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MySQL 启动失败

tag-icon • tag-icon mysql data-recovery innodb
MySQL 启动失败

检查日志文件后，我发现一些数据库有错误。

2017-05-16 08:52:48 7fc0cb8abb00  InnoDB: Assertion failure in thread 140466025315072 in file ha_innodb.cc line 21990
InnoDB: We intentionally generate a memory trap.
InnoDB: Submit a detailed bug report to http://bugs.mysql.com.
InnoDB: If you get repeated assertion failures or crashes, even
InnoDB: immediately after the mysqld startup, there may be
InnoDB: corruption in the InnoDB tablespace. Please refer to
InnoDB: http://dev.mysql.com/doc/refman/5.6/en/forcing-innodb-recovery.html
InnoDB: about forcing recovery.
170516  8:52:48 [ERROR] mysqld got signal 6 ;
This could be because you hit a bug. It is also possible that this binary
or one of the libraries it was linked against is corrupt, improperly built,
or misconfigured. This error can also be caused by malfunctioning hardware.

To report this bug, see https://mariadb.com/kb/en/reporting-bugs

We will try our best to scrape up some info that will hopefully help
diagnose the problem, but since we have already crashed,
something is definitely wrong and this may fail.

Server version: 10.1.23-MariaDB
key_buffer_size=134217728
read_buffer_size=131072
max_used_connections=8
max_threads=10002
thread_count=8
It is possible that mysqld could use up to
key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 22100835 K  bytes of memory
Hope that's ok; if not, decrease some variables in the equation.

Thread pointer: 0x7fb8d3fd1008
Attempting backtrace. You can use the following information to find out
where mysqld died. If you see no messages after this, something went
terribly wrong...
stack_bottom = 0x7fc0cb8ab0b0 thread_stack 0x48400
2017-05-16  8:52:48 140466025618176 [ERROR] InnoDB:  InnoDB: Unable to allocate memory of size 18446744073709545072.

2017-05-16 08:52:48 7fc0cb8f5b00  InnoDB: Assertion failure in thread 140466025618176 in file ha_innodb.cc line 21990
InnoDB: We intentionally generate a memory trap.
InnoDB: Submit a detailed bug report to http://bugs.mysql.com.
InnoDB: If you get repeated assertion failures or crashes, even
InnoDB: immediately after the mysqld startup, there may be
InnoDB: corruption in the InnoDB tablespace. Please refer to
InnoDB: http://dev.mysql.com/doc/refman/5.6/en/forcing-innodb-recovery.html
InnoDB: about forcing recovery.

InnoDB 恢复设置为 3，但我不明白为什么它要分配那么多内存来恢复数据库！

答案1

我之前遇到过这个问题并关注过本指南解决它：

恢复的步骤。

  1. 停止 mysqld。
  2. 备份 /var/lib/mysql/ib*
  3. 在 /etc/my.cnf 中添加以下行

innodb_force_recovery = 4

  1. 重新启动 mysqld。
  2. 转储所有表：$ mysqldump -A > dump.sql
  3. 删除所有需要恢复的数据库。
  4. 停止 mysqld。
  5. 删除 /var/lib/mysql/ib*
  6. 在 /etc/my.cnf 中注释掉 innodb_force_recovery
  7. 重新启动 mysqld。查看 mysql 错误日志。默认情况下，它应该是 /var/lib/mysql/server/hostname.com.err，以查看它如何创建新的 ib* 文件。
  8. 从转储中恢复数据库：mysql < dump.sql

暗示：如果您想专门针对损坏情况，可以使用一个简单的查询来查找所有 InnoDB 表。

SELECT table_schema, table_name FROM INFORMATION_SCHEMA.TABLES WHERE engine = 'innodb';

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