解决mysqldump备份报错： Couldn't execute 'SHOW FIELDS FROM Unknown err...

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服务器环境：

• [iyunv@localhost mysql]# cat /etc/redhat-release
  CentOS Linux release 7.3.1611 (Core)
  [iyunv@localhost mysql]# uname -a
  Linux localhost.localdomain 3.10.0-514.21.1.el7.x86_64 #1 SMP Thu May 25 17:04:51 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux
  [iyunv@localhost mysql]# CentOS Linux release 7.3.1611 (Core)
  
  
  
  
  

MySQL版本号：
mysql> select version();
+------------+
| version()  |
+------------+
| 5.7.13-log |
+------------+
1 row in set (0.00 sec)

报错具体情况：

• [iyunv@localhost tmp]# mysqldump -uroot -p --default-character-set=utf8  --triggers -R --hex-blob --flush-logs  --events --single-transaction  --master-data=2  --all-databases|gzip >/tmp/134-20170831.sql.gz  
  Enter password:
  mysqldump: Couldn't execute 'SHOW FIELDS FROM `v_product_info`': Unknown error 1356 (1356)
  
  

之前，由于数据库作主要用于测试，数据量不大，所以直接用的是mysqldump备份，没有出过问题。今天根据报错提示，是`v_product_info`这个视图出了问题；
下面排查问题所在：

• mysql> select * from information_schema.tables where TABLE_NAME LIKE '%v_product_info%' AND table_type='view'\G;
  
  mysql> USE POSEIDON;
  
  mysql> SHOW CREATE  VIEW v_product_info\G;
  
• 下面为视图内容：
  CREATE ALGORITHM = UNDEFINED DEFINER = `dev_oheimdall_user`@`%` SQL SECURITY DEFINER VIEW `v_product_info` AS SELECT
      `a`.`id` AS `id`,
      `a`.`product_name` AS `product_name`,
      `a`.`feechannel_name` AS `feechannel_name`,
      `d`.`branch` AS `branch`,
      `a`.`product_city` AS `product_city`,
      `a`.`product_type` AS `product_type`,
      `a`.`mortgage_lend_terms` AS `mortgage_lend_terms`,
      `c`.`sparehouse_require` AS `sparehouse_require`,
      `a`.`lend_time_start` AS `lend_time_start`,
      `a`.`lend_time_end` AS `lend_time_end`,
      `a`.`month_rate_start` AS `month_rate_start`,
      `a`.`month_rate_end` AS `month_rate_end`,
      `a`.`repayment_mode` AS `repayment_mode`,
      `a`.`gmt_create` AS `gmt_create`,
      `a`.`status_name` AS `status_name`,
      `a`.`creater` AS `creater`,
      (
          CASE
          WHEN (
              `a`.`id` = `b`.`product_basic_id`
          ) THEN
              `b`.`credit`
          WHEN (
              `a`.`id` = `c`.`product_basic_id`
          ) THEN
              `c`.`credit_require`
          END
      ) AS `credit`
  FROM
      (
          (
              (
                  `product_basic` `a`
                  LEFT JOIN `product_credit_admit` `b` ON (
                      (
                          `a`.`id` = `b`.`product_basic_id`
                      )
                  )
              )
              LEFT JOIN `product_mortgage_admit` `c` ON (
                  (
                      `a`.`id` = `c`.`product_basic_id`
                  )
              )
          )
          LEFT JOIN `fund_channel` `d` ON (
              (
                  `a`.`feechannel_id` = `d`.`id`
              )
          )
      )
  
  

解决问题办法：

• 处理办法：
  mysql> DESC product_basic;
  ERROR 1146 (42S02): Unknown error 1146
  mysql> DESC product_mortgage_admit;
  ERROR 1146 (42S02): Unknown error 1146
  mysql> DROP VIEW v_product_info;
  Query OK, 0 rows affected (0.10 sec)
  
  

然后再进行备份，发现很快顺利完成。