放了wordpress的主機最近經常掛掉，提示無法連結數據庫，檢查log信息發現是因為內存不足，把InnoDB的buffer pool size改小後似乎好了一些，可今天還是出錯了，log信息如下：
1151210 6:45:23 [Warning] Using unique option prefix myisam-recover instead of myisam-recover-options is deprecated and will be removed in a future release. Please use the full name instead.
2151210 6:45:23 [Note] Plugin 'FEDERATED' is disabled.
3151210 6:45:23 InnoDB: The InnoDB memory heap is disabled
4151210 6:45:23 InnoDB: Mutexes and rw_locks use GCC atomic builtins
5151210 6:45:23 InnoDB: Compressed tables use zlib 1.2.8
6151210 6:45:23 InnoDB: Using Linux native AIO
7151210 6:45:23 InnoDB: Initializing buffer pool, size = 96.0M
8InnoDB: mmap(103022592 bytes) failed; errno 12
9151210 6:45:23 InnoDB: Completed initialization of buffer pool
10151210 6:45:23 InnoDB: Fatal error: cannot allocate memory for the buffer pool
11151210 6:45:23 [ERROR] Plugin 'InnoDB' init function returned error.
12151210 6:45:23 [ERROR] Plugin 'InnoDB' registration as a STORAGE ENGINE failed.
13151210 6:45:23 [ERROR] Unknown/unsupported storage engine: InnoDB
14151210 6:45:23 [ERROR] Aborting
further search了一下，有建議說增加SWAP交換空間來解決。於是查看了本機swap空間情況，發現原來沒有…
好吧，那就增加一個SWAP空間試一段時間看看好了.