11gR2 setup a larger dev shm after ORA 00845 MEMORY TARGET not supported on this system I f you get the following error ORA-00845: MEMORY_TARGET not supported on this system while using 11g and the AMM feature... its time to increase your memory mapped files on /dev/shm. As usually Ive setup my /dev/shm devices at about half (4GB) of physical memory (8GB). Im on a ProLiant DL180G5 and using OEL5.4. So the following was my file system configuration: [root@rac31 ~]# df -h Filesystem Size Used Avail Use% Mounted on /dev/cciss/c0d0p2 267G 25G 228G 10% / /dev/cciss/c0d0p1 99M 12M 82M 13% /boot tmpfs 4.0G 192M 3.8G 5% /dev/shm /dev/emcpowerb1 134G 1.1G 133G 1% /u02/ocfs2 /dev/emcpowerd1 5.0G 298M 4.8G 6% /u02/ocfs2_mirror And my /etc/fstab: [root@rac31 ~]# more /etc/fstab LABEL=/1 / ext3 defaults 1 1 LABEL=/boot1 /boot ext3 defaults 1 2 tmpfs /dev/shm tmpfs defaults 0 0 devpts /dev/pts devpts gid=5,mode=620 0 0 sysfs /sys sysfs defaults 0 0 proc /proc proc defaults 0 0 LABEL=SW-cciss/c0d0p3 ...