mysql：键'PRIMARY'和奇怪的ID行为重复条目'0'

请参阅下面的日志。（为简洁起见，被剪切掉; unsnipped @http://pastebin.com/k9sCM6Ee）mysql：键'PRIMARY'和奇怪的ID行为重复条目'0'

简而言之：不知何故，行被赋予ID 0。当发生这种情况时，即使这些插入实际上没有与ID 0冲突，首先不会发生）。

虽然它被大量读取并且插入非常严重（高达〜300k行/分钟），但该表格从不更新。插入的唯一方法是导致如下所示的INSERT INTO查询的方法。没有外键或类似的东西。

a）WTF？ b）如何解决？

谢谢！

$ mysql --version 
mysql Ver 14.14 Distrib 5.1.30, for apple-darwin9.4.0 (i386) using readline 5.1 

$ mysql 

mysql> SHOW CREATE TABLE visitations \G 
*************************** 1. row *************************** 
     Table: visitations 
Create Table: CREATE TABLE `visitations` (
    `id` int(11) NOT NULL AUTO_INCREMENT, 
    `scraping_id` int(11) NOT NULL, 
    `site_id` int(11) NOT NULL, 
    `visited` tinyint(1) NOT NULL, 
    PRIMARY KEY (`id`), 
    UNIQUE KEY `index_visitations_on_scraping_id_and_site_id` (`scraping_id`,`site_id`), 
    KEY `index_visitations_on_site_id` (`site_id`) 
) ENGINE=InnoDB AUTO_INCREMENT=23525407 DEFAULT CHARSET=latin1 
1 row in set (0.00 sec) 

mysql> show triggers; 
Empty set (0.04 sec) 

mysql> INSERT INTO `visitations` (`scraping_id`,`site_id`,`visited`) VALUES (647,196,0),(647,51679,0),(647,13689,0),(647,85739,1),(647,4388,0),(647,100346,0),(647,1245,0),[snip]; 
ERROR 1062 (23000): Duplicate entry '0' for key 'PRIMARY' 

mysql> SELECT * FROM `visitations` WHERE (`scraping_id`,`site_id`,`visited`) IN ((647,196,0),(647,51679,0),(647,13689,0),(647,85739,1),(647,4388,0),(647,100346,0),(647,1245,0),[snip]); 
Empty set (1 min 27.43 sec) 

mysql> select * from visitations where id = 0; 
+----+-------------+---------+---------+ 
| id | scraping_id | site_id | visited | 
+----+-------------+---------+---------+ 
| 0 |   645 | 46177 |  0 | 
+----+-------------+---------+---------+ 
1 row in set (0.00 sec) 

mysql> delete from visitations where id < 363; 
Query OK, 363 rows affected (0.11 sec) 

mysql> select * from visitations where id = 0; 
Empty set (0.00 sec) 

mysql> INSERT INTO `visitations` (`scraping_id`,`site_id`,`visited`) VALUES (647,196,0),(647,51679,0),(647,13689,0),(647,85739,1),(647,4388,0),(647,100346,0),(647,1245,0),[snip]; 
Query OK, 500 rows affected (0.23 sec) 
Records: 500 Duplicates: 0 Warnings: 0 

mysql> select * from visitations where id = 0; 
Empty set (0.00 sec) 

mysql> INSERT INTO `visitations` (`scraping_id`,`site_id`,`visited`) VALUES (647,196,0),(647,51679,0),(647,13689,0),(647,85739,1),(647,4388,0),(647,100346,0),(647,1245,0),[snip]; 
ERROR 1062 (23000): Duplicate entry '647-196' for key 'index_visitations_on_scraping_id_and_site_id'

来源

2010-03-05 Sai