slave机器上遇到的问题：
090717 1:02:59 [ERROR] Error reading packet from server: Out of memory (Needed 136 bytes) ( server_errno=5)
090717 1:02:59 [ERROR] Stopping slave I/O thread due to out-of-memory error from master
090717 1:02:59 [Note] Slave I/O thread exiting, read up to log 'mysql-bin.000067', position 585582385
mysql> show slave status\G;
看到Slave_IO_Running: NO
自己做了如下操作：
mysql> start slave;
slave便恢复正常了
过了几天以后，发现在主数据库上会出现ERROR 5 (HY000): Out of memory的情况，slave的问题应该是主数据库引起的
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