《Mysql入门innodb_index_stats导入备份数据时报错表主键冲突的解决方法》要点：
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故障描述MYSQL入门
percona5.6,mysqldump全备份,导入备份数据时报错Duplicate entry 'hoc_log99-item_log_27-PRIMARY-n_diff_pfx01' for key 'PRIMARY'MYSQL入门
故障原因MYSQL入门
查看了下这个主键应该是MySQL系统库下的系统表innodb_index_statsMYSQL入门
mysql> show create table innodb_index_stats\G
*************************** 1. row ***************************
Table: innodb_index_stats
Create Table: CREATE TABLE `innodb_index_stats` (
`database_name` varchar(64) COLLATE utf8_bin NOT NULL,
`table_name` varchar(64) COLLATE utf8_bin NOT NULL,
`index_name` varchar(64) COLLATE utf8_bin NOT NULL,
`last_update` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
`stat_name` varchar(64) COLLATE utf8_bin NOT NULL,
`stat_value` bigint(20) unsigned NOT NULL,
`sample_size` bigint(20) unsigned DEFAULT NULL,
`stat_description` varchar(1024) COLLATE utf8_bin NOT NULL,
PRIMARY KEY (`database_name`,`table_name`,`index_name`,`stat_name`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_bin STATS_PERSISTENT=0
1 row in set (0.00 sec)
mysql> select * from innodb_index_stats where database_name='hoc_log99' and table_name='item_log_27' and stat_name='n_diff_pfx01' and index_name='PRIMARY';
+---------------+-------------+------------+---------------------+--------------+------------+-------------+------------------+
| database_name | table_name | index_name | last_update | stat_name | stat_value | sample_size | stat_description |
+---------------+-------------+------------+---------------------+--------------+------------+-------------+------------------+
| hoc_log99 | item_log_27 | PRIMARY | 2016-10-07 18:44:06 | n_diff_pfx01 | 823672 | 20 | redid |
+---------------+-------------+------------+---------------------+--------------+------------+-------------+------------------+
1 row in set (0.00 sec)
再查看下我当时的备份文件sql的记录,发现再导入这个表之前是会重建表的,排除了再导入这个表之前,有item_log_27 表的操作记录进了innodb_index_stats的可能.MYSQL入门
-- Table structure for table `innodb_index_stats` DROP TABLE IF EXISTS `innodb_index_stats`; CREATE TABLE `innodb_index_stats` ( -- Dumping data for table `innodb_index_stats` LOCK TABLES `innodb_index_stats` WRITE; /*!40000 ALTER TABLE `innodb_index_stats` DISABLE KEYS */;
于是我又查看了下最近的binlog记录,发现确实有重建这个表的操作MYSQL入门
DROP TABLE IF EXISTS `innodb_index_stats` /* generated by server */ CREATE TABLE `innodb_index_stats` ( /*!40000 ALTER TABLE `innodb_index_stats` DISABLE KEYS */
结论MYSQL入门
mysql 5.6的bug,也有其他同行遇到了一样的错误MYSQL入门
https://www.percona.com/forums/questions-discussions/mysql-and-percona-server/31971-mysql-innodb_index_stats-duplication-entry-error-on-restore
MYSQL入门
https://bugs.mysql.com/bug.PHP?id=71814MYSQL入门
解决办法MYSQL入门
1 mysqldump添加参数忽略这个表的备份MYSQL入门
2 将备份文件中的这个表的insert改为replaceMYSQL入门
3 mysql -f强制导入MYSQL入门
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