7

我有以下表结构，其中包含实时数据：

 CREATE TABLE IF NOT EXISTS `userstatistics` (
   `user_id` int(10) unsigned NOT NULL,
   `number_logons` int(7) unsigned NOT NULL DEFAULT '0',
   `number_profileminiviews` int(7) unsigned NOT NULL DEFAULT '0',
   `number_profilefullviews` int(7) unsigned NOT NULL DEFAULT '0',
   `number_mailsreceived` int(7) unsigned NOT NULL DEFAULT '0',
   `number_interestreceived` int(7) unsigned NOT NULL DEFAULT '0',
   `number_favouratesreceived` int(7) unsigned NOT NULL DEFAULT '0',
   `number_friendshiprequestreceived` int(7) unsigned NOT NULL DEFAULT '0',
   `number_imchatrequestreceived` int(7) unsigned NOT NULL DEFAULT '0',
   `yearweek` int(6) unsigned NOT NULL DEFAULT '0',
   PRIMARY KEY (`user_id`,`yearweek`)
 ) ENGINE=InnoDB DEFAULT CHARSET=latin1;

我想将其转换为具有以下结构的分区表：

 CREATE TABLE IF NOT EXISTS `userstatistics` (
   `user_id` int(10) unsigned NOT NULL,
   `number_logons` int(7) unsigned NOT NULL DEFAULT '0',
   `number_profileminiviews` int(7) unsigned NOT NULL DEFAULT '0',
   `number_profilefullviews` int(7) unsigned NOT NULL DEFAULT '0',
   `number_mailsreceived` int(7) unsigned NOT NULL DEFAULT '0',
   `number_interestreceived` int(7) unsigned NOT NULL DEFAULT '0',
   `number_favouratesreceived` int(7) unsigned NOT NULL DEFAULT '0',
   `number_friendshiprequestreceived` int(7) unsigned NOT NULL DEFAULT '0',
   `number_imchatrequestreceived` int(7) unsigned NOT NULL DEFAULT '0',
   `yearweek` int(6) unsigned NOT NULL DEFAULT '0',
   PRIMARY KEY (`user_id`,`yearweek`)
 ) ENGINE=InnoDB DEFAULT CHARSET=latin1
 /*!50100 PARTITION BY RANGE (yearweek)
 (PARTITION userstats_201108 VALUES LESS THAN (201108) ENGINE = InnoDB,
  PARTITION userstats_201109 VALUES LESS THAN (201109) ENGINE = InnoDB,
  PARTITION userstats_201110 VALUES LESS THAN (201110) ENGINE = InnoDB,
  PARTITION userstats_201111 VALUES LESS THAN (201111) ENGINE = InnoDB,
  PARTITION userstats_201112 VALUES LESS THAN (201112) ENGINE = InnoDB,
  PARTITION userstats_201113 VALUES LESS THAN (201113) ENGINE = InnoDB,
  PARTITION userstats_201114 VALUES LESS THAN (201114) ENGINE = InnoDB,
  PARTITION userstats_201115 VALUES LESS THAN (201115) ENGINE = InnoDB,
  PARTITION userstats_201116 VALUES LESS THAN (201116) ENGINE = InnoDB,
  PARTITION userstats_201117 VALUES LESS THAN (201117) ENGINE = InnoDB,
  PARTITION userstats_201118 VALUES LESS THAN (201118) ENGINE = InnoDB,
  PARTITION userstats_201119 VALUES LESS THAN (201119) ENGINE = InnoDB,
  PARTITION userstats_201120 VALUES LESS THAN (201120) ENGINE = InnoDB,
  PARTITION userstats_201121 VALUES LESS THAN (201121) ENGINE = InnoDB,
  PARTITION userstats_max VALUES LESS THAN MAXVALUE ENGINE = InnoDB) */;

我该如何进行这种转换？

只需将第二条 SQL 语句的第一行更改为

 ALTER TABLE 'userstatistics' (

这会做吗？

从 MySQL 5.0 到 5.1。

4

2 回答 2

8

首先，您需要运行 MySQL 5.1 或更高版本。MySQL 5.0 不支持分区。

其次，请注意单引号（分隔字符串和日期）和反引号（分隔 MySQL 中的表和列标识符）之间的区别。在适当的地方使用正确的类型。我提到这一点，因为您的示例使用了错误的引号类型：

ALTER TABLE 'userstatistics' (

那应该是：

ALTER TABLE `userstatistics` (

最后，是的，您可以使用 ALTER TABLE 将表重组为分区。这是我在 MySQL 5.1.57 上测试的语句的精确复制和粘贴：

ALTER TABLE userstatistics PARTITION BY RANGE (yearweek)  (
PARTITION userstats_201108 VALUES LESS THAN (201108) ENGINE = InnoDB,   
PARTITION userstats_201109 VALUES LESS THAN (201109) ENGINE = InnoDB,   
PARTITION userstats_201110 VALUES LESS THAN (201110) ENGINE = InnoDB,   
PARTITION userstats_201111 VALUES LESS THAN (201111) ENGINE = InnoDB,   
PARTITION userstats_201112 VALUES LESS THAN (201112) ENGINE = InnoDB,   
PARTITION userstats_201113 VALUES LESS THAN (201113) ENGINE = InnoDB,   
PARTITION userstats_201114 VALUES LESS THAN (201114) ENGINE = InnoDB,   
PARTITION userstats_201115 VALUES LESS THAN (201115) ENGINE = InnoDB,   
PARTITION userstats_201116 VALUES LESS THAN (201116) ENGINE = InnoDB,   
PARTITION userstats_201117 VALUES LESS THAN (201117) ENGINE = InnoDB,   
PARTITION userstats_201118 VALUES LESS THAN (201118) ENGINE = InnoDB,   
PARTITION userstats_201119 VALUES LESS THAN (201119) ENGINE = InnoDB,   
PARTITION userstats_201120 VALUES LESS THAN (201120) ENGINE = InnoDB,   
PARTITION userstats_201121 VALUES LESS THAN (201121) ENGINE = InnoDB, 
PARTITION userstats_max VALUES LESS THAN MAXVALUE ENGINE = InnoDB);

请注意，这会导致表重组，因此如果您在此表中已经有很多数据，则需要一段时间才能运行。确切的时间取决于您拥有多少数据，以及您的硬件速度和其他因素。请注意，在重组表时，它被锁定并且无法被其他查询读取和写入。

于 2011-08-20T00:50:48.480 回答
0

查看 有关更改表的http://dev.mysql.com/doc/refman/5.1/en/alter-table.html 。

然后特别是alter table。

ADD/DROP/COALESCE/REORGANIZE 分区 sql 提供了几乎所有的功能来管理你的分区。

请注意，哈希只能用于整数。

ALTER TABLE ... ADD PARTITION 不会创建临时表，除非与 NDB 表一起使用。RANGE 或 LIST 分区的 ADD 或 DROP 操作是立即操作或几乎是立即操作。HASH 或 KEY 分区的 ADD 或 COALESCE 操作在更改的分区之间复制数据；除非使用 LINEAR HASH 或 LINEAR KEY，否则这与创建新表非常相似（尽管操作是逐个分区完成的）。REORGANIZE 操作仅复制更改的分区，不触及未更改的分区。

于 2011-08-20T00:10:44.123 回答