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本篇內容介紹了“MySQL普通表怎么轉換成分區表”的有關知識,在實際案例的操作過程中,不少人都會遇到這樣的困境,接下來就讓小編帶領大家學習一下如何處理這些情況吧!希望大家仔細閱讀,能夠學有所成!
MySQL-5.7.32
對于業務繁忙的數據庫來說,在運行了一定時間后,往往會產生一些數據量較大的表,特別是對于每天新增數據較多的日志表或者流水表,大表對于日常的運維非常的不方便,特別是數據的清理、遷移,表的訪問性能也會隨著數據量的增大而受到影響,因此,對于大表我們需要進行優化拆分,通常拆分的方案有
所以,通常選擇分區表改造方案的主要原因都是為了避免應用層面的改造,對應用層面透明,以及方便日常的運維,前提是表具備改造分區條件。
參考文檔
MySQL官方文檔
1 根據業務的場景以及數據的分布,確認是否有匹配的分區表類型以及分區列
對于日志表,流水表這種按日期類型進行操作的,可以選擇進行range分區
對于按用戶ID類型的進行操作的,可以選擇進行hash,key分區
對于按渠道,類型的進行操作的,可以選擇進行list分區
2 應用涉及的sql,需要90%以上的操作都包含分區列,按分區操作,如果sql沒有包含分區條件,掃描全分區,性能會出現下降。
查詢表sql操作歷史
select db,query,exec_count from sys.x$statement_analysis where lower(query) like '%%'order by exec_count;
3 主鍵必須包含分區鍵
4 分區鍵表達式只支持部分函數,存儲過程,不支持二級制操作符以及/
5 分區不支持外鍵
查詢表外鍵
select * from information_schema.KEY_COLUMN_USAGE where constraint_schema ='' and REFERENCED_TABLE_SCHEMA is not null\G
6 不支持查詢緩存
7 5.7版本單個表分區最大支持8192個,并且會話第一次訪問分區表,都需要打開全部的分區表,所以避免建立過多的分區
8 數據庫最大文件打開數open_files_limit要設置足夠大以滿足表,分區的打開數量
9 數據庫大文件large_files_support設置為on
10 分區列支持null值(對于rang分區,null值總小于任何的一個非null值,即存放在最左邊的分區;對于list分區需要顯示指定null值條件),但從數據管理以及規范來看,不建議分區列存放null值,并且如果表有主鍵,則分區列不能為null值,因為分區列需要作為主鍵的一部分,不能為null
12 MySQL目前沒有自動分區功能,所以需要監控分區的使用情況,通過job自動或者定時手動添加新分區
13 確定數據保留期限,定期歸檔分區數據
以下是一張數據量為766萬的大表xxxx_user. xxxx_tab,計劃將其改造為范圍分區,按月存放。
select table_schema,table_name,table_rows,data_length/1024/1024/1024 from information_schema.tables where table_name='xxxx_tab';
表結構
CREATE TABLE `xxxx_tab` ( `ROLE_SEQ` bigint(20) NOT NULL , `PRD_ID` varchar(64) NOT NULL , `MAKE_RIGHT` varchar(1) DEFAULT '0' , `CHECK_RIGHT` varchar(1) DEFAULT '0' , `AUTH_RIGHT` varchar(1) DEFAULT '0' , `AUTH_GROUP` varchar(4) DEFAULT NULL , `RELEASE_RIGHT` varchar(1) DEFAULT '0' , `CREATE_USER_SEQ` bigint(20) DEFAULT NULL , `CREATE_DEPT_SEQ` bigint(20) DEFAULT NULL , `CREATE_TIME` datetime DEFAULT NULL , `UPDATE_USER_SEQ` bigint(20) DEFAULT NULL , `UPDATE_DEPT_SEQ` bigint(20) DEFAULT NULL , `UPDATE_TIME` datetime DEFAULT NULL , PRIMARY KEY (`PRD_ID`,`ROLE_SEQ`), KEY `xxxx_tab_IDX01` (`ROLE_SEQ`) ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4
分區列create_time日期最大值,最小值,根據這個范圍按月創建分區
select max(CREATE_TIME),min(CREATE_TIME) from xxxx_tab;
分區列null值,對于存在的null值,需要應用對null數據進行處理,并且程序上需要確保數據寫入not null
select count(*) from xxxx_tab where create_time is null;
主鍵重建添加分區列
alter table xxxx_tab drop primary key,add primary key (`PRD_ID`,`ROLE_SEQ`,`CREATE_TIME`);
由于主鍵沒有包含分區列,需要重建主鍵添加分區列,對于主鍵重建我采取的是官方的online ddl功能,這種ddl操作會造成主從延時,但是不會產生大量的binlog,對于主從實時性要求高的,可以采用第三方的在線工具pt-osc,gh-ost
表轉化為分區表
采用pt-osc在線將表轉化為分區表,對于partition by 官方是不支持online ddl的,所以需要采用第三方的在線工具
./pt-online-schema-change --user=xxx --password=xxx --charset=utf8 D=xxxx_user,t=xxxx_tab --alter "PARTITION BY RANGE COLUMNS(CREATE_TIME) (PARTITION p200001 VALUES LESS THAN ('2000-02-01 00:00:00') ENGINE = InnoDB, PARTITION p200101 VALUES LESS THAN ('2001-02-01 00:00:00') ENGINE = InnoDB, PARTITION p201707 VALUES LESS THAN ('2017-08-01 00:00:00') ENGINE = InnoDB, PARTITION p201708 VALUES LESS THAN ('2017-09-01 00:00:00') ENGINE = InnoDB, PARTITION p201709 VALUES LESS THAN ('2017-10-01 00:00:00') ENGINE = InnoDB, PARTITION p201710 VALUES LESS THAN ('2017-11-01 00:00:00') ENGINE = InnoDB, PARTITION p201711 VALUES LESS THAN ('2017-12-01 00:00:00') ENGINE = InnoDB, PARTITION p201712 VALUES LESS THAN ('2018-01-01 00:00:00') ENGINE = InnoDB, PARTITION p201801 VALUES LESS THAN ('2018-02-01 00:00:00') ENGINE = InnoDB, PARTITION p201802 VALUES LESS THAN ('2018-03-01 00:00:00') ENGINE = InnoDB, PARTITION p201803 VALUES LESS THAN ('2018-04-01 00:00:00') ENGINE = InnoDB, PARTITION p201804 VALUES LESS THAN ('2018-05-01 00:00:00') ENGINE = InnoDB, PARTITION p201805 VALUES LESS THAN ('2018-06-01 00:00:00') ENGINE = InnoDB, PARTITION p201806 VALUES LESS THAN ('2018-07-01 00:00:00') ENGINE = InnoDB, PARTITION p201807 VALUES LESS THAN ('2018-08-01 00:00:00') ENGINE = InnoDB, PARTITION p201808 VALUES LESS THAN ('2018-09-01 00:00:00') ENGINE = InnoDB, PARTITION p201809 VALUES LESS THAN ('2018-10-01 00:00:00') ENGINE = InnoDB, PARTITION p201810 VALUES LESS THAN ('2018-11-01 00:00:00') ENGINE = InnoDB, PARTITION p201811 VALUES LESS THAN ('2018-12-01 00:00:00') ENGINE = InnoDB, PARTITION p201812 VALUES LESS THAN ('2019-01-01 00:00:00') ENGINE = InnoDB, PARTITION p201901 VALUES LESS THAN ('2019-02-01 00:00:00') ENGINE = InnoDB, PARTITION p201902 VALUES LESS THAN ('2019-03-01 00:00:00') ENGINE = InnoDB, PARTITION p201903 VALUES LESS THAN ('2019-04-01 00:00:00') ENGINE = InnoDB, PARTITION p201904 VALUES LESS THAN ('2019-05-01 00:00:00') ENGINE = InnoDB, PARTITION p201905 VALUES LESS THAN ('2019-06-01 00:00:00') ENGINE = InnoDB, PARTITION p201906 VALUES LESS THAN ('2019-07-01 00:00:00') ENGINE = InnoDB, PARTITION p201907 VALUES LESS THAN ('2019-08-01 00:00:00') ENGINE = InnoDB, PARTITION p201908 VALUES LESS THAN ('2019-09-01 00:00:00') ENGINE = InnoDB, PARTITION p201909 VALUES LESS THAN ('2019-10-01 00:00:00') ENGINE = InnoDB, PARTITION p201910 VALUES LESS THAN ('2019-11-01 00:00:00') ENGINE = InnoDB, PARTITION p201911 VALUES LESS THAN ('2019-12-01 00:00:00') ENGINE = InnoDB, PARTITION p201912 VALUES LESS THAN ('2020-01-01 00:00:00') ENGINE = InnoDB, PARTITION p202001 VALUES LESS THAN ('2020-02-01 00:00:00') ENGINE = InnoDB, PARTITION p202002 VALUES LESS THAN ('2020-03-01 00:00:00') ENGINE = InnoDB, PARTITION p202003 VALUES LESS THAN ('2020-04-01 00:00:00') ENGINE = InnoDB, PARTITION p202004 VALUES LESS THAN ('2020-05-01 00:00:00') ENGINE = InnoDB, PARTITION p202005 VALUES LESS THAN ('2020-06-01 00:00:00') ENGINE = InnoDB, PARTITION p202006 VALUES LESS THAN ('2020-07-01 00:00:00') ENGINE = InnoDB, PARTITION p202007 VALUES LESS THAN ('2020-08-01 00:00:00') ENGINE = InnoDB, PARTITION p202008 VALUES LESS THAN ('2020-09-01 00:00:00') ENGINE = InnoDB, PARTITION p202009 VALUES LESS THAN ('2020-10-01 00:00:00') ENGINE = InnoDB, PARTITION p202010 VALUES LESS THAN ('2020-11-01 00:00:00') ENGINE = InnoDB, PARTITION p202011 VALUES LESS THAN ('2020-12-01 00:00:00') ENGINE = InnoDB, PARTITION p202012 VALUES LESS THAN ('2021-01-01 00:00:00') ENGINE = InnoDB, PARTITION p202101 VALUES LESS THAN ('2021-02-01 00:00:00') ENGINE = InnoDB, PARTITION p202102 VALUES LESS THAN ('2021-03-01 00:00:00') ENGINE = InnoDB, PARTITION p202103 VALUES LESS THAN ('2021-04-01 00:00:00') ENGINE = InnoDB, PARTITION p202104 VALUES LESS THAN ('2021-05-01 00:00:00') ENGINE = InnoDB, PARTITION p202105 VALUES LESS THAN ('2021-06-01 00:00:00') ENGINE = InnoDB, PARTITION p202106 VALUES LESS THAN ('2021-07-01 00:00:00') ENGINE = InnoDB, PARTITION p202107 VALUES LESS THAN ('2021-08-01 00:00:00') ENGINE = InnoDB, PARTITION p202108 VALUES LESS THAN ('2021-09-01 00:00:00') ENGINE = InnoDB, PARTITION p202109 VALUES LESS THAN ('2021-10-01 00:00:00') ENGINE = InnoDB, PARTITION p202110 VALUES LESS THAN ('2021-11-01 00:00:00') ENGINE = InnoDB, PARTITION p202111 VALUES LESS THAN ('2021-12-01 00:00:00') ENGINE = InnoDB, PARTITION p202112 VALUES LESS THAN ('2022-01-01 00:00:00') ENGINE = InnoDB, PARTITION p202201 VALUES LESS THAN ('2022-02-01 00:00:00') ENGINE = InnoDB, PARTITION p202202 VALUES LESS THAN ('2022-03-01 00:00:00') ENGINE = InnoDB, PARTITION p202203 VALUES LESS THAN ('2022-04-01 00:00:00') ENGINE = InnoDB, PARTITION p202204 VALUES LESS THAN ('2022-05-01 00:00:00') ENGINE = InnoDB, PARTITION p202205 VALUES LESS THAN ('2022-06-01 00:00:00') ENGINE = InnoDB, PARTITION p202206 VALUES LESS THAN ('2022-07-01 00:00:00') ENGINE = InnoDB, PARTITION p202207 VALUES LESS THAN ('2022-08-01 00:00:00') ENGINE = InnoDB, PARTITION p202208 VALUES LESS THAN ('2022-09-01 00:00:00') ENGINE = InnoDB, PARTITION p202209 VALUES LESS THAN ('2022-10-01 00:00:00') ENGINE = InnoDB, PARTITION p202210 VALUES LESS THAN ('2022-11-01 00:00:00') ENGINE = InnoDB, PARTITION p202211 VALUES LESS THAN ('2022-12-01 00:00:00') ENGINE = InnoDB, PARTITION p202212 VALUES LESS THAN ('2023-01-01 00:00:00') ENGINE = InnoDB, PARTITION p202301 VALUES LESS THAN ('2023-02-01 00:00:00') ENGINE = InnoDB, PARTITION p202302 VALUES LESS THAN ('2023-03-01 00:00:00') ENGINE = InnoDB, PARTITION p202303 VALUES LESS THAN ('2023-04-01 00:00:00') ENGINE = InnoDB, PARTITION p202304 VALUES LESS THAN ('2023-05-01 00:00:00') ENGINE = InnoDB, PARTITION p202305 VALUES LESS THAN ('2023-06-01 00:00:00') ENGINE = InnoDB, PARTITION p202306 VALUES LESS THAN ('2023-07-01 00:00:00') ENGINE = InnoDB, PARTITION p202307 VALUES LESS THAN ('2023-08-01 00:00:00') ENGINE = InnoDB, PARTITION p202308 VALUES LESS THAN ('2023-09-01 00:00:00') ENGINE = InnoDB, PARTITION p202309 VALUES LESS THAN ('2023-10-01 00:00:00') ENGINE = InnoDB, PARTITION p202310 VALUES LESS THAN ('2023-11-01 00:00:00') ENGINE = InnoDB, PARTITION p202311 VALUES LESS THAN ('2023-12-01 00:00:00') ENGINE = InnoDB, PARTITION p202312 VALUES LESS THAN ('2024-01-01 00:00:00') ENGINE = InnoDB, PARTITION pmax VALUES LESS THAN (MAXVALUE) ENGINE = InnoDB)" --recursion-method hosts --max-lag 600 --nodrop-old-table --print --statistics --execute
分區后表模型
CREATE TABLE `xxxx_tab` ( `ROLE_SEQ` bigint(20) NOT NULL , `PRD_ID` varchar(64) NOT NULL , `MAKE_RIGHT` varchar(1) DEFAULT '0' , `CHECK_RIGHT` varchar(1) DEFAULT '0' , `AUTH_RIGHT` varchar(1) DEFAULT '0' , `AUTH_GROUP` varchar(4) DEFAULT NULL , `RELEASE_RIGHT` varchar(1) DEFAULT '0' , `CREATE_USER_SEQ` bigint(20) DEFAULT NULL , `CREATE_DEPT_SEQ` bigint(20) DEFAULT NULL , `CREATE_TIME` datetime NOT NULL , `UPDATE_USER_SEQ` bigint(20) DEFAULT NULL , `UPDATE_DEPT_SEQ` bigint(20) DEFAULT NULL , `UPDATE_TIME` datetime DEFAULT NULL , PRIMARY KEY (`PRD_ID`,`ROLE_SEQ`,`CREATE_TIME`), KEY `xxxx_tab_IDX01` (`ROLE_SEQ`) ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 PARTITION BY RANGE COLUMNS(CREATE_TIME) (PARTITION p200001 VALUES LESS THAN ('2000-02-01 00:00:00') ENGINE = InnoDB, PARTITION p200101 VALUES LESS THAN ('2001-02-01 00:00:00') ENGINE = InnoDB, PARTITION p201707 VALUES LESS THAN ('2017-08-01 00:00:00') ENGINE = InnoDB, PARTITION p201708 VALUES LESS THAN ('2017-09-01 00:00:00') ENGINE = InnoDB, PARTITION p201709 VALUES LESS THAN ('2017-10-01 00:00:00') ENGINE = InnoDB, PARTITION p201710 VALUES LESS THAN ('2017-11-01 00:00:00') ENGINE = InnoDB, PARTITION p201711 VALUES LESS THAN ('2017-12-01 00:00:00') ENGINE = InnoDB, PARTITION p201712 VALUES LESS THAN ('2018-01-01 00:00:00') ENGINE = InnoDB, PARTITION p201801 VALUES LESS THAN ('2018-02-01 00:00:00') ENGINE = InnoDB, PARTITION p201802 VALUES LESS THAN ('2018-03-01 00:00:00') ENGINE = InnoDB, PARTITION p201803 VALUES LESS THAN ('2018-04-01 00:00:00') ENGINE = InnoDB, PARTITION p201804 VALUES LESS THAN ('2018-05-01 00:00:00') ENGINE = InnoDB, PARTITION p201805 VALUES LESS THAN ('2018-06-01 00:00:00') ENGINE = InnoDB, PARTITION p201806 VALUES LESS THAN ('2018-07-01 00:00:00') ENGINE = InnoDB, PARTITION p201807 VALUES LESS THAN ('2018-08-01 00:00:00') ENGINE = InnoDB, PARTITION p201808 VALUES LESS THAN ('2018-09-01 00:00:00') ENGINE = InnoDB, PARTITION p201809 VALUES LESS THAN ('2018-10-01 00:00:00') ENGINE = InnoDB, PARTITION p201810 VALUES LESS THAN ('2018-11-01 00:00:00') ENGINE = InnoDB, PARTITION p201811 VALUES LESS THAN ('2018-12-01 00:00:00') ENGINE = InnoDB, PARTITION p201812 VALUES LESS THAN ('2019-01-01 00:00:00') ENGINE = InnoDB, PARTITION p201901 VALUES LESS THAN ('2019-02-01 00:00:00') ENGINE = InnoDB, PARTITION p201902 VALUES LESS THAN ('2019-03-01 00:00:00') ENGINE = InnoDB, PARTITION p201903 VALUES LESS THAN ('2019-04-01 00:00:00') ENGINE = InnoDB, PARTITION p201904 VALUES LESS THAN ('2019-05-01 00:00:00') ENGINE = InnoDB, PARTITION p201905 VALUES LESS THAN ('2019-06-01 00:00:00') ENGINE = InnoDB, PARTITION p201906 VALUES LESS THAN ('2019-07-01 00:00:00') ENGINE = InnoDB, PARTITION p201907 VALUES LESS THAN ('2019-08-01 00:00:00') ENGINE = InnoDB, PARTITION p201908 VALUES LESS THAN ('2019-09-01 00:00:00') ENGINE = InnoDB, PARTITION p201909 VALUES LESS THAN ('2019-10-01 00:00:00') ENGINE = InnoDB, PARTITION p201910 VALUES LESS THAN ('2019-11-01 00:00:00') ENGINE = InnoDB, PARTITION p201911 VALUES LESS THAN ('2019-12-01 00:00:00') ENGINE = InnoDB, PARTITION p201912 VALUES LESS THAN ('2020-01-01 00:00:00') ENGINE = InnoDB, PARTITION p202001 VALUES LESS THAN ('2020-02-01 00:00:00') ENGINE = InnoDB, PARTITION p202002 VALUES LESS THAN ('2020-03-01 00:00:00') ENGINE = InnoDB, PARTITION p202003 VALUES LESS THAN ('2020-04-01 00:00:00') ENGINE = InnoDB, PARTITION p202004 VALUES LESS THAN ('2020-05-01 00:00:00') ENGINE = InnoDB, PARTITION p202005 VALUES LESS THAN ('2020-06-01 00:00:00') ENGINE = InnoDB, PARTITION p202006 VALUES LESS THAN ('2020-07-01 00:00:00') ENGINE = InnoDB, PARTITION p202007 VALUES LESS THAN ('2020-08-01 00:00:00') ENGINE = InnoDB, PARTITION p202008 VALUES LESS THAN ('2020-09-01 00:00:00') ENGINE = InnoDB, PARTITION p202009 VALUES LESS THAN ('2020-10-01 00:00:00') ENGINE = InnoDB, PARTITION p202010 VALUES LESS THAN ('2020-11-01 00:00:00') ENGINE = InnoDB, PARTITION p202011 VALUES LESS THAN ('2020-12-01 00:00:00') ENGINE = InnoDB, PARTITION p202012 VALUES LESS THAN ('2021-01-01 00:00:00') ENGINE = InnoDB, PARTITION p202101 VALUES LESS THAN ('2021-02-01 00:00:00') ENGINE = InnoDB, PARTITION p202102 VALUES LESS THAN ('2021-03-01 00:00:00') ENGINE = InnoDB, PARTITION p202103 VALUES LESS THAN ('2021-04-01 00:00:00') ENGINE = InnoDB, PARTITION p202104 VALUES LESS THAN ('2021-05-01 00:00:00') ENGINE = InnoDB, PARTITION p202105 VALUES LESS THAN ('2021-06-01 00:00:00') ENGINE = InnoDB, PARTITION p202106 VALUES LESS THAN ('2021-07-01 00:00:00') ENGINE = InnoDB, PARTITION p202107 VALUES LESS THAN ('2021-08-01 00:00:00') ENGINE = InnoDB, PARTITION p202108 VALUES LESS THAN ('2021-09-01 00:00:00') ENGINE = InnoDB, PARTITION p202109 VALUES LESS THAN ('2021-10-01 00:00:00') ENGINE = InnoDB, PARTITION p202110 VALUES LESS THAN ('2021-11-01 00:00:00') ENGINE = InnoDB, PARTITION p202111 VALUES LESS THAN ('2021-12-01 00:00:00') ENGINE = InnoDB, PARTITION p202112 VALUES LESS THAN ('2022-01-01 00:00:00') ENGINE = InnoDB, PARTITION p202201 VALUES LESS THAN ('2022-02-01 00:00:00') ENGINE = InnoDB, PARTITION p202202 VALUES LESS THAN ('2022-03-01 00:00:00') ENGINE = InnoDB, PARTITION p202203 VALUES LESS THAN ('2022-04-01 00:00:00') ENGINE = InnoDB, PARTITION p202204 VALUES LESS THAN ('2022-05-01 00:00:00') ENGINE = InnoDB, PARTITION p202205 VALUES LESS THAN ('2022-06-01 00:00:00') ENGINE = InnoDB, PARTITION p202206 VALUES LESS THAN ('2022-07-01 00:00:00') ENGINE = InnoDB, PARTITION p202207 VALUES LESS THAN ('2022-08-01 00:00:00') ENGINE = InnoDB, PARTITION p202208 VALUES LESS THAN ('2022-09-01 00:00:00') ENGINE = InnoDB, PARTITION p202209 VALUES LESS THAN ('2022-10-01 00:00:00') ENGINE = InnoDB, PARTITION p202210 VALUES LESS THAN ('2022-11-01 00:00:00') ENGINE = InnoDB, PARTITION p202211 VALUES LESS THAN ('2022-12-01 00:00:00') ENGINE = InnoDB, PARTITION p202212 VALUES LESS THAN ('2023-01-01 00:00:00') ENGINE = InnoDB, PARTITION p202301 VALUES LESS THAN ('2023-02-01 00:00:00') ENGINE = InnoDB, PARTITION p202302 VALUES LESS THAN ('2023-03-01 00:00:00') ENGINE = InnoDB, PARTITION p202303 VALUES LESS THAN ('2023-04-01 00:00:00') ENGINE = InnoDB, PARTITION p202304 VALUES LESS THAN ('2023-05-01 00:00:00') ENGINE = InnoDB, PARTITION p202305 VALUES LESS THAN ('2023-06-01 00:00:00') ENGINE = InnoDB, PARTITION p202306 VALUES LESS THAN ('2023-07-01 00:00:00') ENGINE = InnoDB, PARTITION p202307 VALUES LESS THAN ('2023-08-01 00:00:00') ENGINE = InnoDB, PARTITION p202308 VALUES LESS THAN ('2023-09-01 00:00:00') ENGINE = InnoDB, PARTITION p202309 VALUES LESS THAN ('2023-10-01 00:00:00') ENGINE = InnoDB, PARTITION p202310 VALUES LESS THAN ('2023-11-01 00:00:00') ENGINE = InnoDB, PARTITION p202311 VALUES LESS THAN ('2023-12-01 00:00:00') ENGINE = InnoDB, PARTITION p202312 VALUES LESS THAN ('2024-01-01 00:00:00') ENGINE = InnoDB, PARTITION pmax VALUES LESS THAN (MAXVALUE) ENGINE = InnoDB)
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