批量动态新增分区表

Posted 2020-10-21 jusalun

mysql分区表人为添加不可控性太大，如果出现人员变动交接不利，或者遗忘，会导致业务数据丢失或写入失败，同时如果使用分区表较多，逐个添加分区也是挺麻烦的

推荐使用存储过程+event自动添加，同时需要留足作业时间间隔，以防万一出翔没有补救的时间，我设置的是每月初自动生成下月分区，由于我设计的分区表均为range分区按to_days设置，如果有不同需求，可以在游标内添加条件筛选，或者直接写表名过滤

 1 CREATE  PROCEDURE `sp_add_table_partition`(in p_startdate date,in p_enddate date,out p_status int)
 2 BEGIN
 3 DECLARE v_startdate int DEFAULT 0;
 4 DECLARE v_enddate int DEFAULT 0;
 5 DECLARE v_maxpart int DEFAULT 0;
 6 DECLARE v_table varchar(50);
 7 DECLARE v_cnt int DEFAULT 0;
 8 DECLARE done int DEFAULT 0;
 9 DECLARE v_cursor CURSOR FOR
10 (
11 select TABLE_NAME,max(REPLACE(partition_name,‘p‘,‘‘)) FROM INFORMATION_SCHEMA.PARTITIONS 
12 where PARTITION_NAME is not null
13 group by TABLE_NAME
14 );
15 DECLARE CONTINUE HANDLER FOR NOT FOUND SET done = 1;
16 DECLARE EXIT HANDLER FOR SQLEXCEPTION
17 begin
18     ROLLBACK;
19     set autocommit=1;
20         set p_status=0;
21 show errors;
22 end;
23 set autocommit=0;
24 
25 label_a:BEGIN
26 SET v_startdate=TO_DAYS(p_startdate);
27 SET v_enddate=TO_DAYS(p_enddate);
28 
29 OPEN v_cursor;
30 f_loop:LOOP
31 FETCH v_cursor INTO v_table,v_maxpart; 
32 
33 IF done THEN
34    LEAVE f_loop;
35 END IF;
36 
37 if v_startdate>=v_enddate then 
38 set p_status=2;
39 LEAVE label_a;
40 end if;
41 
42 if v_startdate<=TO_DAYS(v_maxpart) then 
43 set p_status=3;
44 LEAVE label_a;
45 end if;
46 
47 if v_enddate<=TO_DAYS(v_maxpart) then 
48 set p_status=4;
49 LEAVE label_a;
50 end if;
51 
52 set v_cnt=v_enddate-TO_DAYS(v_maxpart);
53 
54 set @i=1;
55     WHILE @i<v_cnt do
56 
57         SET @Max_date= DATE(DATE_ADD(v_maxpart+0, INTERVAL @i DAY))+0;
58 
59         SET @sql_1=CONCAT(‘ALTER TABLE ‘,v_table,‘ ADD PARTITION (PARTITION p‘,@Max_date,‘ VALUES LESS THAN (TO_DAYS (‘‘‘,@Max_date,‘‘‘)))‘);
60 
61         PREPARE stmt2 FROM @sql_1;
62         EXECUTE stmt2;
63         DEALLOCATE PREPARE stmt2;
64 
65         SET @i=@i+1;
66         set p_status=1;
67     END WHILE;
68 
69 end LOOP f_loop;
70 
71 CLOSE v_cursor;
72 
73 END;
74 COMMIT;
75 set autocommit=1;
76 
77 
78 END

1 CREATE DEFINER=`odao_yunwei1`@`%` EVENT `event_add_table_partition` ON SCHEDULE EVERY 1 MONTH STARTS ‘2018-01-01 00:00:00‘ ON COMPLETION PRESERVE ENABLE DO call sp_add_table_partition(DATE_ADD(DATE(NOW()),INTERVAL 1 MONTH),DATE_ADD(DATE(NOW()),INTERVAL 2 MONTH),@a)