WordPress之MySql数据恢复

前几天与ξLAZYζQQ聊天的时候告知我网站出问题了,我登录之后才发现确实出问题了,竟然提示安装界面,估计是数据库出问题或者网站文件的配置出问题了。

前天(20170706)终于空下来可以搞这个事情了,发现问题比较严重,通过查看文件wp_config.php,里面的数据库连接什么的配置都是对的,然后通过phpmyadmin看了下表都在啊,然后select 一把查一下,严重了,提示表不存在(Table wp_posts dosn't exist!),但是我明明可以看到表名啊。

查了下上次备份是16年12月份,我17年还做过把所有的文章的链接换成了静态的,搞了好几天呢,如果恢复那岂不是要Over,但是网上查了很多方法,都没解决,包括查询区分大小写(改配置文件)、数据库迁移文件拷贝少了。尝试通过重新导入备份的方式,还是提示表不存在,连创建都不让了。

后来实在是研究不出来是怎么回事,找了我们这边DBA同事,帮我研究了一下终于搞出办法了。

问题现象:

wordpress的所有表查询都提示表不存在(Table XXXX dosn't exist!)。查看数据库ibd(数据文件)和frm(表结构文件)文件都存在。

修复条件:需要可以直接操作linux的数据文件ibd和frm的权限。(我和温柔哥有关系,所以有root权限)

修复方法:

1. 备份所有文件,以防恢复失败。

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cd /var/lib/mysql/laycher
tar zcvf laycher_2017075.tar.gz *
 
mv wp_commentmeta.ibd wp_commentmeta.ibd_bak
mv wp_comments.ibd wp_comments.ibd_bak
mv wp_links.ibd wp_links.ibd_bak
mv wp_options.ibd wp_options.ibd_bak
mv wp_postmeta.ibd wp_postmeta.ibd_bak
mv wp_posts.ibd wp_posts.ibd_bak
mv wp_term_relationships.ibd wp_term_relationships.ibd_bak
mv wp_term_taxonomy.ibd wp_term_taxonomy.ibd_bak
mv wp_termmeta.ibd wp_termmeta.ibd_bak
mv wp_terms.ibd wp_terms.ibd_bak
mv wp_usermeta.ibd wp_usermeta.ibd_bak
mv wp_users.ibd wp_users.ibd_bak

2. 删除表(DROP TABLE)

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DROP TABLE `wp_commentmeta`;
DROP TABLE `wp_comments`;
DROP TABLE `wp_links`;
DROP TABLE `wp_options`;
DROP TABLE `wp_postmeta`;
DROP TABLE `wp_posts`;
DROP TABLE `wp_term_relationships`;
DROP TABLE `wp_term_taxonomy`;
DROP TABLE `wp_termmeta`;
DROP TABLE `wp_terms`;
DROP TABLE `wp_usermeta`;
DROP TABLE `wp_users`;

如果出现提示:错误代码: 1051 UNKNOWN TABLE 'laycher.wp_termmeta',属于正常现象。

只要查看数据文件frm后缀的都没有,只剩下ibd的就可以了。

3. 创建表空间(CREATE TABLE)

从以前备份的sql中,将创建表空间的拎出来。否则可能出现字符集编码不对,导致恢复过来的数据是乱码。

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DROP TABLE IF EXISTS `wp_commentmeta`;
/*!40101 SET @saved_cs_client     = @@character_set_client */;
/*!40101 SET character_set_client = utf8 */;
CREATE TABLE `wp_commentmeta` (
  `meta_id` bigint(20) unsigned NOT NULL AUTO_INCREMENT,
  `comment_id` bigint(20) unsigned NOT NULL DEFAULT '0',
  `meta_key` varchar(255) DEFAULT NULL,
  `meta_value` longtext,
  PRIMARY KEY (`meta_id`),
  KEY `comment_id` (`comment_id`),
  KEY `meta_key` (`meta_key`(191))
) ENGINE=InnoDB AUTO_INCREMENT=424816 DEFAULT CHARSET=utf8;
/*!40101 SET character_set_client = @saved_cs_client */;
 
DROP TABLE IF EXISTS `wp_comments`;
/*!40101 SET @saved_cs_client     = @@character_set_client */;
/*!40101 SET character_set_client = utf8 */;
CREATE TABLE `wp_comments` (
  `comment_ID` bigint(20) unsigned NOT NULL AUTO_INCREMENT,
  `comment_post_ID` bigint(20) unsigned NOT NULL DEFAULT '0',
  `comment_author` tinytext NOT NULL,
  `comment_author_email` varchar(100) NOT NULL DEFAULT '',
  `comment_author_url` varchar(200) NOT NULL DEFAULT '',
  `comment_author_IP` varchar(100) NOT NULL DEFAULT '',
  `comment_date` datetime NOT NULL DEFAULT '0000-00-00 00:00:00',
  `comment_date_gmt` datetime NOT NULL DEFAULT '0000-00-00 00:00:00',
  `comment_content` text NOT NULL,
  `comment_karma` int(11) NOT NULL DEFAULT '0',
  `comment_approved` varchar(20) NOT NULL DEFAULT '1',
  `comment_agent` varchar(255) NOT NULL DEFAULT '',
  `comment_type` varchar(20) NOT NULL DEFAULT '',
  `comment_parent` bigint(20) unsigned NOT NULL DEFAULT '0',
  `user_id` bigint(20) unsigned NOT NULL DEFAULT '0',
  `comment_reply_ID` int(11) NOT NULL DEFAULT '0',
  `comment_mail_notify` tinyint(4) NOT NULL DEFAULT '0',
  PRIMARY KEY (`comment_ID`),
  KEY `comment_post_ID` (`comment_post_ID`),
  KEY `comment_approved_date_gmt` (`comment_approved`,`comment_date_gmt`),
  KEY `comment_date_gmt` (`comment_date_gmt`),
  KEY `comment_parent` (`comment_parent`),
  KEY `comment_author_email` (`comment_author_email`(10))
) ENGINE=InnoDB AUTO_INCREMENT=130099 DEFAULT CHARSET=utf8;
/*!40101 SET character_set_client = @saved_cs_client */;
 
DROP TABLE IF EXISTS `wp_links`;
/*!40101 SET @saved_cs_client     = @@character_set_client */;
/*!40101 SET character_set_client = utf8 */;
CREATE TABLE `wp_links` (
  `link_id` bigint(20) unsigned NOT NULL AUTO_INCREMENT,
  `link_url` varchar(255) NOT NULL DEFAULT '',
  `link_name` varchar(255) NOT NULL DEFAULT '',
  `link_image` varchar(255) NOT NULL DEFAULT '',
  `link_target` varchar(25) NOT NULL DEFAULT '',
  `link_description` varchar(255) NOT NULL DEFAULT '',
  `link_visible` varchar(20) NOT NULL DEFAULT 'Y',
  `link_owner` bigint(20) unsigned NOT NULL DEFAULT '1',
  `link_rating` int(11) NOT NULL DEFAULT '0',
  `link_updated` datetime NOT NULL DEFAULT '0000-00-00 00:00:00',
  `link_rel` varchar(255) NOT NULL DEFAULT '',
  `link_notes` mediumtext NOT NULL,
  `link_rss` varchar(255) NOT NULL DEFAULT '',
  PRIMARY KEY (`link_id`),
  KEY `link_visible` (`link_visible`)
) ENGINE=InnoDB AUTO_INCREMENT=13 DEFAULT CHARSET=utf8;
/*!40101 SET character_set_client = @saved_cs_client */;
 
DROP TABLE IF EXISTS `wp_options`;
/*!40101 SET @saved_cs_client     = @@character_set_client */;
/*!40101 SET character_set_client = utf8 */;
CREATE TABLE `wp_options` (
  `option_id` bigint(20) unsigned NOT NULL AUTO_INCREMENT,
  `option_name` varchar(191) DEFAULT NULL,
  `option_value` longtext NOT NULL,
  `autoload` varchar(20) NOT NULL DEFAULT 'yes',
  PRIMARY KEY (`option_id`),
  UNIQUE KEY `option_name` (`option_name`)
) ENGINE=InnoDB AUTO_INCREMENT=690978 DEFAULT CHARSET=utf8;
/*!40101 SET character_set_client = @saved_cs_client */;
 
DROP TABLE IF EXISTS `wp_postmeta`;
/*!40101 SET @saved_cs_client     = @@character_set_client */;
/*!40101 SET character_set_client = utf8 */;
CREATE TABLE `wp_postmeta` (
  `meta_id` bigint(20) unsigned NOT NULL AUTO_INCREMENT,
  `post_id` bigint(20) unsigned NOT NULL DEFAULT '0',
  `meta_key` varchar(255) DEFAULT NULL,
  `meta_value` longtext,
  PRIMARY KEY (`meta_id`),
  KEY `post_id` (`post_id`),
  KEY `meta_key` (`meta_key`(191))
) ENGINE=InnoDB AUTO_INCREMENT=1507 DEFAULT CHARSET=utf8;
/*!40101 SET character_set_client = @saved_cs_client */;
 
DROP TABLE IF EXISTS `wp_posts`;
/*!40101 SET @saved_cs_client     = @@character_set_client */;
/*!40101 SET character_set_client = utf8 */;
CREATE TABLE `wp_posts` (
  `ID` bigint(20) unsigned NOT NULL AUTO_INCREMENT,
  `post_author` bigint(20) unsigned NOT NULL DEFAULT '0',
  `post_date` datetime NOT NULL DEFAULT '0000-00-00 00:00:00',
  `post_date_gmt` datetime NOT NULL DEFAULT '0000-00-00 00:00:00',
  `post_content` longtext NOT NULL,
  `post_title` text NOT NULL,
  `post_excerpt` text NOT NULL,
  `post_status` varchar(20) NOT NULL DEFAULT 'publish',
  `comment_status` varchar(20) NOT NULL DEFAULT 'open',
  `ping_status` varchar(20) NOT NULL DEFAULT 'open',
  `post_password` varchar(20) NOT NULL DEFAULT '',
  `post_name` varchar(200) NOT NULL DEFAULT '',
  `to_ping` text NOT NULL,
  `pinged` text NOT NULL,
  `post_modified` datetime NOT NULL DEFAULT '0000-00-00 00:00:00',
  `post_modified_gmt` datetime NOT NULL DEFAULT '0000-00-00 00:00:00',
  `post_content_filtered` longtext NOT NULL,
  `post_parent` bigint(20) unsigned NOT NULL DEFAULT '0',
  `guid` varchar(255) NOT NULL DEFAULT '',
  `menu_order` int(11) NOT NULL DEFAULT '0',
  `post_type` varchar(20) NOT NULL DEFAULT 'post',
  `post_mime_type` varchar(100) NOT NULL DEFAULT '',
  `comment_count` bigint(20) NOT NULL DEFAULT '0',
  PRIMARY KEY (`ID`),
  KEY `type_status_date` (`post_type`,`post_status`,`post_date`,`ID`),
  KEY `post_parent` (`post_parent`),
  KEY `post_author` (`post_author`),
  KEY `post_name` (`post_name`(191))
) ENGINE=InnoDB AUTO_INCREMENT=1263 DEFAULT CHARSET=utf8;
/*!40101 SET character_set_client = @saved_cs_client */;
 
DROP TABLE IF EXISTS `wp_term_relationships`;
/*!40101 SET @saved_cs_client     = @@character_set_client */;
/*!40101 SET character_set_client = utf8 */;
CREATE TABLE `wp_term_relationships` (
  `object_id` bigint(20) unsigned NOT NULL DEFAULT '0',
  `term_taxonomy_id` bigint(20) unsigned NOT NULL DEFAULT '0',
  `term_order` int(11) NOT NULL DEFAULT '0',
  PRIMARY KEY (`object_id`,`term_taxonomy_id`),
  KEY `term_taxonomy_id` (`term_taxonomy_id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
/*!40101 SET character_set_client = @saved_cs_client */;
 
DROP TABLE IF EXISTS `wp_term_taxonomy`;
/*!40101 SET @saved_cs_client     = @@character_set_client */;
/*!40101 SET character_set_client = utf8 */;
CREATE TABLE `wp_term_taxonomy` (
  `term_taxonomy_id` bigint(20) unsigned NOT NULL AUTO_INCREMENT,
  `term_id` bigint(20) unsigned NOT NULL DEFAULT '0',
  `taxonomy` varchar(32) NOT NULL DEFAULT '',
  `description` longtext NOT NULL,
  `parent` bigint(20) unsigned NOT NULL DEFAULT '0',
  `count` bigint(20) NOT NULL DEFAULT '0',
  PRIMARY KEY (`term_taxonomy_id`),
  UNIQUE KEY `term_id_taxonomy` (`term_id`,`taxonomy`),
  KEY `taxonomy` (`taxonomy`)
) ENGINE=InnoDB AUTO_INCREMENT=140 DEFAULT CHARSET=utf8;
/*!40101 SET character_set_client = @saved_cs_client */;
 
DROP TABLE IF EXISTS `wp_termmeta`;
/*!40101 SET @saved_cs_client     = @@character_set_client */;
/*!40101 SET character_set_client = utf8 */;
CREATE TABLE `wp_termmeta` (
  `meta_id` bigint(20) unsigned NOT NULL AUTO_INCREMENT,
  `term_id` bigint(20) unsigned NOT NULL DEFAULT '0',
  `meta_key` varchar(255) COLLATE utf8mb4_unicode_ci DEFAULT NULL,
  `meta_value` longtext COLLATE utf8mb4_unicode_ci,
  PRIMARY KEY (`meta_id`),
  KEY `term_id` (`term_id`),
  KEY `meta_key` (`meta_key`(191))
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;
/*!40101 SET character_set_client = @saved_cs_client */;
 
DROP TABLE IF EXISTS `wp_terms`;
/*!40101 SET @saved_cs_client     = @@character_set_client */;
/*!40101 SET character_set_client = utf8 */;
CREATE TABLE `wp_terms` (
  `term_id` bigint(20) unsigned NOT NULL AUTO_INCREMENT,
  `name` varchar(200) NOT NULL DEFAULT '',
  `slug` varchar(200) NOT NULL DEFAULT '',
  `term_group` bigint(10) NOT NULL DEFAULT '0',
  PRIMARY KEY (`term_id`),
  KEY `slug` (`slug`(191)),
  KEY `name` (`name`(191))
) ENGINE=InnoDB AUTO_INCREMENT=140 DEFAULT CHARSET=utf8;
/*!40101 SET character_set_client = @saved_cs_client */;
 
DROP TABLE IF EXISTS `wp_usermeta`;
/*!40101 SET @saved_cs_client     = @@character_set_client */;
/*!40101 SET character_set_client = utf8 */;
CREATE TABLE `wp_usermeta` (
  `umeta_id` bigint(20) unsigned NOT NULL AUTO_INCREMENT,
  `user_id` bigint(20) unsigned NOT NULL DEFAULT '0',
  `meta_key` varchar(255) DEFAULT NULL,
  `meta_value` longtext,
  PRIMARY KEY (`umeta_id`),
  KEY `user_id` (`user_id`),
  KEY `meta_key` (`meta_key`(191))
) ENGINE=InnoDB AUTO_INCREMENT=1331 DEFAULT CHARSET=utf8;
/*!40101 SET character_set_client = @saved_cs_client */;
 
DROP TABLE IF EXISTS `wp_users`;
/*!40101 SET @saved_cs_client     = @@character_set_client */;
/*!40101 SET character_set_client = utf8 */;
CREATE TABLE `wp_users` (
  `ID` bigint(20) unsigned NOT NULL AUTO_INCREMENT,
  `user_login` varchar(60) NOT NULL DEFAULT '',
  `user_pass` varchar(255) NOT NULL DEFAULT '',
  `user_nicename` varchar(50) NOT NULL DEFAULT '',
  `user_email` varchar(100) NOT NULL DEFAULT '',
  `user_url` varchar(100) NOT NULL DEFAULT '',
  `user_registered` datetime NOT NULL DEFAULT '0000-00-00 00:00:00',
  `user_activation_key` varchar(255) NOT NULL DEFAULT '',
  `user_status` int(11) NOT NULL DEFAULT '0',
  `display_name` varchar(250) NOT NULL DEFAULT '',
  PRIMARY KEY (`ID`),
  KEY `user_login_key` (`user_login`),
  KEY `user_nicename` (`user_nicename`),
  KEY `user_email` (`user_email`)
) ENGINE=InnoDB AUTO_INCREMENT=93 DEFAULT CHARSET=utf8;
/*!40101 SET character_set_client = @saved_cs_client */;

4. 删除表数据(ALTER TABLE XXXXX DISCARD TABLESPACE)

此语句是删除ibd数据文件,只保留frm表结构。

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ALTER TABLE `wp_commentmeta` DISCARD TABLESPACE;
ALTER TABLE `wp_comments` DISCARD TABLESPACE;
ALTER TABLE `wp_links` DISCARD TABLESPACE;
ALTER TABLE `wp_options` DISCARD TABLESPACE;
ALTER TABLE `wp_postmeta` DISCARD TABLESPACE;
ALTER TABLE `wp_posts` DISCARD TABLESPACE;
ALTER TABLE `wp_term_relationships` DISCARD TABLESPACE;
ALTER TABLE `wp_term_taxonomy` DISCARD TABLESPACE;
ALTER TABLE `wp_termmeta` DISCARD TABLESPACE;
ALTER TABLE `wp_terms` DISCARD TABLESPACE;
ALTER TABLE `wp_usermeta` DISCARD TABLESPACE;
ALTER TABLE `wp_users` DISCARD TABLESPACE;

5. 还原ibd

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mv wp_commentmeta.ibd_bak wp_commentmeta.ibd
mv wp_comments.ibd_bak wp_comments.ibd
mv wp_links.ibd_bak wp_links.ibd
mv wp_options.ibd_bak wp_options.ibd
mv wp_postmeta.ibd_bak wp_postmeta.ibd
mv wp_posts.ibd_bak wp_posts.ibd
mv wp_term_relationships.ibd_bak wp_term_relationships.ibd
mv wp_term_taxonomy.ibd_bak wp_term_taxonomy.ibd
mv wp_termmeta.ibd_bak wp_termmeta.ibd
mv wp_terms.ibd_bak wp_terms.ibd
mv wp_usermeta.ibd_bak wp_usermeta.ibd
mv wp_users.ibd_bak wp_users.ibd

6. 导入数据(ALTER TABLE XXXXX IMPORT TABLESPACE)

此语句是导入ibd中的数据。

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ALTER TABLE `wp_commentmeta` IMPORT TABLESPACE;
ALTER TABLE `wp_comments` IMPORT TABLESPACE;
ALTER TABLE `wp_links` IMPORT TABLESPACE;
ALTER TABLE `wp_options` IMPORT TABLESPACE;
ALTER TABLE `wp_postmeta` IMPORT TABLESPACE;
ALTER TABLE `wp_posts` IMPORT TABLESPACE;
ALTER TABLE `wp_term_relationships` IMPORT TABLESPACE;
ALTER TABLE `wp_term_taxonomy` IMPORT TABLESPACE;
ALTER TABLE `wp_termmeta` IMPORT TABLESPACE;
ALTER TABLE `wp_terms` IMPORT TABLESPACE;
ALTER TABLE `wp_usermeta` IMPORT TABLESPACE;
ALTER TABLE `wp_users` IMPORT TABLESPACE;

7. 检查数据

检查select是否能正常查回,内容是否有乱码之类的。

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SELECT * FROM  `wp_commentmeta`;
SELECT * FROM  `wp_comments`;
SELECT * FROM  `wp_links`;
SELECT * FROM  `wp_options`;
SELECT * FROM  `wp_postmeta`;
SELECT * FROM  `wp_posts`;
SELECT * FROM  `wp_term_relationships`;
SELECT * FROM  `wp_term_taxonomy`;
SELECT * FROM  `wp_termmeta`;
SELECT * FROM  `wp_terms`;
SELECT * FROM  `wp_usermeta`;
SELECT * FROM  `wp_users`;

8. 注意事项

注意文件权限和拥有者,如果是root用户拥有的话,也是不行的呢。

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[root@MyServer laycher]# ll
 
total 31344
 
-rw-rw---- 1 mysql mysql 65 DEC 9 2016 db.opt
 
-rw-rw---- 1 mysql mysql 8688 Jul 5 16:49 wp_commentmeta.frm
 
-rw-rw---- 1 mysql mysql 9437184 Jul 5 16:52 wp_commentmeta.ibd
 
-rw-rw---- 1 mysql mysql 13494 Jul 5 16:49 wp_comments.frm
 
-rw-rw---- 1 mysql mysql 10485760 Jul 5 16:52 wp_comments.ibd
 
-rw-rw---- 1 mysql mysql 13176 Jul 5 16:49 wp_links.frm
 
-rw-rw---- 1 mysql mysql 114688 Jul 5 16:52 wp_links.ibd
 
-rw-rw---- 1 mysql mysql 8698 Jul 5 16:49 wp_options.frm
 
-rw-rw---- 1 mysql mysql 7340032 Jul 5 16:52 wp_options.ibd
 
-rw-rw---- 1 mysql mysql 8682 Jul 5 16:49 wp_postmeta.frm
 
-rw-rw---- 1 mysql mysql 327680 Jul 5 16:52 wp_postmeta.ibd
 
-rw-rw---- 1 mysql mysql 9588 Jul 5 16:49 wp_posts.frm
 
-rw-rw---- 1 mysql mysql 3145728 Jul 5 16:52 wp_posts.ibd
 
-rw-rw---- 1 mysql mysql 8682 Jul 5 16:49 wp_termmeta.frm
 
-rw-rw---- 1 mysql mysql 131072 Jul 5 16:52 wp_termmeta.ibd
 
-rw-rw---- 1 mysql mysql 8666 Jul 5 16:49 wp_term_relationships.frm
 
-rw-rw---- 1 mysql mysql 163840 Jul 5 16:52 wp_term_relationships.ibd
 
-rw-rw---- 1 mysql mysql 8668 Jul 5 16:49 wp_terms.frm
 
-rw-rw---- 1 mysql mysql 131072 Jul 5 16:52 wp_terms.ibd
 
-rw-rw---- 1 mysql mysql 8768 Jul 5 16:49 wp_term_taxonomy.frm
 
-rw-rw---- 1 mysql mysql 131072 Jul 5 16:52 wp_term_taxonomy.ibd
 
-rw-rw---- 1 mysql mysql 8684 Jul 5 16:49 wp_usermeta.frm
 
-rw-rw---- 1 mysql mysql 294912 Jul 5 16:52 wp_usermeta.ibd
 
-rw-rw---- 1 mysql mysql 13064 Jul 5 16:49 wp_users.frm
 
-rw-rw---- 1 mysql mysql 147456 Jul 5 16:52 wp_users.ibd

其他说明:

此方法对我这正常,但是如果恢复不成功,请研究使用其他方法,此方法仅供参考。

通过此次事件,一定要注意备份的及时性啊!我是有备份插件,原先用的好好的,这半年多不知道为什么一直没有发邮件过来,我下次再研究研究。

(由于本人惫懒,文章分多天写完,所以中途有时间错乱,请见谅。)

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