where c1 = '80000';
Query OK, 1 row affected (0.02 sec)
mysql> select count(*) from no_part_tab;
+----------+
| count(*) |
+----------+
| 7999999 |
+----------+
1 row in set (0.00 sec)
mysql> select count(*) from part_tab;
+----------+
| count(*) |
+----------+
| 7999999 |
+----------+
1 row in set (0.01 sec)
mysql> select count(*) from part_tab where c1 >= '80000' and c1 <= '150000';
+----------+
| count(*) |
+----------+
| 70000 |
+----------+
1 row in set (0.05 sec)
mysql> select count(*) from no_part_tab where c1 >= '80000' and c1 <= '150000';
+----------+
| count(*) |
+----------+
| 70000 |
+----------+
1 row in set (1.89 sec)
mysql> select count(*) from no_part_tab where c2 like '%test%';
+----------+
| count(*) |
+----------+
| 7999999 |
+----------+
1 row in set (1.52 sec)
mysql> select count(*) from part_tab where c2 like '%test%';
+----------+
| count(*) |
+----------+
| 7999999 |
+----------+
1 row in set (1.59 sec)
mysql> select * from no_part_tab where c2 like '%zhmsong%' limit 10 offset 100;
+---------+---------+------------+
| c1 | c2 | c3 |
+---------+---------+------------+
| 1100100 | zhmsong | 2004-05-13 |
| 1100101 | zhmsong | 1999-05-21 |
| 1100102 | zhmsong | 2004-05-26 |
| 1100103 | zhmsong | 1999-06-03 |
| 1100104 | zhmsong | 2004-06-09 |
| 1100105 | zhmsong | 1999-06-16 |
| 1100106 | zhmsong | 2004-06-22 |
| 1100107 | zhmsong | 1999-06-30 |
| 1100108 | zhmsong | 2004-07-05 |
| 1100109 | zhmsong | 1999-07-13 |
+---------+---------+------------+
10 rows in set (0.22 sec)
mysql> select * from part_tab where c2 like '%zhmsong%' limit 10 offset 100;
+---------+---------+------------+
| c1 | c2 | c3 |
+---------+---------+------------+
| 1100100 | zhmsong | 2004-05-13 |
| 1100101 | zhmsong | 1999-05-21 |
| 1100102 | zhmsong | 2004-05-26 |
| 1100103 | zhmsong | 1999-06-03 |
| 1100104 | zhmsong | 2004-06-09 |
| 1100105 | zhmsong | 1999-06-16 |
| 1100106 | zhmsong | 2004-06-22 |
| 1100107 | zhmsong | 1999-06-30 |
| 1100108 | zhmsong | 2004-07-05 |
| 1100109 | zhmsong | 1999-07-13 |
+---------+---------+------------+
10 rows in set (0.22 sec)
＝＝ 实现＝＝
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DROP TABLE IF EXISTS part_tab;
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CREATE TABLE part_tab (
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c1 int default NULL,
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c2 varchar(30) default NULL,
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c3 date default NULL
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) engine=myisam
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PARTITION BY RANGE (c1) (
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PARTITION p1 VALUES LESS THAN (100000),
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PARTITION p2 VALUES LESS THAN (200000),
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PARTITION p3 VALUES LESS THAN (300000),
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PARTITION p4 VALUES LESS THAN (400000),
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PARTITION p5 VALUES LESS THAN (500000),
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PARTITION p6 VALUES LESS THAN (600000),
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PARTITION p7 VALUES LESS THAN (700000),
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PARTITION p8 VALUES LESS THAN (800000),
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PARTITION p9 VALUES LESS THAN (900000),
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PARTITION p10 VALUES LESS THAN (1000000),
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PARTITION p11 VALUES LESS THAN (1100000),
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PARTITION p12 VALUES LESS THAN (1200000),
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PARTITION p13 VALUES LESS THAN (1300000),
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PARTITION p14 VALUES LESS THAN (1400000),
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PARTITION p15 VALUES LESS THAN (1500000),
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PARTITION p16 VALUES LESS THAN (1600000),
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PARTITION p17 VALUES LESS THAN (1700000),
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PARTITION p18 VALUES LESS THAN (1800000),
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PARTITION p19 VALUES LESS THAN (1900000),
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PARTITION p20 VALUES LESS THAN (2000000),
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PARTITION p21 VALUES LESS THAN (2100000),
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PARTITION p22 VALUES LESS THAN (2200000),
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PARTITION p23 VALUES LESS THAN (2300000),
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PARTITION p24 VALUES LESS THAN (2400000),
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PARTITION p25 VALUES LESS THAN (2500000),
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PARTITION p26 VALUES LESS THAN (2600000),
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PARTITION p27 VALUES LESS THAN (2700000),
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PARTITION p28 VALUES LESS THAN (2800000),
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PARTITION p29 VALUES LESS THAN (2900000),
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PARTITION p30 VALUES LESS THAN (3000000),
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PARTITION p31 VALUES LESS THAN MAXVALUE
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);
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DROP TABLE IF EXISTS no_part_tab;
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create table no_part_tab (
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c1 int(11) default NULL,
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c2 varchar(30) default NULL,
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c3 date default NULL
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) engine=myisam;
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DROP PROCEDURE IF EXISTS load_part_tab;
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delimiter //
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create PROCEDURE load_part_tab()
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begin
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declare v int default 0;
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while v < 8000000
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do
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insert into part_tab values (v,'testing partitions',adddate('1995-01-01',(rand(v)*36520) mod 3652));
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set v = v + 1;
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end while;
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end
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//
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delimiter ;