 |
|
Oracle 11g release 2: ASM Cluster File System Snapshots
Oracle11g release 2Tips by Burleson Consulting
August 11, 2008 |
ASM Cluster File System Snapshots in 11gR2
by Lutz Hartmann, Oracle ACE
With
Oracle 11gR2 ASM it is possible to create up to 63 image copies of
file systems as a point in time capture. These snapshots a read only
and can be used to view a file system as of the point in time in the
past when they were created. The snapshots are persistent across
system restarts and reside in ASM storage in the ACFS files system.
Every time such a file system is created a folder .OFS/snaps is
automatically created.
It is
possible to create snapshots based on a regular interval.
These
snapshots can be used as a backup and to restore files which have
been deleted by mistake.
A
command line tool is available to manage snapshots. Here are the
commands:
advutil
tune
ofsdbg
ofsutil
info
ofsutil
registry
ofsutil
rmfs
ofsutil
size
ofsutil
snap create
ofsutil
snap delete
ofsutil
tune
Oracle
11gR2 uses operating system driver modules ACFS, ADVM, and ACFS
Snapshots which are dynamically loadable.
 |
If you like Oracle tuning, you may enjoy my new book "Oracle
Tuning: The Definitive Reference", over 900 pages
of BC's favorite tuning tips & scripts.
You can buy it direct from the publisher for 30%-off and get
instant access to the code depot of Oracle tuning scripts. |
|
