Mysql添加索引导致超时

Question

当使用 alter table 向超过 20m 行的表添加索引时，一段时间后我与 mysql 断开连接。我使用的是 mysql 5.6，这是我得到的日志文件:

  END OF INNODB MONITOR OUTPUT
    ============================
    InnoDB: ###### Diagnostic info printed to the standard error stream
    InnoDB: Error: semaphore wait has lasted > 600 seconds
    InnoDB: We intentionally crash the server, because it appears to be hung.
    2014-08-31 21:52:17 890  InnoDB: Assertion failure in thread 2192 in file srv0srv.cc line 1748
    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.

Answer 1

我通过更改 cfg 文件“my”修复了这个问题。我将 inno db 缓冲区更改为 1500mb，现在一切都很好。

希望对其他人有帮助。