4. þ A and B. Opatch (either invoked from the command line or through
P AR T III
Database Control) is the tool to install patches.
ý C and D. C is wrong because the OUI doesn’t install patches—it installs
or upgrades an Oracle Home, which is a much larger operation. D is wrong
because the ADRCI uses the ADR to investigate problems; it doesn’t install
patches to fix them.
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