I tune Mysql:key_buffer=64M,table_cache=256,sort_buffer=4M,record_buffer=1M,max_connections=200 I have RAM 516M,CPU 651MHz,many table,many connect from client. I use MySQL 3.23.25. I have problem . In system have zombie process which happen from perl script on apache server( example: index.pl(defunct) ). (perl script connect Mysql) It happen just only one second.I would like to know the cause of this mistake, can you tell me?