Mysql 数据库服务器内存不够用了

原来我以为是8G的，原来是4G内存的机器，准备加内存先， buffersize开到2G就吃不消了，还是因为单表量太大了。

090603 22:11:36  InnoDB: Error: cannot allocate 704512 bytes of
InnoDB: memory with malloc! Total allocated memory
InnoDB: by InnoDB 2258750820 bytes. Operating system errno: 12
InnoDB: Check if you should increase the swap file or
InnoDB: ulimits of your operating system.
InnoDB: On FreeBSD check you have compiled the OS with
InnoDB: a big enough maximum process size.
InnoDB: Note that in most 32-bit computers the process
InnoDB: memory space is limited to 2 GB or 4 GB.
InnoDB: We keep retrying the allocation for 60 seconds...
090603 22:15:07  InnoDB: Error: cannot allocate 1064960 bytes of