我使用 MySQL 5.5.23-1~dotdeb.0 (Debian)，这里是 my.cnf 的相关部分
default-storage-engine = innodb
innodb_buffer_pool_size = 3G
innodb_log_file_size = 256M
innodb_thread_concurrency = 8
innodb_flush_method = O_DIRECT
innodb_file_per_table = 1
innodb_flush_log_at_trx_commit = 2
innodb_log_buffer_size = 4M
innodb_additional_mem_pool_size = 20M
问题是，无论我为 innodb_buffer_pool_size 选择什么值（我也尝试过 4G 和 8G 以及 8000M）。我得到以下内容mysql> SHOW global VARIABLES;
| innodb_buffer_pool_size | 134217728
调优入门脚本的结果：
INNODB STATUS
Current InnoDB index space = 621 M
Current InnoDB data space = 3.82 G
Current InnoDB buffer pool free = 0 %
Current innodb_buffer_pool_size = 128 M
Depending …我的从服务器宕机了，mysqld 无法启动。我该怎么办？
下面是错误日志：
2014-09-26 12:51:53 14166 [ERROR] InnoDB: Unable to lock ./ibdata1, error: 11
2014-09-26 12:51:53 14166 [Note] InnoDB: Check that you do not already have another mysqld process using the same InnoDB data or log files.
2014-09-26 12:51:54 14166 [ERROR] InnoDB: Unable to lock ./ibdata1, error: 11
2014-09-26 12:51:54 14166 [Note] InnoDB: Check that you do not already have another mysqld process using the same InnoDB data or log files.
2014-09-26 12:51:55 14166 [ERROR] InnoDB: Unable to lock ./ibdata1, …