关于MySQL的分区(partion)

 1 CREATE TABLE part_tab
(  c1 int default NULL,
c2 varchar(30) default NULL,
c3 date default NULL
) engine=myisam
PARTITION BY RANGE (year(c3)) 
(
PARTITION p0 VALUES LESS THAN (1995),
PARTITION p1 VALUES LESS THAN (1996) , 
PARTITION p2 VALUES LESS THAN (1997) ,
PARTITION p3 VALUES LESS THAN (1998) ,
PARTITION p4 VALUES LESS THAN (1999),
PARTITION p5 VALUES LESS THAN (2000) , 
PARTITION p6 VALUES LESS THAN (2001) ,
PARTITION p7 VALUES LESS THAN (2002) , 
PARTITION p8 VALUES LESS THAN (2003) ,
PARTITION p9 VALUES LESS THAN (2004) , 
PARTITION p10 VALUES LESS THAN (2010),
PARTITION p11 VALUES LESS THAN MAXVALUE 
);


create table no_part_tab
(c1 int(11) default NULL,
c2 varchar(30) default NULL,
c3 date default NULL
) engine=myisam;


delimiter //
CREATE PROCEDURE load_part_tab()
begin
declare v int default 0;
          while v < 8000000
  do
  insert into part_tab(c1,c2,c3)
  values (v,'testing partitions',adddate('1995-01-01',(rand(v)*36520) mod 3652));
  set v = v + 1;
  end while;
  end
//

delimiter ;
call load_part_tab();
explain select count(*) from no_part_tab where
c3 > date '1995-01-01' and c3 < date '1995-12-31';

explain select count(*) from part_tab where
c3 > date '1995-01-01' and c3 < date '1995-12-31';




CREATE TABLE part_tab2
(  
c1 int default NULL
) engine=myisam
PARTITION BY RANGE (c1) 
(
PARTITION p0 VALUES LESS THAN (5),
PARTITION p1 VALUES LESS THAN (10),
PARTITION p2 VALUES LESS THAN MAXVALUE
);

insert into part_tab2 values(2),(3);