Question

我正在使用InnoDB设计论坛数据库，并且提出了一些问题，有没有人可以帮我澄清一下？

帖子和评论下面的表格设计

CREATE TABLE `my_posts` (
  `forum_id` mediumint(8) unsigned NOT NULL,
  `post_id` int(10) unsigned NOT NULL,          // not an auto increment
   subject   varchar(200) NOT NULL,
  `details` text NOT NULL,
  `access` tinyint(3) unsigned NOT NULL,  //private,friends,public
  `created_by` int(10) unsigned NOT NULL,
  `created_on` int(10) unsigned NOT NULL,
  `updated_on` int(10) unsigned NOT NULL,
  `comment_count` smallint(5) unsigned NOT NULL DEFAULT '0',
  `ip_address` int(10) unsigned NOT NULL,
   sphinx_unique_id  int(10) unsigned NOT NULL,  // not an auto increment
   PRIMARY KEY (`forum_id`,`post_id`,created_by)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

CREATE TABLE `my_posts_comments` (
  `forum_id` mediumint(8) unsigned NOT NULL,
  `post_id` int(10) unsigned NOT NULL,          // not an auto increment 
  `comment_id` int(10) unsigned NOT NULL,
  `details` text NOT NULL,
  `created_by` int(10) unsigned NOT NULL,
  `created_on` int(10) unsigned NOT NULL,
  `ip_address` int(10) unsigned NOT NULL,
  PRIMARY KEY (`forum_id`,`post_id`,comment_id)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

我根据 forum_id，post_id，created_by 进行查询，并对 updated_on，comment_count

进行排序

SELECT * FROM my_posts  WHERE access=public ORDER BY updated_on DESC      //OR ASC
SELECT * FROM my_posts  WHERE access=public ORDER BY comment_count DESC      //OR ASC
SELECT * FROM my_posts WHERE forum_id=?  and access=public ORDER BY updated_on DESC      //OR ASC
SELECT * FROM my_posts WHERE forum_id=?  and access=public  ORDER BY comment_count DESC   //OR ASC
SELECT * FROM my_posts WHERE created_by=?  ORDER BY updated_on DESC     //OR ASC
SELECT * FROM my_posts  WHERE created_by=(Friends_ids) AND access=(public,friends)   ORDER BY updated_on DESC      //OR ASC 
SELECT * FROM my_posts WHERE forum_id=? AND  post_id=?  
SELECT * FROM my_posts_comments WHERE forum_id=? AND post_id=?

1）由于 forum_id，post_id，created_by 上的复合主键，我发现访问它的问题只是在 created_by 上进行调整。在 created_by 上查询的最佳设计是什么？我可以从复合键中删除 created_by ，只需为其添加索引即可。我将在这里放松群集性能..

2）在论坛级别增加post_id的最佳方法是什么？或者我可以在表级递增。例如

示例数据（论坛级别）

 FORUM_ID  POST_ID
    1         1
    1         2
    1         3
    1         4
    2         1
    2         2
    2         3
    2         4
    2         5

或表级

 FORUM_ID  POST_ID
1          1
1          2
1          3
1          4
2          5
2          6
2          7
2          8
2          9

如果我可以使用上面的表级增量，我可以删除sphinx_unique_id列，因为我只使用它进行sphinx搜索。同样在评论表中，我可以删除forum_id列。

3）我在 updated_on 和 comment_count 上排序的所有查询。这两个不是PK，所以前两个查询看起来像一个主要问题..

感谢大家的帮助

InnoDB论坛数据库设计和复合主键（Cluster Primary Key）

0 个答案: