Tips for using the OPatch Utility

The best tutorial for Opatch
=====================
http://download.oracle.com/docs/cd/B28359_01/em.111/b31207/oui7_opatch.htm


Brandeis University has published a nice overview on using the Oracle OPatch utility to apply patches to Oracle databases:

https://webserver.brandeis.edu/pages/view/Info/ManagingOracle9iOnUNIX#Oracle_OPatch_Utility

This page contains syntax example for using the OPatch command line utility to apply patches, apply interim patches and viewing a list of patches. It shows the OPatch command invocation:

Or use the wrapper script (unix only) which may be invoked after setting the correct $ORACLE_HOME environment variable

opatch command [options>] [-h[elp]]

where command is one of:

apply

lsinventory

rollback

version

It also lists the patch log file directory:

$ORACLE_HOME/.patch_storage/patch_logfile