Mysql添加索引导致超时

当使用ALTERTABLE向超过2000万行的表中添加索引时，我将在一段时间后从mysql获得相关信息。 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.

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我通过更改cfg文件“my”来修复它。 我把inno db bufeer改为1500mb，现在一切都好了

希望它能帮助别人