Patching
From dbawiki
On bog standard iron, this was a fairly simple procedure. Download the patch, stop the databases and listeners and opatch the ORACLE_HOME.
a word about the different patching terminology;overlay, merge, bundle etc..
Contents
What patches are installed?
From command line
$ORACLE_HOME/OPatch/opatch lspatches
From SQL*Plus in version 11
select action, namespace, version, id, comments from dba_registry_history;
From SQL*Plus in version 12
select extract(sys.dbms_qpatch.get_opatch_list,'//patchDescription|//appliedDate|//patchID') from dual;
Now things are getting more interesting...
