ora-00600:internalerrorcode,arguments:[KGHLKREM1],[0x8

昨天晚上凌晨12点接到监控短信（dataguard is down），于是登录系统查看原因，首先查看备库的alertlog文件，查看最近的半小时的l

/proc/sys/vm/drop_caches (since Linux 2.6.16)
Writing to this file causes the kernel to drop clean caches, dentries and inodes from memory, causing that memory to become free.

To free pagecache:

* echo 1 > /proc/sys/vm/drop_caches

To free dentries and inodes:

* echo 2 > /proc/sys/vm/drop_caches

To free pagecache, dentries and inodes:

* echo 3 > /proc/sys/vm/drop_caches

As this is a non-destructive operation, and dirty objects are not freeable, the user should run "sync" first in order to make sure all cached objects are freed.

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