mysql儲存過程按月建立表分割槽 方式二

這篇文章與mysql儲存過程按月建立表分割槽 方式一 寫的是相同的內容，只是在表分割槽建立方式上不一樣。方式一是以less than(『yyyy-mm-dd』)含引號作為分割槽格式，這樣分割槽因為含有了引號，再執行sql查詢資料屬於哪個分區內時，容易產生問題；查詢sql:

select partition_name part,partition_description,partition_ordinal_position

from information_schema.partitions
where table_schema = schema() and table_name='表名'
and partition_description>='yyyy-mm-dd'。

所有就重新寫了這一種分割槽方式

#--設定mysql自動允許定時任務

setglobal event_scheduler =1;
#--建日誌表
create
table
`sys_log_storage` (
`id` bigint(32) not
null comment 'id',
`ip`
varchar(16) default
null comment '伺服器ip',
`lvl`
varchar(16) default
null comment '日誌級別',
`title`
varchar(64) default
null comment '標題',
`content`
varchar(1024) default
null,
`createtime` datetime not
null comment '建立時間',
`classname`
varchar(128) default
null,
`method`
varchar(64) default
null
) engine=innodb charset=utf8 comment='日誌儲存';
#--分割槽儲存過程
create
procedure pro_sys_logbymonth(in tablename varchar(20),in timecolname varchar(20))
comment '每月按時新增表分割槽的儲存過程，由定時任務呼叫'
begin
declare p_id int;
declare nextdate date;
declare lastdate long;
#--獲取表中的現有的分割槽數量數量
select
count(partition_name) into p_id from information_schema.partitions 
where table_schema = schema() and table_name=tablename;
if p_id=0 then
#--獲取下個月第一天的時間值，根據此值設定時間分割槽
select date_add(curdate()-day(curdate())+1,interval
1month) into nextdate from dual;
set @v_add=concat('alter table ',tablename,' partition by range(to_days(',timecolname,'))
(partition ',concat('par',p_id),' values less than (to_days(\'',nextdate,'\')))');
else
#--獲取表中現有的最大的分割槽日期
select
max(partition_description) des into lastdate from information_schema.partitions 
where table_schema = schema() and table_name=tablename;
select date_add(from_days(lastdate),interval
1month) into nextdate from dual;
set @v_add=concat('alter table ',tablename,' add partition (partition ',concat('par',p_id),
' values less than (to_days(\'',nextdate,'\')))');
endif;
prepare stmt from @v_add;
execute stmt;
deallocate prepare stmt;
end#--每月建立乙個分割槽的定時任務
create event event_syslog on schedule every 1
month starts current_timestamp
on completion preserve
enable
docall pro_sys_logbymonth('sys_log_storage','createtime');
#--新增聯合索引
alter
table sys_log_storage add
primary
key(id,createtime);
alter
table sys_log_storage change id id bigint(32) not
null auto_increment;
alter
table sys_log_storage auto_increment=1;
#--新增索引
alter
table sys_log_storage add index inx_syslog_ip(ip);
#--檢視sql執行時，查詢了那些分割槽，及使用的索引
explain partitions select * from sys_log_storage where ip='125.76.249.62'
and createtime <'2016-01-20';

-- 按日期格式自動新增分割槽儲存過程

create
procedure pro_sys_logbyweekday (in tablename varchar(20),in timecolname varchar(20),in dateformat varchar(10))
comment '按日期格式(年year，月month，周week，日day)新增表分割槽的儲存過程，由定時任務呼叫'
begin
declare p_id int;
declare lasttime long;
declare nexttime varchar(20);
-- 獲取表中現有的最大的分割槽日期
select
max(partition_ordinal_position),max(partition_description) des into p_id,lasttime from information_schema.partitions where table_schema = schema() and table_name=tablename;
-- lasttime的值是'2015-12-01' 含引號格式的字串 必須轉換成沒有引號的字串
set @v_add_a=concat('select adddate(from_days(',lasttime,'),interval 1 ',dateformat,') into @nexttime from dual ');
prepare stm from @v_add_a;
execute stm;
deallocate prepare stm;
-- 將編譯執行的stm結果儲存到lasttimeadd中
set nexttime=@nexttime;
set @v_add=concat('alter table ',tablename,' add partition (partition ',concat('par',p_id),' values less than (to_days(\'',nexttime,'\')))');
prepare stmt from @v_add;
execute stmt;
deallocate prepare stmt;
end-- 建立每週生成一次表分割槽的定時任務
create event event_syslogweek on schedule every 1
month starts current_timestamp
on completion preserve
enable
docall pro_sys_logbyweekday('sys_log_storage6','createtime','week');
-- 建立每天生成一次表分割槽的定時任務
create event event_syslogday on schedule every 1
day starts current_timestamp
on completion preserve
enable
docall pro_sys_logbyweekday('sys_log_storage6','createtime','day');

mysql 儲存過程建立多個表

要建立64個表，聽到這一需求，必然要用儲存過程。直接上 delimiter use table drop procedure if exists p create definer root localhost procedure p begin declare i int declare table...

儲存過程建立表

create or replace procedure test1 tname varchar2 is v createsql varchar2 400 v dropsql varchar2 100 v count number 9 begin v createsql create table tn...

mysql 按月分表的查詢 mysql分表 查詢

標籤 垂直分表 其實沒啥好講，就是 主鍵 常用列放在原表中，再講 主鍵 一些不常用列放在另外的表中。這樣乙個資料頁就可以存放更多資料。但是缺點也明顯，可能會增加join 或 union之類的操作。水平分表 今天面試被問到水平分表，突然愣住了，分都知道，但分完如何有效查詢就不好說了。原則 具體情況具體...