Patch utility interface
This is also undocumented feature.As name suggest this utility is used to install patches or to be more precise online patches without shooting down instance ( as you know Oracle now offers online patching ).
This patch utility can be invoked by running oradebug command:
oradebug patch
Here is list of all available options which are self descriptive:
[list|install|remove|disable|enable] <file> <temp>
temp = (disabled at restart
default=perm)
file = (in $ORACLE_HOME/hpatch/)
$ORACLE_HOME/hpatch directory contains shared libraries used by online patching.
$ORACLE_HOME/hpatch/orapatch@.cfg ( configuration file )
Oracle has dummy patch 6198642 which can be used to test online patching.You can see it on Laurent’s blog:
http://laurentschneider.com/wordpress/2007/12/oracle-11g-hot-patching.html
and more on online patching:
http://www.oracle.com/technology/deploy/availability/pdf/oracle-openworld-2007/S291525_NowakDutcher.pdf
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