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);