问题始于Amazon EC2微型实例（1 GB ram），运行Wordpress网站。
我在互联网上尝试了几种解决方案但未能解决问题。
这是我的MySQL错误日志：
160503 19:49:22 [Note] /usr/libexec/mysql55/mysqld (mysqld 5.5.46) starting as process 24829 ...
160503 19:49:22 [Note] Plugin 'FEDERATED' is disabled.
160503 19:49:22 InnoDB: The InnoDB memory heap is disabled
160503 19:49:22 InnoDB: Mutexes and rw_locks use GCC atomic builtins
160503 19:49:22 InnoDB: Compressed tables use zlib 1.2.8
160503 19:49:22 InnoDB: Using Linux native AIO
160503 19:49:25 InnoDB: Initializing buffer pool, size = 128.0M
InnoDB: mmap(137363456 bytes) failed; errno 12
160503 19:49:25 InnoDB: Completed initialization of buffer pool
160503 19:49:25 InnoDB: Fatal error: cannot allocate memory for the buffer pool
160503 19:49:25 [ERROR] Plugin 'InnoDB' init function returned error.
160503 19:49:25 [ERROR] Plugin 'InnoDB' registration as a STORAGE ENGINE failed.
160503 19:49:25 [ERROR] Unknown/unsupported storage engine: InnoDB
160503 19:49:25 [ERROR] Aborting
160503 19:49:27 [Note] /usr/libexec/mysql55/mysqld: Shutdown complete
160503 19:49:29 mysqld_safe mysqld from pid file /var/run/mysqld/mysqld.pid ended
错误表明我的服务器没有足够的内存。
错误日志与此类似：Amazon EC2, mysql aborting start because InnoDB: mmap (x bytes) failed; errno 12
我尝试创建交换文件，重新启动了mysql服务器，结果是它只花了2~分钟才崩溃。
我决定用4 GB RAM创建一个中型实例。我启动服务器，点击4~5页后，MySQL数据库崩溃的方式相同，但错误相同。
最后一次Wordpress（4.5.1）更新更改了数据库，不确定它是否可能相关...
有什么建议吗？