cursor 与 insert ...select 对比：　　

　　cursor：安全，不会造成死锁，可以在服务运行阶段跑,比较稳定。

　　insert...select :速度快，但是可能造成死锁，相比cursor能够成倍提升，在服务停止的情况下迁移,速度快

数据迁移案例：

　　首先数据的迁移绝对不是一朝一夕能够快速迁移完成的 ，如果可以很快完成的 dump便可以搞定，没必要大费周折了。

　　既然不是一朝一夕能完成的，那么有关键的日志记录表能够良好的反应数据迁移的过程

　　迁移日志表脚本：

DROP TABLE IF EXISTS `cx_delete_log`;
CREATE TABLE `cx_delete_log` (
  `id` int(30) NOT NULL,
  `table_name` varchar(30) DEFAULT NULL,
  `start_tm` datetime DEFAULT NULL,
  `end_tm` datetime DEFAULT NULL,
  `status` int(10) DEFAULT NULL,
  `pro_create_time` datetime DEFAULT NULL,
  `pro_end_time` datetime DEFAULT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;

-- ----------------------------
-- Records of cx_delete_log
-- ----------------------------
INSERT INTO `cx_delete_log` VALUES ('1', 'cx_waybill', '2017-01-01 00:00:00', '2017-01-01 00:10:00', '1', '2017-03-21 14:06:21', null);


ALTER TABLE `cx_delete_log`
ADD INDEX `index_end_date` (`end_tm`) USING BTREE ;

　　首先迁移的增量字段确定。这里存在一个最优解，即你每分钟的数据量，与你mysql的性能，我们可以在此之间寻找到一个平衡点（cursor与insert...select并不相同），设置每次迁移多次时间段的数据，这样能，最大效率的利用我们数据库的性能。

　　我们插入了一条日志数据，有这个来控制每次数据迁移的间隔时间段，与开始时间

如：2017-01-01 00:00:00 start_tm数据迁移增量字段的开始时间，2017-01-01 00:10:00 end_tm数据增量字段迁移的结束时间，时间间隔10分钟。

状态为1代表成功，2017-03-21 14:06:21  代表执行这段时间数据迁移的执行时间，pro_end_time代表执行这段时间数据迁移的执行完毕时间时间。

存储过程：

　　存储过程分为两个部分，1.日志的写入2.迁移操作的进行

　　日志写入：

   delimiter | 
drop procedure if exists batch_move_cx_waybill_partition_by_minute;
create procedure batch_move_cx_waybill_partition_by_minute()
begin
        DECLARE proNo INTEGER;
        DECLARE startDate TIMESTAMP;
        DECLARE endDate TIMESTAMP;
        DECLARE nextDate TIMESTAMP;
        DECLARE pro_endDate TIMESTAMP;
        SET pro_endDate='2017-03-20 00:00:00';
    REPEAT
            SELECT  ID, end_tm,DATE_ADD(end_tm,INTERVAL '00:10:00' hour_second) INTO proNo,startDate ,endDate from  cx_delete_log  ORDER BY end_tm desc limit 1;
        IF  curtime()>'06:00:00' THEN
            SET  startDate =pro_endDate;
        END IF;
        IF startDate <pro_endDate THEN
            INSERT into cx_delete_log(id,table_name,start_tm,end_tm,status,pro_create_time)VALUES(proNo+1,'cx_waybill',startDate,endDate,'0',SYSDATE());
            CALL    cursor_move_cx_waybill_partition(startDate);
            update cx_delete_log  set pro_end_time =SYSDATE() , `status`=1 where  id=proNo+1;
            COMMIT;
        END IF;
            UNTIL startDate >=pro_endDate
    END REPEAT;
end  |
delimiter ;

迁移操作的进行：

　　实例为cursor，insert..select较为简单，直接带入就行，就不做示例了

   delimiter ||
drop procedure if exists cursor_move_cx_waybill_partition;
create procedure cursor_move_cx_waybill_partition(IN startDate_tmp TIMESTAMP)
begin
        DECLARE isEXist INTEGER;
        DECLARE WAYBILLNO_TMP VARCHAR(32);
        DECLARE RESOURCECODE_TMP VARCHAR(10);
        DECLARE APPOINTMENTDDELIVERYTIME_TMP TIMESTAMP;
        DECLARE APPOINTMENTDDELIVERYENDTIME_TMP TIMESTAMP;
        DECLARE EXPECTEDDELIVERYTIME_TMP TIMESTAMP;
        DECLARE ORIGINATEID_TMP VARCHAR(32);
        DECLARE DESTINATIONID_TMP VARCHAR(32);
        DECLARE WAYBILLSTATUS_TMP VARCHAR(4);
        DECLARE VERSIONNO_TMP INTEGER;
        DECLARE STATUS_TMP CHAR(1);
        DECLARE FAILSTARTUS_TMP VARCHAR(10);
        DECLARE FAILCAUSEDESC_TMP VARCHAR(500);
        DECLARE MEMBERID_TMP VARCHAR(32);
        DECLARE HIDEFLAG_TMP VARCHAR(4);
        DECLARE CREATEUSERID_TMP VARCHAR(32);
        DECLARE CREATETIME_TMP TIMESTAMP;
        DECLARE UPDATEUSERID_TMP VARCHAR(32);
        DECLARE UPDATETIME_TMP TIMESTAMP;
        DECLARE APPOINTMENTNO_TMP VARCHAR(32);
        DECLARE SOURCECITY_TMP VARCHAR(32);
        DECLARE DESTCITY_TMP VARCHAR(32);
        DECLARE SOURCECITYCODE_TMP VARCHAR(20);
        DECLARE DESTCITYCODE_TMP VARCHAR(20);
        DECLARE EMPCODE_TMP VARCHAR(10);
        DECLARE RECEMPCODE_TMP VARCHAR(10);
        DECLARE RECMEMBERID_TMP VARCHAR(32);
        DECLARE WAYBILLFEE_TMP DOUBLE(10,0);
        DECLARE MOBILE_TMP VARCHAR(20);
        DECLARE RECMOBILE_TMP VARCHAR(20);
        DECLARE RECTIME_TMP TIMESTAMP;
        DECLARE ENDTIME_TMP TIMESTAMP;
        DECLARE EXPECTMEMBERID_TMP VARCHAR(32);
        DECLARE ORIGINATE_TMP VARCHAR(500);
        DECLARE DESTINATION_TMP VARCHAR(500);
        DECLARE PAYTYPE_TMP VARCHAR(4);
        DECLARE SECRECYTYPE_TMP VARCHAR(32);
        DECLARE SEND_EVALUATE_TMP VARCHAR(10);
        DECLARE PRODUCT_TYPE_TMP VARCHAR(32);
        DECLARE SERVICES_PROD_CODE_TMP VARCHAR(200);
        DECLARE CHANGERECORD_TMP VARCHAR(32);
        DECLARE IS_ISSUED_PREFRENCE_TMP VARCHAR(10);
        DECLARE REC_EVALUATE_TMP VARCHAR(10);
        DECLARE done INTEGER;



        DECLARE bill_cursor CURSOR for SELECT  WAYBILLNO, RESOURCECODE , APPOINTMENTDDELIVERYTIME , APPOINTMENTDDELIVERYENDTIME , EXPECTEDDELIVERYTIME ,ORIGINATEID , DESTINATIONID , WAYBILLSTATUS , VERSIONNO , STATUS, FAILSTARTUS, FAILCAUSEDESC, MEMBERID, HIDEFLAG, CREATEUSERID, CREATETIME, UPDATEUSERID, UPDATETIME, APPOINTMENTNO, SOURCECITY, DESTCITY, SOURCECITYCODE, DESTCITYCODE, EMPCODE, RECEMPCODE, RECMEMBERID,WAYBILLFEE, MOBILE, RECMOBILE, RECTIME, ENDTIME, EXPECTMEMBERID, ORIGINATE, DESTINATION, PAYTYPE, SECRECYTYPE, SEND_EVALUATE, PRODUCT_TYPE, SERVICES_PROD_CODE, CHANGERECORD, IS_ISSUED_PREFRENCE, REC_EVALUATE FROM cx_waybill WHERE CREATETIME > startDate_tmp AND CREATETIME <= DATE_ADD(startDate_tmp,INTERVAL '00:10:00' hour_second);
        DECLARE CONTINUE HANDLER FOR NOT FOUND SET done = 1;
        open bill_cursor;
        loop_bill:LOOP
        IF done = 1 THEN
            LEAVE loop_bill;
        END IF;
        FETCH bill_cursor INTO WAYBILLNO_TMP, RESOURCECODE_TMP, APPOINTMENTDDELIVERYTIME_TMP, APPOINTMENTDDELIVERYENDTIME_TMP,EXPECTEDDELIVERYTIME_TMP,ORIGINATEID_TMP, DESTINATIONID_TMP, WAYBILLSTATUS_TMP, VERSIONNO_TMP, STATUS_TMP, FAILSTARTUS_TMP, FAILCAUSEDESC_TMP, MEMBERID_TMP, HIDEFLAG_TMP, CREATEUSERID_TMP, CREATETIME_TMP, UPDATEUSERID_TMP, UPDATETIME_TMP, APPOINTMENTNO_TMP, SOURCECITY_TMP, DESTCITY_TMP, SOURCECITYCODE_TMP, DESTCITYCODE_TMP, EMPCODE_TMP, RECEMPCODE_TMP, RECMEMBERID_TMP,WAYBILLFEE_TMP, MOBILE_TMP, RECMOBILE_TMP, RECTIME_TMP, ENDTIME_TMP, EXPECTMEMBERID_TMP, ORIGINATE_TMP, DESTINATION_TMP, PAYTYPE_TMP, SECRECYTYPE_TMP, SEND_EVALUATE_TMP, PRODUCT_TYPE_TMP, SERVICES_PROD_CODE_TMP, CHANGERECORD_TMP, IS_ISSUED_PREFRENCE_TMP, REC_EVALUATE_TMP;
        IF WAYBILLNO_TMP is NULL THEN
            LEAVE loop_bill;
        END IF;
        SELECT count(1) INTO isEXist from cx_waybill_partition w where w.WAYBILLNO=WAYBILLNO_TMP;
        IF isEXist >0 THEN
        LEAVE loop_bill;
        ELSE
        INSERT  INTO cx_waybill_PARTITION (WAYBILLNO, RESOURCECODE, APPOINTMENTDDELIVERYTIME, APPOINTMENTDDELIVERYENDTIME,EXPECTEDDELIVERYTIME,ORIGINATEID, DESTINATIONID, WAYBILLSTATUS, VERSIONNO, STATUS, FAILSTARTUS, FAILCAUSEDESC, MEMBERID, HIDEFLAG, CREATEUSERID, CREATETIME, UPDATEUSERID, UPDATETIME, APPOINTMENTNO, SOURCECITY, DESTCITY, SOURCECITYCODE, DESTCITYCODE, EMPCODE, RECEMPCODE, RECMEMBERID,WAYBILLFEE, MOBILE, RECMOBILE, RECTIME, ENDTIME, EXPECTMEMBERID, ORIGINATE, DESTINATION, PAYTYPE, SECRECYTYPE, SEND_EVALUATE, PRODUCT_TYPE, SERVICES_PROD_CODE, CHANGERECORD, IS_ISSUED_PREFRENCE, REC_EVALUATE)VALUES(WAYBILLNO_TMP, RESOURCECODE_TMP, APPOINTMENTDDELIVERYTIME_TMP, APPOINTMENTDDELIVERYENDTIME_TMP,EXPECTEDDELIVERYTIME_TMP,ORIGINATEID_TMP, DESTINATIONID_TMP, WAYBILLSTATUS_TMP, VERSIONNO_TMP, STATUS_TMP, FAILSTARTUS_TMP, FAILCAUSEDESC_TMP, MEMBERID_TMP, HIDEFLAG_TMP, CREATEUSERID_TMP, CREATETIME_TMP, UPDATEUSERID_TMP, UPDATETIME_TMP, APPOINTMENTNO_TMP, SOURCECITY_TMP, DESTCITY_TMP, SOURCECITYCODE_TMP, DESTCITYCODE_TMP, EMPCODE_TMP, RECEMPCODE_TMP, RECMEMBERID_TMP,WAYBILLFEE_TMP, MOBILE_TMP, RECMOBILE_TMP, RECTIME_TMP, ENDTIME_TMP, EXPECTMEMBERID_TMP, ORIGINATE_TMP, DESTINATION_TMP, PAYTYPE_TMP, SECRECYTYPE_TMP, SEND_EVALUATE_TMP, PRODUCT_TYPE_TMP, SERVICES_PROD_CODE_TMP, CHANGERECORD_TMP, IS_ISSUED_PREFRENCE_TMP, REC_EVALUATE_TMP);
        END IF;
        end Loop; 
close bill_cursor;
COMMIT; 
end  ||
delimiter ;

定时器的创建：

　　每天凌晨一点执行：

   ---轮循删除定时器
   drop event if exists waybill_move_event;
create event waybill_move_event
on schedule every 1 DAY STARTS '2017-01-17 01:00:00'
on completion preserve ENABLE
do call batch_move_cx_waybill_partition_by_minute();


alter event waybill_move_event on completion preserve enable;

其实，在中间踩过一些坑，但是很多都是百度都能解决的  。事实证明，这样的数据迁移，其速度并不慢，而且性能相对稳定，在后续的观察中，并未对数据库造成太多的压力，可看作种蚂蚁搬家。