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?
Display the Patch inventory
$ORACLE_HOME/OPatch/opatch lsinventory
Display just the patches
$ORACLE_HOME/OPatch/opatch lspatches
From SQL*Plus in version 11
dba_registry_history is a view on registry$history
col action_time for a21 col action for a15 col namespace for a15 col version for a15 col comments for a80 wrap select action_time, action, namespace, version, id, comments from dba_registry_history order by 1;
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...
