mysql merge 分區

1.插入測試數據

1.usera 插入500w數據
2.userb 插入500w數據
3.userall (主表)

•     usert1 (子表) 插入250w數據
•     usert2 (子表) 插入250w數據

4.userall2 (主表)

•     usert3 (子表) 插入250w數據
•     usert4 (子表) 插入250w數據

---

• 建表語句

CREATE TABLE usertb(
    id serial,
    uname  varchar(20) ,
    ucreatetime  datetime  ,
    age int(11))
ENGINE=MYISAM
DEFAULT CHARACTER SET=utf8 COLLATE=utf8_general_ci
AUTO_INCREMENT=1
ROW_FORMAT=COMPACT;

CREATE TABLE usertall(
    id serial,
    uname  varchar(20) ,
    ucreatetime  datetime  ,
    age int(11))
ENGINE=MERGE union(usert1,usert2) insert_method=last
DEFAULT CHARACTER SET=utf8 COLLATE=utf8_general_ci
AUTO_INCREMENT=1
ROW_FORMAT=COMPACT;

• 使用存儲過程插入測試數據

delimiter $$
SET AUTOCOMMIT = 0$$
create  procedure test1()
begin
declare v_cnt decimal (10)  default 0 ;
dd:loop
        insert into userta values
        (null,'用戶1',now(),20),
        (null,'用戶2',now(),20),
        (null,'用戶3',now(),20),
        (null,'用戶4',now(),20),
        (null,'用戶5',now(),20),
        (null,'用戶6',now(),20),
        (null,'用戶7',now(),20),
        (null,'用戶8',now(),20),
        (null,'用戶9',now(),20),
        (null,'用戶0',now(),20);
        commit;
        set v_cnt = v_cnt+10 ;
            if  v_cnt = 5000000 then leave dd;
            end if;
        end loop dd ;
end;$$
delimiter;

• 調用存儲過程

call test1;

• 測試查詢時間

select * from userta;       --3.63s

注意點

1.分表必須保證主表和子表表結構一致，不然報錯 Error Code : 1168 Unable to open underlying table which is differently defined or of non-MyISAM type or doesn't exist