Best Patching Practices
===================
manage your central inventory and local inventory
Managing your inventory.xml file
Regularly Path your system
Patch storage ($ORACLE_HOME/.patch_storage)
Inventory backups before patching
GI and OH backup before patching
Use opatchauto (if necessary)

GI Home patching:
DB Home patching:
Datapatch / DB Patching

Troubleshooting:
==============
Use debug option to get extensive logging
missing Patch Storage
Patch staging location permission issue
Patch node properly unzipped / downloaded
GI Home is not properly unlocked
Cluster is not in rolling upgrade mode
datapatch hangs
PDBs are not in opened mode

Interview Questions:
1. What is GI patching prepatch and post commands patch will do?
2. When you are running post patch it is complaining that prepatch is not ran, What you will do?
3. After patching last node is it saying patch level is mismatch even though same patches are applied on all nodes. What will do?
4. Can I patch DB home without patching GI home?
5. Can I patch mulptile oracle home parallely? Or can I run GI and DB home patch parallely
6. Can I run datapatch parallelly?


#19c #GI #Patching #Datapatch #DatabasePatching #GIPatching #Database #Exadata #RAC #ASM #Oracle

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