關於Linux OS tuning secret for Oracle database or Hadoop

vi /etc/rc.local

 

#For best performance for Oracle ASM

echo deadline > /sys/block/sdb/queue/scheduler

#read ahead into the filesystem buffer every time when there is a read process

blockdev --setra 8192 /dev/sdb

echo never > /sys/kernel/mm/redhat_transparent_hugepage/enabled

echo never > /sys/kernel/mm/redhat_transparent_hugepage/defrag

echo no > /sys/kernel/mm/redhat_transparent_hugepage/khugepaged/defrag

#Increase kernel memory by doubling the default (check your system first!)

#the value of this item will be related to the memory in your system

# sysctl -a | grep min_free : 90112

vm.min_free_kbytes=180224

vm.swappiness=0