本文介绍了Oracle启动时报错memory_target需要更大/dev/shm的问题及原因分析，并提供了通过调整/dev/shm大小来解决问题的方法。
Oracle启动报错：memory_target needs larger /dev/shm
现象：
Oracle启动不了，alert日志报下错：
Thu Oct 10 11:10:39 2013
Starting ORACLE instance (normal)
WARNING: You are trying to use the MEMORY_TARGET feature. This feature requires the /dev/shm file system to be mounted for at least 22548578304 bytes. /dev/shm is either not mounted or is mounted with available space less than this size. Please fix this so that MEMORY_TARGET can work as expected. Current available is 18584068096 and used is 13628186624 bytes.
memory_target needs larger /dev/shm
Thu Oct 10 11:11:52 2013
Process m000 died, see its trace file
....
分析：
原因为shm太小，需要加大。
解决方法：
1.# mount -t tmpfs shmfs -o size=21g /dev/shm
要想永久生效，需要修改/etc/fstab：
shmfs /dev/shm tmpfs size=21g 0
现象：
Oracle启动不了，alert日志报下错：
Thu Oct 10 11:10:39 2013
Starting ORACLE instance (normal)
WARNING: You are trying to use the MEMORY_TARGET feature. This feature requires the /dev/shm file system to be mounted for at least 22548578304 bytes. /dev/shm is either not mounted or is mounted with available space less than this size. Please fix this so that MEMORY_TARGET can work as expected. Current available is 18584068096 and used is 13628186624 bytes.
memory_target needs larger /dev/shm
Thu Oct 10 11:11:52 2013
Process m000 died, see its trace file
....
分析：
原因为shm太小，需要加大。
解决方法：
1.# mount -t tmpfs shmfs -o size=21g /dev/shm
要想永久生效，需要修改/etc/fstab：
shmfs /dev/shm tmpfs size=21g 0
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