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【MySQL】mysqldump备份失败与解决方案合集

原创 作者:神谕丶 时间:2018-01-30 17:34:21 0 删除 编辑
〇 mysqldump: Error: Query execution was interrupted, maximum statement execution time exceeded when trying to dump tablespaces
〇 mysqldump: Error 3024: Query execution was interrupted, maximum statement execution time exceeded when dumping table `$tb_name` at row: xxxx

版本:
MySQL 5.7.8+
原因:
max_execution_time过小
处理思路:
① 通过hints,增大N值(文档说,在hints用法中,将N改为0为无限制,但我测下来不生效,可设置成一个较大值如999999解决)
SELECT /*+ MAX_EXECUTION_TIME(N) */ * FROM t1 LIMIT 100000;
② 修改max_execution_time值,将该值设置为较大一个值,或设置为0(不限制)
附录:
该参数5.7.8被添加,单位为ms,动态参数,默认为0,设置为0时意味着SELECT超时不被设置(不限制超时时间)。不作用于存储过程中的SELECT语句,并且只作用于只读的SELECT,如INSERT ... SELECT ... 是不被作用的。
for more information:
http://blog.itpub.net/29773961/viewspace-2150443/



〇 mysqldump: Couldnt execute SHOW FIELDS FROM `$view_name`: View $db_name.$view_name references invalid table(s) or column(s) or function(s) or definer/invoker of view lack rights to use them (1356)

原因:
该view引用了无效的表,列,函数或者定义者。
处理思路:
可以根据报错信息,进入db,执行SHOW CREATE VIEW $view_name\G,查看该view的定义,逐一检查该view的基表,列,或相关函数与用户是否具有相关权限。考虑重建或删除视图。


〇 mysqldump: Couldnt execute show create table `$view_name`: Illegal mix of collations for operation UNION (1271)

原因:

创建view时,使用UNION时存在非法的排序规则组合。
处理思路:
检查该视图定义,检查字符集,考虑重建或删除视图。


mysqldump: Couldnt execute SHOW FIELDS FROM `$view_name`: The user specified as a definer ($user@$host) does not exist (1449)
〇 mysqldump: Couldnt execute show table status like $view_name: SELECT command denied to user @% for column $col_name in table $tb_name (1143)

原因:
该视图的定义者$user@$host不存在。
处理思路:
检查mysql.user表,确认用户是否存在,考虑重建或删除视图。


〇 Error: Couldnt read status information for table Income_config ()mysqldump: Couldnt execute show create table `Tser_table`: Table $db_name.test_table doesnt exist (1146)
〇 mysqldump: Got error: 1049: Unknown database $db_name when selecting the database

原因一:
从lower_case_table_names的0设置成1,导致部分原来含有大写字母的库表“找不到”。
处理思路:
将lower_case_table_names设置回0。
若有必须将lower_case_table_names设置为1,需先设置为0,并将含有大写字母的库表改成小写,再设置为1。

原因二(MySQL 5.5及以下版本可能出现):
表损坏导致该表找不到(InnoDB)。frm和ibd文件都在,但无法SHOW CREATE TABLE xxx\G
error log一则:
  1. 170820 17:43:17 [Note] Event Scheduler: scheduler thread started with id 1
  2. 170820 17:44:48 InnoDB: error: space object of table '$db_name/$tb_name',
  3. InnoDB: space id 4335 did not exist in memory. Retrying an open.
  4. 170820 17:44:48 InnoDB: Error: tablespace id and flags in file './$db_name/$tb_name.ibd' are 0 and 0, but in the InnoDB
  5. InnoDB: data dictionary they are 4335 and 0.
  6. InnoDB: Have you moved InnoDB .ibd files around without using the
  7. InnoDB: commands DISCARD TABLESPACE and IMPORT TABLESPACE?
  8. InnoDB: Please refer to
  9. InnoDB: http://dev.mysql.com/doc/refman/5.5/en/innodb-troubleshooting-datadict.html
  10. InnoDB: for how to resolve the issue.
  11. 170820 17:44:48 InnoDB: cannot calculate statistics for table $db_name/$tb_name
  12. InnoDB: because the .ibd file is missing. For help, please refer to
  13. InnoDB: http://dev.mysql.com/doc/refman/5.5/en/innodb-troubleshooting.html
  14. 170820 17:44:48 [ERROR] MySQL is trying to open a table handle but the .ibd file for
  15. table $db_name/$tb_name does not exist.
  16. Have you deleted the .ibd file from the database directory under
  17. the MySQL datadir, or have you used DISCARD TABLESPACE?
  18. See http://dev.mysql.com/doc/refman/5.5/en/innodb-troubleshooting.html
  19. how you can resolve the problem.
处理思路:
从完整备份+binlog还原,对于有主或从的实例,可通过物理备份还原。


〇 mysqldump: Error 2020: Got packet bigger than max_allowed_packet bytes when dumping table `$tb_name` at row: xxxx

原因:
默认的max_allowed_packet过小
处理思路:
在mysqldump时增加max_allowed_packet的大小,如mysqldump --max-allowed-packet=268435456


〇 mysqldump: Error 1412: Table definition has changed, please retry transaction when dumping table `$tb_name` at row: 0

原因:
在备份该表时,表定义被修改。FLUSH TABLE WITH READ LOCK只保证数据一致性,并不保证schema不被修改。
处理思路:
备份时期不做DDL操作。
复现一:
  1. ① session1> CREATE TABLE a (id int) ENGINE=InnoDB;
  2. ② session2> START TRANSACTION WITH CONSISTENT SNAPSHOT;
  3. ③ session1> ALTER TABLE a ADD COLUMN name varchar(32);
  4. ④ session2> SELECT * FROM a;
  5. ERROR 1412 (HY000): Table definition has changed, please retry transaction
p.s. 如果③和④调换顺序,则ALTER TABLE无法成功,则会等待MDL。
复现二:
  1. ① session1> START TRANSACTION WITH CONSISTENT SNAPSHOT;
  2. ② session2> CREATE TABLE b (id int) ENGINE=InnoDB;
  3. ③ session1> SELECT * FROM b;
  4. ERROR 1412 (HY000): Table definition has changed, please retry transaction


〇 mysqldump: Couldnt execute show create table `$tb_name`: Unable to open underlying table which is differently defined or of non-MyISAM type or doesnt exist (1168)

原因:
出现在表引擎为MERGE时,备份到该表时,发现该表定义存在问题。可能merge的表不存在,或者该表合并的基表包含非MyISAM引擎的表。
处理思路:
删除或者重建该MERGE表。
复现一(merge表中定义包含了非MyISAM表):
  1. CREATE TABLE t1(id int) ENGINE=InnoDB;
  2. CREATE TABLE t2(id int) ENGINE=MyISAM;
  3. CREATE TABLE merge_t(id int)ENGINE=MERGE UNION=(t1, t2);
  4. SELECT * FROM merge_t;
  5. ERROR 1168 (HY000): Unable to open underlying table which is differently defined or of non-MyISAM type or doesn't exist
复现二(表不存在):
  1. CREATE TABLE t1(id int) ENGINE=MyISAM;
  2. CREATE TABLE t2(id int) ENGINE=MyISAM;
  3. CREATE TABLE merge_t(id int)ENGINE=MERGE UNION=(t1, t2);
  4. SELECT * FROM merge_t;
  5. Empty set (0.00 sec)    -- 正常返回
  6. DROP TABLE t1;
  7. SELECT * FROM merge_t;
  8. ERROR 1168 (HY000): Unable to open underlying table which is differently defined or of non-MyISAM type or doesn't exist
附录:
通过check table merge_t可以检查是哪张表有问题,如此处是t1:
  1. [15:20:12] root@localhost [test]> check table merge_t\G
  2. *************************** 1. row ***************************
  3.   Table: test.merge_t
  4.      Op: check
  5. Msg_type: Error
  6. Msg_text: Table 'test.t1' is differently defined or of non-MyISAM type or doesn't exist
  7. *************************** 2. row ***************************
  8.   Table: test.merge_t
  9.      Op: check
  10. Msg_type: Error
  11. Msg_text: Unable to open underlying table which is differently defined or of non-MyISAM type or doesn't exist
  12. *************************** 3. row ***************************
  13.   Table: test.merge_t
  14.      Op: check
  15. Msg_type: error
  16. Msg_text: Corrupt
  17. 3 rows in set (0.00 sec)
通过cat表MGR定义结构文件可以检查MERGE表的基表:
  1. [root@host test]# pwd
  2. /data/mysql-data/mysql57/data/test
  3. [root@host test]# cat merge_t.MRG
  4. t1
  5. t2


〇 mysqldump: Couldnt execute show create table `$tb_name`: Table ./$db_name/$tb_name is marked as crashed and last (automatic?) repair failed (144)
〇 mysqldump: Couldnt execute show create table `$tb_name`: Table ./$db_name/$tb_name is marked as crashed and should be repaired (145)
〇 mysqldump: Error 1194: Table throne_tower is marked as crashed and should be repaired when dumping table `$tb_name` at row: xxxxx

原因:
mysqldump在拉取表定义时报错,表损坏。
处理思路:
该损坏发生在非事务表如MyISAM,通过mysqlcheck或者repair table修复即可。

〇 mysqldump: Couldnt execute SHOW FUNCTION STATUS WHERE Db = $db_name: Cannot load from mysql.$tb_name. The table is probably corrupted (1728)

原因:
字典表不正确,可能是表本身损坏,也有可能是导入了其他版本的mysql schema盖掉了字典表。
处理思路:
repair table修复,若仍无用,则可以尝试mysql_upgrade来修复,或找到对应版本的mysql_system_tables_fix.sql来导入。

〇 mysqldump: Couldnt execute show events: Cannot proceed because system tables used by Event Scheduler were found damaged at server start (1577)

原因:
字典表不正确,极大可能是导入了其他版本的mysql schema盖掉了字典表。
处理思路:
尝试mysql_upgrade来修复,或找到对应版本的mysql_system_tables_fix.sql来导入。该报错可能在upgrade操作之后重启实例。


〇 mysqldump: Error: Got error 28 from storage engine when trying to dump tablespaces
mysqldump: Couldnt execute show fields from `$tb_name`: Got error 28 from storage engine (1030)

原因:
@@tmpdir满了。
处理思路:
清除@@tmpdir,可以通过SELECT @@tmpdir;检查具体目录。


〇 mysqldump: Lost connection to MySQL server during query (2013)
ERROR 2002 (HY000): Can't connect to local MySQL server through socket '@@socket' (111)

原因:
mysqldump执行过程中mysqld被关闭。
处理思路:
检查mysqld被关闭的原因,一般常见原因是发生OOM。


〇 mysqldump: Couldn't execute 'SHOW SLAVE STATUS': Access denied; you need (at least one of) the SUPER, REPLICATION CLIENT privilege(s) for this operation (1227)

原因:
mysqldump加了--dump-slave参数,缺少SUPER或REPLICATION CLIENT来执行SHOW SLAVE STATUS。
处理思路:
检查mysqldump的用户权限。


〇 mysqldump: Couldn't execute 'STOP SLAVE SQL_THREAD': Access denied for user 'dump'@'localhost' (using password: YES) (1045)

原因:
mysqldump加了--dump-slave参数,缺少SUPER权限使用STOP SLAVE SQL_THREAD。
处理思路:
检查mysqldump的用户权限。




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